by author by year
Publications

2018

A statistical description of scattering at the quantum level
G. Laricchia, P. Van Reeth, S. E. Fayer, S. J. Brawley, R. Kadokura, A. Loreti and M. Shipman Sci. Rep. (2018)
https://www.nature.com/articles/s41598-018-33425-8.pdf OPEN ACCESS

2017

Resonant scattering of positronium as a quasi-free electron
M. Shipman, S.J. Brawley, L. Sarkadi and G. Laricchia Phys. Rev. A 93 (2017) 032704
http://link.aps.org/doi/10.1103/PhysRevA.95.032704 OPEN ACCESS

2016

High-resolution measurements of e+ + H2O total cross section
A. Loreti, R. Kadokura, S. E. Fayer, A. Kover and G. Laricchia Phys. Rev. Lett. 117 (2016) 253401
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.253401#fulltext

Magnetic field-free measurements of the total cross section for positrons scattering from helium and krypton
S.E. Fayer, A. Loreti, S.L. Andersen, A. Kover and G. Laricchia J. Phys. B 49 (2016) 075202
http://iopscience.iop.org/article/10.1088/0953-4075/49/7/075202/meta OPEN ACCESS

2015

Positronium production and scattering below its break-up threshold
S.J. Brawley, S.E. Fayer, M. Shipman and G. Laricchia Phys. Rev. Lett. 115 (2015) 223201 http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.223201

Moderation and diffusion of positrons in tungsten meshes and foils
A. I. Williams, D. J. Murtagh, S. E. Fayer, S.L. Andersen, J. Chevallier, A. Kover, P. Van Reeth , J.W. Humberston and G. Laricchia J. Appl. Phys. 118 (2015) 105302
http://scitation.aip.org/content/aip/journal/jap/118/10/10.1063/1.4930033

An electrostatic positron beam for atomic and molecular collision experiments
S E Fayer, A Loreti, A Kover, S L Andersen and G Laricchia Journal of Physics: Conference Series 635 (2015) 052070 http://iopscience.iop.org/article/10.1088/1742-6596/635/5/052070/meta

Positronium beam production and scattering at low energies
S E Fayer, S J Brawley, M Shipman, L Sarkadi, and G Laricchia Journal of Physics: Conference Series 635 (2015) 052069 http://iopscience.iop.org/article/10.1088/1742-6596/635/5/052069/meta

Absolute Differential Positronium-Formation Cross Sections
M. Shipman, S. Armitage, J. Beale, S.J. Brawley, S.E. Fayer, A.J. Garner, D.E. Leslie, P. Van Reeth, and G. Laricchia Phys. Rev. Lett. 115 (2015) 033401
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.033401

2014

An electrostatic brightness-enhanced timed positron beam for atomic collision experiments
A. Kover, A.I. Williams, D.J. Murtagh, S.E. Fayer and G. Laricchia Meas. Sci. Technol. 25 (2014) 075013
http://iopscience.iop.org/0957-0233/25/7/075013?fromSearchPage=true

Collimated positronium production from gases
M. Shipman, S.J. Brawley, L. Sarkadi and G. Laricchia Eur. Phys. J. D 68 (2014) 66
http://dx.doi.org/10.1140/epjd/e2014-40791-5 OPEN ACCESS

Ionization cross-sections for positron collisions with N2
D.A. Cooke, D.J. Murtagh, and G. Laricchia Eur. Phys. J. D 68 (2014) 75
http://dx.doi.org/10.1140/epjd/e2014-40784-4 OPEN ACCESS

2013

Experimental Aspects of Ionization Studies by Positron and Positronium Impact
G. Laricchia, D.A. Cooke, A. Kover and S.J. Brawley in "Fragmentation Processes Topics in Atomic and Molecular Physics" Colm T. Whelan (Ed.), Cambridge University Press, (2013) 116
http://ebooks.cambridge.org/chapter.jsf?bid=CBO9781139017572&cid=CBO9781139017572A033

2012

Electron-like and resonant scattering of positronium
S. Brawley, A.I. Williams, M. Shipman and G. Laricchia J. Phys. Conf. Series 388 (2012) 012018
http://iopscience.iop.org/1742-6596/388/1/012018?fromSearchPage=true
doi:10.1088/1742-6596/388/7/072031

Positronium formation with excitation
Cooke DA, Murtagh DJ, Fransman P, Laricchia G J. Phys. Conf. Series 388 (2012) 072025
http://iopscience.iop.org/article/10.1088/1742-6596/388/7/072025/meta
doi:10.1088/1742-6596/388/7/072025

Positronium Collision Physics
G. Laricchia and H.R.J. Walters La Rivista del Nuovo Cimento 35 (2012) 305
http://en.sif.it/journals/ncr/econtents/2012/035/06
DOI: 10.1393/ncr/i2012-10077-6

Production of Collimated Positronium by Positron Scattering from CO2, N2 and Xe
M. Shipman, S. Brawley, D.E. Leslie, S. Armitage, and G. Laricchia Eur. Phys. J. D 66 (2012) 96
http://link.springer.com/article/10.1140%2Fepjd%2Fe2012-20753-9
DOI: 10.1140/epjd/e2012-20753-9

Positronium Formation and Scattering from Biologically Relevant Molecules
G. Laricchia, D.A. Cooke, and S.J. Brawley in "Radiation Damage in Biomolecular Systems, Biological and Medical Physics, Biomedical Engineering" (G. Garcia and M.C. Fuss, eds.), Springer, 2012, Part 1, 143-153
http://www.springerlink.com/content/l84242830r2kj694/
DOI: 10.1007/978-94-007-2564-5 8

2010

Resonant Scattering of Positronium in Collision with CO2
S. J. Brawley, A. I. Williams, M. Shipman, and G. Laricchia Phys Rev Letts 105 (2010) 263401
http://prl.aps.org/abstract/PRL/v105/i26/e263401
DOI: 10.1103/PhysRevLett.105.263401

Electron-Like Scattering of Positronium
S. J. Brawley, S. Armitage, J. Beale, D. E. Leslie, A. I. Williams, and G. Laricchia Science 330 (2010) 789
Abstract Reprint Full Text
DOI: 10.1126/science.1192322

Simultaneous Ionization and Excitation of Molecules by Positron Impact
D. A. Cooke, D. J. Murtagh and G. Laricchia Phys Rev Letts 104 (2010) 073201
http://prl.aps.org/pdf/PRL/v104/i7/e073201
DOI: 10.1103/PhysRevLett.104.073201

Fragmentation in positronium collisions with atoms
S. Brawley and G. Laricchia J. Phys. Conf. Series 199 (2010) 012001
http://iopscience.iop.org/1742-6596/199/1/012001/
DOI: 10.1088/1742-6596/199/1/012001

Positronium formation cross-sections for Xe, CO2 and N2
D. A. Cooke, D. J. Murtagh and G. Laricchia J. Phys. Conf. Series 199 (2010) 012006
doi:10.1088/1742-6596/199/1/012006

Differential Ionization Studies by Positron Impact
A. Kover, D.J. Murtagh, A.I. Williams and G. Laricchia J. Phys. Conf. Series 199 (2010) 012020
doi:10.1088/1742-6596/199/1/012020

Progress Towards a Positron Reaction Microscope
A. I. Williams, A. Kover, D. J. Murtagh and G. Laricchia J. Phys. Conf. Series 199 (2010) 012025
doi:10.1088/1742-6596/199/1/012025

2009

Ionization in positron- and positronium-collisions with atoms and molecules
G. Laricchia, S. Brawley, A. Cooke, A. Kover, D.J. Murtagh and A.I. Williams J. Phys. Conf. Series 102 (2009) 012036
http://iopscience.iop.org/1742-6596/194/1/012036/

Excited-state positronium formation from helium, argon and xenon
D.J. Murtagh, D.A. Cooke and G. Laricchia Phys Rev Letts 102 (2009) 133202
http://link.aps.org/abstract/PRL/v102/e133202
DOI: 10.1103/PhysRevLett.102.133202

Ion production by positron impact on H2O
C. Arcidiacono, J. Beale, Z. Pesic, A. Kover and G. Laricchia J. Phys. B: At. Mol. Opt. Phys. 42 (2009) 065205
http://stacks.iop.org/0953-4075/42/065205.

2008

Ionizing Collisions by Positrons and Positronium Impact on the Inert Atoms
G. Laricchia, S. Armitage, A. Kover and D.J. Murtagh Adv. At. Mol. Opt. Phys.56 (2008) 1-47
ISBN-13: 978-0-12-374290-2

Fragmentation of positronium in collision with xenon
S.J. Brawley, J. Beale, S. Armitage, D.E. Leslie, A. Kover and G. Laricchia Nucl. Instr. Meth. B 226 (2008) 497-501
http://dx.doi.org/10.1016/j.nimb.2007.12.031

Direct non-dissociative and dissociative ionization of CO2 by positron impact
D.A. Cooke, D.J. Murtagh, A. Kover and G. Laricchia Nucl. Instr. Meth. B 226 (2008) 466-470
http://dx.doi.org/10.1016/j.nimb.2007.12.026

2007

Double-differential ionization cross-section for H2O
C. Arcidiacono, A. Kover, Z. D. Pešic, J. Beale and G. Laricchia Radiation Physics and Chemistry (2007) 431-435

2006

On the XIIIth International Workshop on low-energy e+ and Ps physics
M W J Bromley, M A P Lima and G Laricchia Physica Scripta 74 (2006) C37-C45

Positronium- and positron-H2O total cross-sections
J Beale, S Armitage and G Laricchia J Phys B 39 (2006) 1337 Positronium Formation from CO2 and H2O
D. J. Murtagh , C. Arcidiacono, Z. D. Pešic and G. Laricchia Nucl. Instr. Meth. B 247 (2006) 92

Collisions Involving Positronium
S. Armitage, D. E. Leslie, J. Beale and G. Laricchia Nucl. Instr. Meth. B 247 (2006) 98

2005

Energy sharing asymmetries in ionisation by positron impact
C. Arcidiacono, A. Kover and G. Laricchia Phys Rev Letts 95 (2005) 223202

Positron-impact ionization and positronium formation from helium
D.J. Murtagh, M. Szluinska, J. Moxom, P. Van Reeth and G. Laricchia J Phys B 38 (2005) 3857-3866

Production and scattering of a positronium beam
S. Armitage, J. Beale, D. Leslie and G. Laricchia Nucl. Instr. Meth. B 233 (2005) 88

On the energy dependence of the annihilation cross-sections for positrons in collisions with atoms and molecules
P. Van Reeth, G. Laricchia and J. W. Humberston Physica Scripta 71 (2005) C9

Low energy positron induced ionization in He and Ne
M. Szluinska, D. Murtagh and G. Laricchia Nucl. Instr. Meth. B 229 (2005) 51

2004

Differential ionization experiments on positron-atom scattering
M. Szluinska and G. Laricchia Nucl. Instr. Meth. B 221 (2004) 107

Investigation into the energy dependence of the annihilation cross-sections for Ne and Xe below the positronium formation threshold
M. Szluinska and G. Laricchia Nucl. Instr. Meth. B 221 (2004) 100

Positronium induced collisions
G. Laricchia,S. Armitage, D.E. Leslie Nucl. Instr. Meth. B 221 (2004) 60

Differential ionization experiments on positron-atom scattering
A. Kover, C. Arcidiacono and G. Laricchia Nucl. Instr. Meth. B 221 (2004) 56

2003

Positron and positronium interactions with atoms and molecules
G. Laricchia,S. Armitage, D.E. Leslie and P. Van Reeth Radiation Physics and Chemistry 68(2003)21

2002

Production of collimated positronium from molecular nitrogen
D.E. Leslie,S. Armitage and G. Laricchia J Phys B 35 (2002) 4819-4827

Fragmentation of positronium in collision with He atoms
S. Armitage, D.E. Leslie, A.J. Garner and G. Laricchia Physical Review Letters 89 (2002) 173402-1

Empirical scaling of positron- and electron-impact ionization cross sections
M. Szluinska, P. Van Reeth and G. Laricchia, J Phys B 35 (2002) 4059

Total positron-impact ionization and positronium formation from the noble gases
G. Laricchia, P. Van Reeth, M. Szluinska and J. Moxom J Phys B 35 (2002) 2525

Scattering of positrons and positronium by atoms and molecules
G. Laricchia in "The Physics of Electronic and Atomic Collisions" (Rinton Press, New York) (2002) 329

Positronium scattering from atoms and molecules
S. Armitage and G. Laricchia Nucl. Instr. Meth. B 192 (2002) 67

On the normalization of the positron-impact direct ionization cross-section in the noble gases
P. Van Reeth, M. Szluinska and G. Laricchia Nucl. Instr. Meth. B 192 (2002) 220

Electron ejection by positron impact ionization
Kover A; Paludan K; Laricchia G Nucl. Instr. Meth. B 192 (2002) 167

Energy dependence of the total ionization and positronium formation cross-sections in e+ - Xe collisions
M Szluinska, P Van Reeth and G Laricchia Nucl. Instr. Meth. B 192 (2002) 215

Correlations between cross sections and threshold energies for positronium formation and direct ionization
Humberston JW; Van Reeth P; Laricchia G Nucl. Instr. Meth. B 192 (2002) 44

2001

Triply differential ionization cross-section of H2 by 50 eV impact-energy positrons
Kover A; Paludan K; Laricchia G J Phys B 34 (2001) L219-L222

Correlations between ionization cross-sections and threshold energies in electron-, positron- proton- and antiproton-atom collisions
Van Reeth P; Humberston JW; Laricchia G J Phys B 34 (2001) L271-L279

A parallel plate analyser with time focussing
Kover A and Laricchia G Meas. Sci. Technol12 (2001) 1875-1881

On the formation of excited state positronium in vacuum by positron impact on untreated surfaces
Day D, Charlton M, Laricchia G J Phys B 34 (2001) 3617-3628

Correlations between cross-sections and threshold energies for positronium formation and direct ionization
J Humberston, P. Van Reeth and G. Laricchia In “New directions in Antimatter chemistry and Physics” (Kluwer Academic, The Netherlands) (2001) 303

2000

The effect of forward-angle scattering on positronium-gas total cross sections
Garner AJ; Özen A; Laricchia G J Phys B 33 (2000) 1149-1157

Electron-capture-to-the-continuum by positron impact
Kover A, Paludan K, Laricchia GNucl. Instr. Meth. B 171 (2000) 103-105

Rare gas solid moderator for Ps beam at UCL
Özen A, Garner AJ, Laricchia GNucl. Instr. Meth. B 171 (2000) 172-177

Ionization and fragmentation of CCl2F2, CClF3, CF4, and CHF3 by positron impact
Moxom J; Schrader DM; Laricchia G; Xu J; Hulett LDPhysical Review A 6205 (2000) 2708

Correlations between cross sections and threshold energies for positronium formation
Van Reeth P, Humberston JW, Laricchia G, Dunn JTJ Phys B 33 (2000) L669-L676

Atomic and molecular physics with positrons and positronium
G Laricchia and M Charltonin “Positron Beams and their Applications” (World Scientific, Singapore) (2000) 41-96

1999

Positrons and Positronium Collisions
Laricchia G, (1999) "New Directions in Atomic Physics" Whelan et al, eds (Plenum Press, New York) pp 245-250

Double ionization of Noble Gases by Positron Impact
J Moxom, DM Schrader, G Laricchia, Jun Xu and LD Hulett Physical Review A 60 (1999) pp2940-2943

Low energy positron-argon elastic scattering at 30o
H Gao, AJ Garner, J Moxom, G Laricchia and A KoverJ Phys B 32 (1999) L693-696

Collisions involving antiparticles
G Laricchia and M CharltonPhil. Trans. R. Soc. Lond. A 357 (1999) 1259-1277

Fragmentation and ionization of CH3Cl by positron impact
J Moxom, DM Schrader, G Laricchia, LD Hulett, J XuApplied Surface Science149 (1999) 244-247

From positron to positronium scattering
Laricchia G, Garner A J and Paludan K, (1999) in "Supercomputing, Collision Processes and Applications" eds. K L Bell, K A Berrington, D S F Crothers, A Hibbert and K T Taylor (Plenum, New York) pp171-182

1998

An electrostatic beam for positron-gas scattering measurements
Gao H, Garner A J, Moxom J, Laricchia G and Kover Á, Nuc Inst and Methods B 143 (1998) pp184-187

Positronium beam scattering from atoms and molecules
Garner A J, Özen A and Laricchia G, Nuc Inst and Methods B 143 (1998) pp155-161

Positron impact ionisation of atoms
Kara V, Paludan K, Moxom J, Ashley P and Laricchia G, Nuc Inst and Methods B 143 (1998) pp94-99

Triply differential study of positron impact ionization of H2
Kover Á and Laricchia G, Phys Rev Letts 80 (1998) pp5309-5312

Electron ejection from ionising positron-atom collisions
Kövér Á, Laricchia G and Finch R, Nuc Inst and Methods B 143 (1998) pp100-104

On the annihilation of positrons in binary encounters with molecules
Laricchia G and Wilkin C, Nuc Inst and Methods B 143 (1998) pp135-139

Fragmentation and ionization of CH3F by positron and electron impact
Moxom J, Xu J, Laricchia G, Hulett L D, Schrader D M, Kobayashi Y, Somieski B, Lewis T A, Nuc Inst and Methods B 143 (1998) pp112-120

1997

Possible antihydrogen formation in antiproton-positronium reactions: where we've been and where we're going
Charlton M, Hyp Int 109 (1997) pp269-278

Antihydrogen production an d precision experiments - The ATHENA collaboration
Holzscheiter M H, Bendiscioli G, Bertin A, Bollen G, Bruschi M, Cesar C, Charlton M, Corradini M, DePedis D, Doser M, Eades J, Fedele R, Feng X, Galluccio F, Goldman T, Hangst J S, Hayano R, Horvath D, Hughes R J, King N S P, Kirsebom K, Knudsen H, Lagomarsino V, Landua R, Laricchia G, Lewis R A, LodiRizzini E, Macri M, Manuzio G, Marconi U, Masullo M R, Merrison J P, Moller S P, Morgan G L, Nieto M M, Piccinini M, Poggiani R, Rotondi A, Rouleau G, Salvini P, SempriniCesari N, Smith G A, Surko C M, Testera G, Torelli G, Uggerhoj E, Vaccaro V G, Venturelli L, Vitale A, Widmann E, Yamazaki T, Yamazaki Y, Zanello D, Zoccoli A, Hyp Int 109 (1997) pp1-32

Antihydrogen production and precision experiments
Holzscheiter M H, Bendiscioli G, Bertin A, Bollen G, Bruschi M, Cesar C, Charlton M, Corradini M, DePedis D, Doser M, Eades J, Fedele R, Feng X, Galluccio F, Goldman T, Hangst J S, Hayano R, Horvath D, Hughes R J, King N S P, Kirsebom K, Knudsen H, Lagomarsino V, Landua R, Laricchia G, Lewis R A, LodiRizzini E, Macri M, Manuzio G, Marconi U, Masullo M R, Merrison J P, Moller S P, Morgan G L, Nieto M M, Piccinini M, Poggiani R, Rotondi A, Rouleau G, Salvini P, SempriniCesari N, Smith G A, Surko C M, Testera G, Torelli G, Uggerhoj E, Vaccaro V G, Venturelli L, Vitale A, Widmann E, Yamazaki T, Yamazaki Y, Zanello D, Zoccoli A, Nuclear Physics B S56A (1997) pp336-348

Single and double ionization of neon, krypton and xenon by positron impact
Kara V, Paludan K, Moxom J, Ashley P and Laricchia G, J Phys B 30 (1997) pp3933-3949

Of positron scattering and annihilation from molecules
Laricchia G, Materials Science Forum 255 (1997) pp228-232

Semiempirical approach to positron annihilation in molecules
Laricchia G and Wilkin C, Phys Rev Letts 79 (1997) pp2241-2244

Experimental demonstration of hydrogen formation following the interaction of protons with positronium
Merrison J P, Bluhme H, Charlton M, Knudsen H, Poulsen M R, Hyp Int 109 (1997) pp313-321

Hydrogen formation by proton impact on positronium
Merrison J P, Bluhme H, Chevallier J, Deutch B I, Hvelplund P, Jorgensen L V, Knudsen H, Poulsen M R and Charlton M, Phys Rev Letts 78 (1997) pp2728-2731

Threshold and channel-coupling effects in positron elastic scattering from noble gases
Meyerhof W E and Laricchia G, J Phys B 30 (1997) pp2221-2238

Fragmentation of CH3F by positron impact
Moxom J, Xu J, Hulett L D, Schrader D M, Laricchia G and Somieski B, Materials Science Forum 255 (1997) pp272-274

Ionization of rare gases by particle-antiparticle impact
Paludan K, Laricchia G, Ashley P, Kara V, Moxom J, Bluhme H, Knudsen H, Mikkelsen U, Moller SP, Uggerhoj E and Morenzoni E, J Phys B 30 (1997) L581-L587

Stored positrons for antihydrogen production
Surko C M, Greaves R G, Charlton M, Hyp Int 109 (1997) pp181-188

1996

Near-threshold ionization of He and H2 by positron impact
Ashley P, Moxom J and Laricchia G, Phys Rev Lett 77 (1996) 1250-1253

Possibilities for antihydrogen formation by antiproton-positronium collisions
Charlton M, Can J Phys 74 (1996) pp483

Antihydrogen from antiproton positronium collision
Charlton M, Hyp Int 100 (1996) pp55

'Deutch, Bernie Irwin'
Charlton M, Holzscheiter M and Nielson H L, Hyp Int 100 (1996) pp1

Antihydrogen synthesis by collisions between antiprotons and positronium atoms
Charlton M, Laricchia G, Feng X, Hangst J S, Hvelplund P, Knudsen H, Merrison J P, Uggerhoj E, Holzscheiter M H, Hughes R J, Physics of Atomic Nuclei 59 (1996) pp1474-1481

Differential cross-section measurements in positron-argon scattering
Finch R M, Kövér Á, Charlton M and Laricchia G, Can J Phys 74 (1996) pp505

Positron-argon elastic, positronium formation and ionising collisions at 60ş
Finch R M, Kövér Á, Charlton M and Laricchia G, J Phys B 29 (1996) L667

Positronium beam production and positronium scattering from molecular hydrogen
Garner A J and Laricchia G, Can J Phys 74 (1996) pp518-520

Ps beam production and scattering from gaseous targets
Garner A J, Laricchia G and Özen A, J Phys B 29 (1996) pp5961-5968

Collsions of positrons and positronium with atoms and molecules
Laricchia G, in 'The Physics of Electronic and Atomic Collisions', (AIP, New York) 385 (1996)

Of atomic collsions with positrons and positronium
Laricchia G, Hyp Int 100 (1996) pp71-89

Positron scattering on atoms and molecules near the positronium threshold
Laricchia G, Moxom J, Watts M S T, Humberston J W and Meyerhof W E, Can J Phys 74 (1996) 427

Positron scattering on atoms and molecules near the positronium threshold
Meyerhof W E, Laricchia G, Moxom J, Watts M S T and Humberston J W, Can J Phys 74 (1996) pp427-433

Single ionization by positron impact
Moxom J, Ashley P and Laricchia G, Can J Phys 74 (1996) pp367-372

Ionization in collisions between 30-1000 keV antiprotons and atomic-hydrogen
Paludan K, Charlton M, Kirsebom K, Knudsen H, Mikkelsen U, Morenzoni E, Moller S P, Slevin J and Uggerhoj E, Can J Phys 74 (1996) pp490-495

The ORELA positron-scattering program - progress in the first energy-analysis experiments
Schrader D M, Hulett L D, Xu J, Laricchia G, Lewis T A, Horsky T N, Can J Phys 74 (1996) pp497-500

Positronium-argon scattering
Zafar N, Laricchia G, Charlton M and Garner A, Phys Rev Lett 76 (1996) pp1595-1598

1995

Positron dynamics in surface-charged solid argon
Jorgensen L V, Merrison J P, Deutch B I, Charlton M and Jones G O, Phys Rev B 52 (1995) pp12402-12407

Ionization of atomic-hydrogen by 30-1000 kev antiprotons
Knudsen H, Mikkelsen U, Paludan K, Kirsebom K, Moller S P, Uggerhoj E, Slevin J, Charlton M and Morenzoni E, Phys Rev Letts 74 (1995) pp4627-4630

Nondissociative and dissociative ionization of N -2 , CO, CO2 , and CH4 by impact of 50-6000 kev protons and antiprotons
Knudsen H, Mikkelsen U, Paludan K, Kirsebom K, Moller S P, Uggerhoj E, Slevin J, Charlton M and Morenzoni E, J Phys B 28 (1995) pp3569-3592

Positron and positronium collisions
Laricchia G, Nuc Int & Methods in Phys Res B 999 (1995) pp363-367

Ionization of He, Ar and H2 by positron impact at intermediate energies
Moxom J, Laricchia G and Charlton M, J Phys B 28 (1995) pp1331-1347

A gated positron beam incorporating a scattering cell and novel ion extractor
Moxom J, Laricchia G and Charlton M, App Surf Sci 85 (1995) pp118-123

1994

Near-threshold ionization by positron impact
Ashley P, Laricchia G and Charlton M, Hyp Int 89 (1994) 389-394

Antihydrogen Physics
Charlton M, Eades J, Horvath D, Hughes R J and Zimmerman C, Phys Rep 241 (1994) pp65-117

Angular-correlation studies of positron-annihilation in the noble-gases
Coleman P G, Rayner S, Jacobsen F M, Charlton M and West R N, J Phys B 27 (1994) pp981-991

Early experiments with slow positrons in atomic physics
Griffith T C, Hyp Int 89 (1994) pp3-17

Differential ionization studies at forward angles
Kövér Á, Laricchia G and Charlton M, Hyp Int 89 (1994) pp129-131

Doubly differential cross sections for collisions of 100eV positrons and electrons with argon atoms
Kövér Á, Laricchia G and Charlton M, J Phys B 27 (1994) pp2409-2416

Near threshold effects in positron-atom (molecule) scattering
Laricchia G, Moxom J, Charlton M, Kövér Á and Meyerhof W E, Hyp Int 89 (1994) pp209-218

Threshold effects in positron scattering on noble gases
Moxom J, Laricchia G, Charlton M, Kövér Á and Meyerhof W E, Phys Rev A 50 (1994) pp3129-3133

Positronium beam technology
Zafar N, Laricchia G and Charlton M, Hyp Int 89 (1994) pp243-249

Positronium interactions in atomic physics
Zafar N, Laricchia G and Charlton M, Hyp Int 84 (1994) pp355-363

1993

The production of low-energy positrons and positronium
Charlton M and Laricchia G, Hyp Int 76 (1993) pp97-133

Antihydrogen synthesis by the reaction of antiprotons with excited-state positronium atoms
Deutch B I, Charlton M, Holzscheiter M H, Hvelplund P, Jorgensen L V, Knudsen H, Laricchia G, Merrison J P, Poulsen M R, Hyp Int 76 (1993) pp153-161

Positron-impact ionization of atomic-hydrogen
Jones G O, Charlton M, Slevin J, Laricchia G, Kövér Á, Poulsen M R and Chormaic S N, J Phys B 26 (1993) L483-L488

Ionization by positrons and electrons of Ar at zero degrees
Kövér Á, Laricchia G and Charlton M, J Phys B 26 (1993) L575-L580

Ionization of CO2 by positron impact
Laricchia G and Moxom J, Phys Lett A 174 (1993) pp255-257

Positronium beams and surfaces
Laricchia G, NATO Advanced Research Workshop, Advances with Positron Spec of Solids and Surfaces (1993) pp401-418

Near-threshold effects in positron-O2 scattering
Laricchia G, Moxom J and Charlton M, Phys Rev Letts 70 ( 1993) pp3229-3230

Studies of positron moderation in surface charged rare-gas solids
Merrison J P, Charlton M, Deutch B I and Jorgensen L V, Hyp Int 76 (1993) pp305-308

Total ionization cross sections of He, H2 and Ar by positron impact
Moxom J, Laricchia G and Charlton M, J Phys B 26 (1993) L367-L372

Measurement of the positronium formation potential for Ag(100)
Poulsen M R, Charlton M and Laricchia G, J Phys - Condens Matter 5 (1993) pp5209-5214

Positronium formation from silver
Poulsen M R, Charlton M, Deutch B I, Jorgenson L V and Laricchia G, Hyp Int 76 (1993) pp309-317

Crossed-beam measurement of binding-energies of positronium compounds - a preliminary-study
Schrader D M, Laricchia G and Horsky T N, Journal de Physique IV 3 (1993) pp61-67

1992

Positronium formation in the heavier noble gases in the presence of a static electric field
Charlton M, Cullen R A, Raza J and Watts M S T, J Phys B 25 (1992) pp4351-4361

Elastic positron-helium scattering near the positronium formation threshold
Coleman P G, Johnston K A, Cox A M G, Goodyear A and Charlton M, J Phys B 25 (1992) L585-L588

An experiment to measure the radiative lifetime of the 2p state of positronium
Day D J, Laricchia G and Charlton M, Hyp Int 73 (1992) pp223-228

An electrostatic system for investigating positron-atom collisions
Kövér Á, Laricchia G and Charlton M, Materials Science Forum 105-110 (1992) pp1919-1922

Recent advances in the characte rization of a Ps beam
Laricchia G, Zafar N, Charlton M and Griffith T C, Hyp Int 73 (1992) pp133-145

Positronium beam production by positron-gas interactions
Laricchia G and Zafar N, Solid State Phys 28/29 (1992)

Field assisted positron moderation by surface charging of rare-gas solids
Merrison J P, Charlton M, Deutch B I and Jorgensen L V, J Phys-Condensed Matter 4 (1992) L207-L212

Ejected-electron energy spectra in low energy positron-argon collisions
Moxom J, Laricchia G, Charlton M, Jones G O and Kövér Á, J Phys B 25 (1992) L613-L619

Electron-emission spectra in low-energy positron-atom collisions
Moxom J, Laricchia G, Charlton M, Jones G O and Kövér Á, Hyp Int 73 (1992) pp217-22

The new magnetically confined positron beam at UCL
Zafar N, Laricchia G, Charlton M and Griffith T C, Hyp Int 73 (1992) pp213-215

1991

Collision phenomena involving positronium
Charlton M and Laricchia G, Comments At Mol Phys 26 (1991) pp253-267

A new timed slow positron beam
Merrison J P, Charlton M and Laricchia G, Measurement Science and Technology 2 (1991) pp175-177

Thermal-activation of positronium from thin Ag(100) films in backscattering and transmission geometries
Poulsen M R, Charlton M, Chevallier J, Deutch B I, Jorgensen L V and Laricchia G, J Phys - Condens Matter 3 (1991) pp2849-2858

Diagnostics of a positronium beam
Zafar N, Laricchia G, Charlton M and Griffith T C, J Phys B 24 (1991) pp4461-4670

1990

Antihydrogen production in collisions of antiprotons with excited states of positronium
Charlton M, Phys Lett A 143 (1990) pp143-146

The physics of low-energy positron collisions
Charlton M, Physica Scripta 42 (1990) pp164-172

Positron impact phenomena
Charlton M and Laricchia G, J Phys B 23 (1990) pp1045-1078

The effect of laser annealing of thin W(100) films on positron transmission reemission properties
Jacobsen F M, Charlton M, Chevallier J, Deutch B I, Laricchia G, Poulsen M R, J Appl Phys 67 (1990) pp575-577

Improvement of rare-gas solid moderators by using conical geometry
Khatri R, Charlton M, Sferlazzo P, Lynn K G, Mills A P and Roellig L O, Appl Phys Letts 57 (1990) pp2374-2376

Single ionization of H -2 , He, Ne and Ar by positron impact
Knudsen H, Brunnielsen L, Charlton M and Poulsen M R, J Phys B 23 (1990) pp3955-3976

1989

Double ionization of noble gases by positron and electron impact
Charlton M, Brun-Nielsen L, Deutch B I, Hvelplund P, Jacobsen F M, Knudsen H, Laricchia G and Poulsen M R, J Phys B 22 (1989) pp2779-2788

Free positron-annihilation in gases under the influence of a static electric-field
Davies S A, Charlton M and Griffith T C, J Phys B 22 (1989) pp327-340

Antihydrogen by positronium-antiproton collisions
Deutch B I, Andersen L H, Hvelplund P, Jacobsen F M, Knudsen H, Holzscheiter M H, Charlton M and Laricchia G, Hyp Int 44 (1989) pp271-286

Measurement of positron mobility in silicon
Simpson R I, Stewart M G, Beling C D and Charlton M, J Phys-Condensed Matter 1 (1989) pp7251-7256

Single-crystal nickel foils as positron transmission-mode moderators
Zafar N, Chevallier J, Laricchia G and Charlton M, J Phys D 22 (1989) pp868-870

1988

Positron and electron impact double ionisation of helium
Charlton M, Andersen L H, Brun-Nielsen L, Deutch B I, Hvelplund P, Jacobsen F M, Knudsen H, Laricchia G, Poulsen M R and Pedersen J O, J Phys B 21 (1988) L545-L549

Antihydrogen production by positronium antiproton collisions in an ion trap
Deutch B I, Jacobsen F M, Andersen L H, Hvelplund P, Knudsen H, Holzscheiter M H, Charlton M and Laricchia G, Physica Scripta t22 (1988) pp248-255

Observation of simultaneous positronium formation and excitation in positron-CO2 scattering
Laricchia G, Charlton M and Griffith T C, J Phys B 21 (1988) L227-L232

The production of a timed tunable beam of positronium atoms
Laricchia G, Davies S A, Charlton M and Griffith T C, J Phys E 21 (1988) pp886-888

Experimentation with thin single crystal-W foils as slow positron transmission mode moderators
Zafar N, Chevallier J, Jacobsen F M, Charlton M and Laricchia G, Appl Phys A-Solids and Surfaces 47 (1988) pp409-412

1987

Low-energy positron beams - origins, developments and applications
Beling C D and Charlton M, Contemp Phys 28 (1987) pp241-266

A field-assisted moderator for low-energ y positron beams
Beling C D, Simpson R I, Charlton M, Jacobsen F M, Griffith T C, Moriarty P and Fung S, Appl Phys A 42 (1987) pp111-116

Applications of accelerator-based low-energy positron beams in atomic physics
Charlton M and Jacobsen F M, Appl Phys A 43 (1987) pp235-245

A proposed source of atomic hydrogen suitable for the measurement of total and partial scattering cross sections
Charlton M, Zafar N, Laricchia G, Smith A C H and Corrigan S J B, Atomic Physics with Positrons (1987) pp383-384

On antihydrogen formation in collisions of antiprotons with positronium
Humerston J W, Charlton M, Jacobsen F M and Deutch B I, J Phys B 20 (1987) L25-L29

Density dependence of positron annihilation and positronium formation in H2 at temperatures between 77 and 297K
Laricchia G, Charlton M, Beling C D and Griffith T C, J Phys B 20 (1987) pp1865-1874

On the production of a timed positronium beam by positron-gas scattering
Laricchia G, Davies S A, Charlton M and Griffith T C, Atomic Physics with Positrons (1987) pp223-231

The production of collimated beams of o-Ps atoms using charge exchange in positron-gas collisions
Laricchia G, Charlton M, Davies S A, Beling C D and Griffith T C, J Phys B 20 (1987) L99-L105

Low energy positron transmission measurement from thin single-crystal W foil
Zafar N, Jacobsen F M, Chevallier J, Charlton M and Laricchia G, Atomic Physics with Positrons (1987) pp451-453

1986

Experimental aspects of positron and positronium physics
Griffith T C, Advances in atomic and molecular physics 22 (1986) pp37-75

On the annihilation rate of thermalized free positrons in gases
Heyland G R, Charlton M, Davies S A and Griffith T C, Phys Letts A 119 (1986) pp289-292

Comment on the density and electric-field dependence of the positronium fraction in gaseous methane
Jacobsen F M, Charlton M and Laricchia G, J Phys B 19 (1986) L111-L114

1985

A determination of positron mobilities in low-density gases
Charlton M, J Phys B 18 (1985) pp1667-1671

Effect of an electric-field on ps formation in gaseous CO2
Charlton M and Curry P J, Nuovo Cimento D-condensed matter 6 (1985) pp17-24

Experimental studies of positrons scattering in gases
Charlton M, Reports on Progress in Physics 48 (1985) pp737-793

Evidence for ps formation in spurs in high-density gaseous CO2
Cuury P J and Charlton M, Chem Phys 95 (1985) pp313-320

The temperature-dependence of free positron lifetimes and positronium fractions in gaseous CO2 and SF6
Heyland G R, Charlton M, Griffith T C and Clark G, Chem Phys 95 (1985) pp157-163

Excited state positronium formation in low density gases
Laricchia G, Charlton M, Clark G and Griffith T C, Phys Lett 109A (1985) pp97-100

The annihilation of positrons and positronium formation in gaseous Kr and Xe
Wright G L, Charlton M, Griffith T C and Heyland G R, J Phys B 18 (1985) pp4327-4347

1984

Measurements of low-energy positron/electron-Ne and positron-Ar total scattering cross sections
Charlton M, Laricchia G, Griffith T C, Wright G L and Heyland G R, J Phys B 17 (1984) pp4945-4951

1983

Positronium formation cross sections in the inert gases
Charlton M, Clark G, Griffith T C and Heyland G R, J Phys B 16 (1983) L465-L470

Total scattering cross sections for low-energy positrons in the molecular gases H2 , N2 , CO2 , O2 and CH2
Charlton M, Griffith T C, Heyland G R and Wright G L, J Phys B 16 (1983) pp323-341

Positron lifetime parameters in H -2 , CO2 and CH4
Wright G L, Charlton M, Clark G, Griffith T C and Heyland G R, J Phys B 16 (1983) pp4065-4088

1982

Positron lifetime spectra for gases
Heyland G R, Charlton M, Griffith T C and Wright G L, Can J Phys 60 (1982) pp503-516

1981

Rotational excitation and momentum-transfer in slow positron-molecule collisions
Coleman P G, Griffith T C, Heyland G R, J Phys B 14 (1981) pp2509-2517

Positronium and positronium ions
Griffith T C, Nature 292 5825 (1981) pp674-674

1980

The energy dependence of positronium formation in gases
Charlton M, Griffith T C, Heyland G R, Lines K S and Wright G L, J Phys B 13 (1980) L575-L760

1979

The interactions of positrons with gaseous atoms and molecules
Griffith T C, Positron annihilation 1979

Total cross-sections for the scattering of positrons by helium, neon and argon at intermediate energies
Griffith T C, Heyland G R, Lines K S and Twomey T R, Appl Phys 19 (1979) pp431-437