University of California - Riverside
The Accelerator has arrived to out lab.
Our lab has been moved to a new facility.
Our lab is currently moving to a new facility, where we are installing a laser room, and have employed several Undergraduate researchers to assist in our efforts.
Cassidy and Mills have observed molecular positronium for the first time! More…
Interactions between positronium atoms in porous silica, Cassidy DB, Mills AP, Physical Review Letters, Vol 100, Issue 1, Art# 013401, 1/11/08
Evidence for positronium molecule formation at a metal surface, Cassidy DB, Deng SHM, Mills AP, Physical Review A, Vol 76, Issue 6, Art# 062511, 12/07,
A fast detector for single-shot positron annihilation lifetime spectroscopy, Cassidy DB, Mills AP, Nuclear Instruments & Methods in Physics Research Section A, Vol 580, Issue 3, pp. 1338-1343, 10/11/07
Sticking coefficient of nitrogen on solid N-2 at low temperatures, Deng, SHM, Cassidy DB, Greaves RG, et al, Applied Surface Science, Vol 253, Issue 24, pp. 9467-9469, 10/15/07
Radiation damage in a-SiO2 exposed to intense positron pulses, Cassidy DB, Mills, AP, Nuclear Instruments & Methods in Physics Research Section B, Vol 262, Issue 1, pp. 59-64, 7/07
The production of molecular positronium, Cassidy DB, Mills AP, Nature, Vol 449, Issue 7159, pp. 195-197, 09/07
Positronium as a probe of transient paramagnetic centers in a-SiO2, Cassidy DB, Yokoyama KT, Deng SHM, et al, Physical Review B, Vol 75, Issue 8, Art# 085415, 02/07
Chemistry and Physics with many positrons, Mills, AP, Radiation Physics and Chemistry, Vol 76, Issue 2, pp. 76-83, 02/07
Evaluation of self-organized diffusion barrier continuity on a nano-architectural silica thin film with two-dimensionally connected cage-like pores using positronium time of flight spectroscopy, Tanaka HKM, Kurihara T, Nishiyama, N et al., Microporous and Mesoporous Materials, Vol 95, Issue 1-3, pp. 165-171, 10/18/06
Positronium time of flight measurements of an open-pored spin-on low-k mesoporous film, Tanaka HKM, Kurihara T, Mills AP, Journal of Physics-Condensed Matter, Vol 18, Issue 37, Pages: 8581-8588, 9/20/06
Accumulator for the production of intense positron pulses, Cassidy DB, Deng SHM, Greaves RG, et al., Review of Scientific Instruments, Vol 77, Issue 7, Art# 073106, 07/06
Spin-polarization-induced tenfold magnetoresistivity of highly metallic two-dimensional holes in a narrow GaAs quantum well, Gao XPA, Boebinger GS, Mills AP, et al., Physical Review B, Vol 73, Issue 24, Art# 241315, 0606
"Noisy" emission of a slowly released single conponent plasma, Cassidy DB, Deng SHM, Mills AP, Nuclear Instruments & Methods in Physics Research Section B - Beam Interactions with Materials and Atoms, Vol 248, Issue 1, pp. 121-126, 07/06
Single shot positron annihilation lifetime spectroscopy, Cassidy DB, Deng SHM, Tanaka HKM, et al., Applied Physics Letters, Vol 88, Issue 19, Art# 194105, 05/08/06
Evaluation of the diffusion barrier continuity on porous low-k films using positronium time of flight spectroscopy, Tanaka HKM, Kurihara T, Mills AP, Physical Review B, Vol 72, Issue 19, Art# 193408, 11/05
Suppression of the slow component of scintillation light in BaF2, Biasini, M, Cassidy DB, Deng SHM, et al., Nuclear Instruments & Methods in Physics Research Section A - Accelerators Spectrometers Detectors and Associated Equipment, Vol 553, Issue 3, pp. 550-558, 11/21/05
Experiments with a high-density positronium gas, Cassidy DB, Deng SHM, Greaves RG, et al., Physical Review Letters, Vol 95, Issue 19, Art# 195006, 11/4/05
Contactless gating, surface charging and illumination effects in a buried AI024Ga076As/GaAs quantum well structure, Biasini M, Gann RD, Pfeiffer LN, et al., European Physical Journal B, Vol 47, Issue 2, pp. 305-314, 09/05
Measuring the continuity of diffusion barriers on porous films using gamma-ray energy spectra of escaping positronium, Xu J, Mills AP, Case C, Applied Physics Letters, Vol 87, Issue 5, Art# 054105, 8/1/05
Remembering Martin Deutsch , Mills AP, Materials Science Forum, Vol 445-446, pp. 5-8, 01/04
Prospects for making a Bose-Einstein-Condensed Positronium Annihilation Gamma Ray Laser, Mills AP, Cassidy DB, Greaves RG, Materials Science Forum, Vol 445-446, pp. 424-429, 01/04
Quantum Antidot Formation and Correlation to Optical Shift of Gold Nanoparticles Embedded in MgO, Xu Jun, Moxom J, Overbury SH, White CW, Mills AP, Suzuki R, Physical Review Letters, Vol 88, # 17, pp. 305-314, 29/4/02
Positronium molecule formation, Bose-Einstein condensation and stimulated annihilation, Mills A, Elsevier, Nuclear Instrumants and Methods in Physics Reserach B 192, pp. 107-116, 2002
Positron beam production with a deteron accelerator, Cassidy DB, Canter KF, Shefer RE, Klinkowstein RE, Hughey BJ, Elsevier, Nuclear Instruments and Methods in Physics Research B 195, pp. 442-448 , 3/27/02
Can we measure the gravitational free fall of cold Rydberg state positronium?, Mills AP, Leventhal M, Elsevier, Nuclear Instruments and Methods in Physics Research B, 2002
Resonant versus nonresonant nuclear excitation of 115In by positron annihilation, Cassidy DB, Hunt AW, Asoka-Kumar P, Bhat BV, Cowan TE, Howell RH, Lnn KG, Mills AP, Palathingal JC, Golovchenco JA, Physical Review C, Vol 64, Art# 054603, 10/1/01
New Experiments with Bright Positron and Positronium Beams, Surko CM, Gianturco FA, Kluwer Academic Pubs., pp. 115-126, 2001
Vacancy Clusters on Surfaces of Au Nanoparticles Embedded in MgO, Xu Jun, Mills AP, Ueda A, Henderson DO, Suzuki R, Ishibashi S, Physical Review Letters, Volume 83, Number 22, 11/29/1999
Impurity-vacancy defects in implanted float-zone and Czochralski-Si, Xu Jun, Mills AP, Suzuki R, Roth EG, Holland OW, Applied Surface Science 149, pp. 193-197, 1999
Work function and affinity changes associated with the structure of hydrogen-terminated diamond (100) surfaces, Brandes GR, Mills AP, Physical Review B, Volume 58, Number 8, 8/15/1998
Possibilities for Measuring the Passive Gravitational Mass of Electrons and Positrons in Free Horizontal Flight, Mills AP, Hardonic Journal 19, pp. 77-86, 1996
Proceedings of the RIKEN Symposium: Physics with Polarized Positrons, Mills AP, pp. 86-88, 12/14/1995
Positron and Positronium Emission Spectroscopies, Mills AP, 1995
Possibilities for a high intensity polarized slow positron source using 13N, Mills AP, pp. 86-88, 1995
The internal and translational energy dependence of molecular condensation coefficients: SF6 and CCl4, Sibener SJ, Lee YT, American Institute of Physics, J. Chem. Phys., Volume 101, Number 2, 7/15/1994
Possibilities for Bose condensation of Positronium, Mills AP, Platzman PM, Physical Review B, Volume 49, Number 1, pp. 454-458 , 1/1/1994
Positron mobility in perylene, Mills AP, Karl N, Physical Review B, Volume 48, Number 10, pp. 7050-7056 , 9/1/1993
Measurement of the Positronium 13S1-23S1 Interval by Continuous-Wave Two-Photon Excitation, Fee MA, Mills AP, Chu S, Shaw ED, Danzman K, Chichester RJ, Zuckerman DM, Physical Review Letters, Volume 70, Number 10, pp. 1397-1400, 3/8/1993
Analysis of the atomic geometries of the (1010) and (1120) surfaces od CdSe by low-energy-electron diffraction and low-energy-positron diffraction, Horsky TN, Brandes GR, Canter CF, Duke CB, Paton A, Lessor DL, Mills AP, Kahn A, Horng SF, Stevens K. Stiles K, Physical Review B, Volume 46, Number 11, pp. 7011-7026 , 9/15/1992
Thermal desorption of cold positronium from oxygen-treated Al(111) surfaces, Mills AP, Shaw ED, Leventhal M, Chichester RJ, Zuckerman DM, Physical Review B, Volume 44, Number 11, pp. 5791-5799 , 9/15/1991
Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization, Fee MS, Mills AP, Shaw ED, Chichester RJ, Zuckerman DM, Chu S, Danzmann K, Physical Review A, Volume 44, Number 11, pp. R5-R8 , 7/1/1991
Positron-reemission-microscope study of positron implantation and diffusion, Mills AP, Brandes GR, Canter KF, Physical Review B, Volume 43, Number 13, pp. 103-110, 5/1/1991
Evidence for Quantum Sticking of Slow Positronium, Mills AP, Shaw ED, Leventhal M, Platzman PM, Chichester RJ, Zuckerman DM, Martin T, Bruinsma R, Lee RR, Physical Review Letters, Volume 66, Number 6, pp. 735-738, 2/11/1991
Positron spectroscopy of solid N2, Gullikson EM, Mills AP, Physical Review B, Third Series, Volume 42, Number 13, Part A, pp. 7695-7698, 11/1/1990
Slow Proton reemission from noble-gas solids, Mills AP, Leventhal M, Lanzerotti MY, Zuckerman DM, Physical Review B, Volume 42, Number 10, pp. 5973-5983, 10/1/1990
Improvement of rare-gas solid moderators by using conical geometry, Khatri R, Charlton M, Sferiazzo P, Lynn KG, Mills AP, Roellig LO, Applied Physical Letter, Volume 57, Number 22, pp. 2374-2376, 11/26/1990
Two-dimensional angular correlation of annihilation radiation study of positron interactions with surfaces of aluminum, Chen DM, Berko S, Canter KF, Mills AP, Lynn KG, Roellig LO, Sferlazzo P, Weinert M, West RN, Physical Review B, Volume 39, Number 7, pp. 3966-3989, 3/1/1989
Search for adiabatic positronium emission from a metal surface, Mills AP, Shaw ED, Chichester RJ, Zuckerman DM, Physical Review B, Volume 40, Number 13, pp. 8616-8619, 11/1/1989
Ion production by positron-molecule resonances, Passner A, Surko CM, Leventhal M, Mills AP, Physical Review A, Volume 37, Number 7, pp. 3706-3709, 4/1/1989
Production of slow positron bunches using a microtron accelerator, Mills AP, Shaw ED, Chichester RJ, Zuckerman DM, Rev. Sci. Instrum., Volume 60, Number 5, pp. 825-830, May 1989
Positronium thermalization in SiO2 Powder, Mills AP, Shaw ED, Chichester RJ, Zuckerman DM, Physical Review B, Volume 40, Number 4, pp. 2045-2052, 8/1/1989
Observation of Differences between Low-Energy Electron- and Positron-Diffraction Structural Determinations of the Cleavage Faces of CdSe, Horsky TN, Brandes GR, Canter KF, Duke CB, Horng SF, Kahn A, Lessor DL, Mills AP, Paton A, Stevens K, Stiles K, Physical Review Letters, Volume 62, Number 16, pp. 1876-1879, 4/17/1989
Evidence for threshold effects in posiron diffraction from NaF and LiF, Hornsky TN, Brandes GR, Canter KF, Lippel PH, Physical Review B, Volume 40, Number 11, pp. 7898-7903, 10/15/1989
Electron emission due to positronium annihilation in solid Ar, Kr, and Xe, Gullikson EM, Mills AP, Physical Review B, Volume 39, Number 9, pp. 6121-6124, 3/15/1989
Decay Rate and Other Properties of the Positronium Negative Ion, Mills AP, Friedman PG, Zuckerman DM, NASA Conference Publication 3058, pp. 213-221, 7/19/1989
Submicrom-Resolution Study of a Thin Ni Crystal Using a Brightness-Enhanced Positron Reemission Microscope, Brandes GR, Canter KF, Mills AP, Physical Review Letters, Volume 61, Number 5, pp. 492-495, 8/1/1989
Observation of Positronium Specular Reflection from LiF, Weber MH, Tang S, Berko S, Brown BL, Canter KF, Lynn KG, Mills AP, Roellig LO, Viescas AJ, Physical Review Letters, Volume 61, Number 22, pp. 2542-2545, 11/28/1988
Observation of intense two-bream positron diffraction and the precise determination of the positron band gap in rare-gas crystals, Gullikson EM, Mills AP, McRae EG, Physical Review B, Volume 37, Number 1, pp. 588-591, 1/1/1988
Laser Excitation of the Muonium 1S-2S Transition, Chu S, Mills AP, Yodh AG, Nagamine K, Miyake Y, Kuga T, Physical Review Letters, Volume 60, Number 2, pp. 101-104, 1/11/1988
Bragg reflection of low-energy positrons from the surface of graphite, Gullikson EM, Mills AP, Physical Review B, Volume 36, Number 16, pp. 8777-8779, 12/1/1987
Angle-Resolved Positronium Emission Spectroscopy, Chen DM, Berko S, Canter KF, Lynn KG, Mills AP, Roellig LO, Sferlazzo P, Weinert M, West RN, Physical Review Letters, Volume 58, Number 9, pp. 921-924, 3/2/1987
Solid neon moderator for producing slow positrons, Gullikson EM, Mills AP, Appl. Phys. Lett., Volume 49, Number 17, pp. 1121-1123, 10/27/1986
Positron Dynamics in Rare-Gas Solids, Gullikson EM, Mills AP, Physical Review Letters, Volume 57, Number 3, pp. 376-379, 7/21/1986
Observation of Low-Energy mu+ Emission from Solid Surfaces, Harshman DR, Warren JB, Beveridge JL, Kendall KR, Kiefl RF, Oram CJ, Mills AP, Crane WS, Physical Review Letters, Volume 56, Number 26, pp. 2850-2853, 6/30/1986
Velocity spectrum of positronium thermally desorbed from an Al(111) surface, Pfeiffer L, Mills AP, Physical Review B, Volume 32, Number 1, pp. 53-57, 7/1/1985
Solid neon moderator for producing slow positrons, Crane WS, Mills AP, Rev. Sci. Instrum., Volume 56, Number 9, pp. 1723-1726, September 1985
Positron or Positroniumlike Surface State on Al(100), Lynn KG, Mills AP, West RN, Berko S, Canter KF, Roellig LO, Physical Review Letters, Volume 54, Number 15, pp. 1702-1705, 4/15/1985
Techniques for Studying Systems Containing Many Positrons, Mills AP, Edited by Humbertson JW and McDowell MRC, Plenum Publishing Corporation, pp. 121-138, 1984
Measurement of the Positronium 13S1-23S1 Interval by Doppler-Free Two-Photon Spectroscopy, Chu S, Mills AP, Hall JL, Physical Review Letters, Volume 52, Number 19, pp. 1689-1692, 5/7/1984
Positronium Velocity Spectroscopy of the Electronic Density of States at a Metal Surface, Pfeiffer L, Platzman PM, Mills AP, Physical Review Letters, Volume 51, Number 12, pp. 1085-1088, 9/19/1983
Positron and positronium emission from tungsten (111), Wilson RJ, Mills AP, Physical Review B, Volume 27, Number 7, pp. 3949-3954, 4/1/1983
Measurement of the Decay Rate of the Positronium Negative Ion, Mills AP, Physical Review Letters, Volume 50, Number 9, pp. 671-674, 2/28/1983
Solid neon moderator for producing slow positrons, Mills AP, Physical Review A, Volume 27, Number 1, pp. 262-267, January 1983
Transmission of 1 6-kev positrons through thin metal films, Wilson RJ, Mills AP, Physical Review A, Volume 26, Number 1, pp. 490-500, July 1982
Slow Positron Beam Design Notes, Canter KF, Mills AP, National Research Concil of Canada, Volume 60, pp. 551-557, 1982
Excitation of the Positronium 13S2->23S1 Two-Photon Transition, Chu S, Mills AP, Physical Review Letters, Volume 48, Number 19, pp. 1333-1337, 5/10/1982
Thermodynamics of positronium thermal desorption from surfaces, Chu S, Murray CA, Mills AP, Physical Review B, Volume 23, Number 5, pp. 2060-2064, 3/1/1981
Observation of the Positronium Negative Ion, Mills AP, Physical Review Letters, Volume 46, Number 11, pp. 717-720, 3/16/1981
Time Binching of Slow Positrons for Annihilation Lifetime and Pulsed Laser Photon Absorption Experiments, Mills AP, Applied Physics, Volume 22, pp. 273-276, 3/20/1980
Further inprovements in the efficiency of low-energy positron moderators, Mills AP, Appl. Phys. Lett., Volume 37, Number 7, pp. 667-668, 10/1/1980
Diffusion of Positrons to Surfaces, Murray CA, Mills AP, Applied Physics, Volume 21, pp. 323-325, 1/3/1980
Brightness Enhancement of Slow Positron Beams, Mills AP, Applied Physics, Volume 23, pp. 189-191, 6/4/1980
Thermal Activation Measurement of Positron Binding Energies at Surfaces, Mills AP, Solid State Communications, Volume 31, pp. 623-626, Pergamon Press Ltd. Printed in Great Britain, 1979
Slow-Positron Emission from Metal Surfaces, Mills AP, Platzman PM, Brown BL, Physical Review Letters, Volume 41, Number 15, pp. 1076-1079, 10/9/1978
Positronium Formation at Surfaces, Mills AP, Physical Review Letters, Volume 41, Number 26, pp. 1828-1831, 12/25/1978
Measurement of the Mobility of Positrons in Germanium, pfeiffer L, Mills AP, Physical Review Letters, Volume 36, Number 23, pp. 1389-1393, 6/7/1976
Observations of Positronium Lyman-alpha Radiation*, Canter KF, Mills AP, Berko S, Physical Review Letters, Volume 34, Number 4, pp. 177-180, 1/27/1975
Fine-Structure Measurement in the First Excited State of Positronium*, Mills AP, Berko S, CAnter KF, Physical Review Letters, Volume 34, Number 25, pp. 1541-1544, 6/23/1975
Effects of collisions on the magnetic quenching positronium, Mills AP, The Journal of Chemical Physics, Volume 62, Number 7, pp. 2646-2659, 4/1/1975
Efficient Positronium Formation by Slow Positrons Incident on Solid Targets*, Canter KF, Mills AP, Berko S, Physical Review Letters, Volume 33, Number 1, pp. 7-10, 7/1/1974
Spin Distribution Studies in Ferromagnetic Metals by Polarized Positron Annihilation Experiments, Berko S, Mills AP, Journal de Physique, colloque C 1, Tome 32, pp. 287-288, March 1971
Search for C Nonconservation in Electron-Positron Annihilation, Berko S, Mills AP, Physical Review LEtters, Volume 18, Number 11, pp. 420-425, 3/13/1967