Current Research

We are interested in polarized electron physics. Our work involves studies of polarized electrons scattering from atomic and chiral molecular targets, the development of novel sources of polarized electrons and electron polarimeters, and investigations of the fundamental nature of the electron. We are funded by the Physics Division of the National Science Foundation.

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2016

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A cylindrically symmetric “micro-Mott” electron polarimeter, Nathan B. Clayburn, Evan M. Brunkow, S. J. Burtwistle, George H. Rutherford, and Timothy J. Gay

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Anomalously Large Chiral Sensitivity in the Dissociative Electron Attachment of 10-Iodocamphor, J. M. Dreiling, F. W. Lewis, J. D. Mills, and Timothy J. Gay

2012

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Orientation of doubly excited states in N2, John E. Furst, Timothy J. Gay, Joshua Machacek, David Kilkoyne, and Kenneth W. McLaughlin

2011

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Detecting an extended light source through a lens, E. T. Litaker, J. R. Machacek, and Timothy J. Gay

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Production of excited atomic hydrogen and deuterium from H2, HD and D2 photodissociation, J R. Machacek, V M. Andrianarijaona, J. E. Furst, A L D Kilcoyne, A L Landers, E T Litaker, K W McLaughlin, and Timothy J. Gay

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Measurement of Electron Beam Polarization from Unstrained Bulk GaAs via Two Photon Photoemission, J L McCarter, Timothy J. Gay, J Hansknecht, M Poelker, and M L Stutzman

2010

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Alignment and orientation of diatomic molecules induced by polarized electron impact, Jack W. Maseberg and Timothy J. Gay

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A low-voltage retarding-field Mott polarimeter for photocathode characterization, J.L. McCarter, M.L. Stutzman, K.W. Trantham, Timothy G. Anderson, A.M. Cook, and Timothy J. Gay

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Electron-spin-reversal phenomenon in optically pumped rubidium, E. B. Norrgard, D. Tupa, J. M. Dreiling, and Timothy J. Gay

2009

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Use of partial-wave decomposition to identify resonant interference effects in the photoionization–excitation of argon, Timothy J. Gay, Chris H. Greene, J. R. Machacek, K. W. McLaughlin, H. W. van der Hart, Orhan Yenen, and Duane H. Jaecks

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Spin Torque on Molecular Rotation Induced by Polarized Electrons, J. W. Maseberg and Timothy J. Gay

2008

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Active feedback scheme for minimization of helicity-dependent instrumental asymmetries, M. I. Fabrikant, K. W. Trantham, V. M. Andrianarijaona, and Timothy J. Gay

2007

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Radiation trapping in rubidium optical pumping at low buffer-gas pressures, Mark A. Rosenberry, J. P. Reyes, D. Tupa, and Timothy J. Gay

2006

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Production of excited atomic hydrogen and deuterium from H2 and D2 photodissociation, J. D. Bozek, J. E. Furst, Timothy J. Gay, H. Gould, A. L. D. Kilcoyne, J. R. Machacek, F. Martin, K. W. McLaughlin, and J. L. Sanz-Vicario

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Angular Momentum Partitioning in the Dissociation of Diatomic Molecules, Timothy J. Gay, J. D. Bozek, J. E. Furst, Gordon A. Gallup, A. S. Green, A. L. D. Kilcoyne, J. R. Machacek, J. W. Maseberg, K. W. McLaughlin, and Mark A. Rosenberry

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Fluorescence polarization of helium negative-ion resonances excited by polarized electron impact, J. W. Maseberg and Timothy J. Gay

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An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism, A.M. Scheer, Gordon A. Gallup, and Timothy J. Gay

2005

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Angular momentum partitioning and the subshell multipole moments in impulsively excited argon ions, H. M. Al-Khateeb, B. G. Birdsey, and Timothy J. Gay

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Angular momentum partitioning and the subshell multipole moments in impulsively excited argon ions, H. M. Al-Khateeb, B. G. Birdsey, and Timothy J. Gay

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Angular momentum partitioning and the subshell multipole moments in impulsively excited argon ions, H. M. Al-Khateeb, B. G. Birdsey, and Timothy J. Gay

2004

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Spin-Exchange-Induced Circularly Polarized Molecular Fluorescence, A. S. Green, Gordon A. Gallup, and Mark A. Rosenberry

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Spin-Exchange-Induced Circularly Polarized Molecular Fluorescence, A.S. Green, Gordon A. Gallup, Mark A. Rosenberry, and Timothy J. Gay

2002

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Determination of Hexadecapole Moments for the 3p4(1D) Core of Argon II Excited in Polarized e--Ar Collisions, B. G. Birdsey, H. M. Al-khateeb, and Timothy J. Gay

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Effect of Relativistic Many-Electron Interactions on Photoelectron Partial Wave Probabilities, K. W. McLaughlin, Orhan Yenen, Duane H. Jaecks, Timothy J. Gay, M. M. Sant'Anna, D. Calabrese, and B. Thaden-Jordan

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Progress with Optically Pumped Sources of Polarized Electrons, Mark A. Rosenberry, Herman Batelaan, J. P. Reyes, and Timothy J. Gay

2001

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A theoretical study of the effects of insulators on electron transport through electrostatic tube lenses, T. G. Anderson, B. G. Birdsey, S. M. Woeher, Mark A. Rosenberry, and Timothy J. Gay

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Quantum-Mechanical Analysis of a Longitudinal Stern-Gerlach Effect, Gordon A. Gallup, Herman Batelaan, and Timothy J. Gay

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Monte Carlo studies of Mott scattering asymmetries from gold foils, M. A. Khakoo, D. Roundy, C. Hicks, N. Margolis, E. Yeung, A. W. Ross, and Timothy J. Gay

2000

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Angular Momentum Partitioning and Hexacontatetrapole Moments in Impulsively Excited Argon Ions, H. M. Al-Khateeb, B. G. Birdsey, and Timothy J. Gay

1999

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A simplified GaAs polarized electron source, H. M. Al-Khateeb, B. G. Birdsey, T. C. Bowen, A. S. Green, M. E. Johnston, and Timothy J. Gay

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Optically Pumped Electron Spin Filter, Herman Batelaan, A. S. Green, B. A. Hitt, and Timothy J. Gay

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Near-threshold measurement of integrated Stokes parameters for Kr excited by polarized electrons, B. G. Birdsey, H. M. Al-Khateeb, M. E. Johnston, T. C. Bowen, Timothy J. Gay, V. Zeman, and K. Bartschat

1998

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Batelaan and Gay Reply, Herman Batelaan and Timothy J. Gay

1997

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Stern-Gerlach Effect for Electron Beams, Herman Batelaan, Timothy J. Gay, and J. J. Schwendiman

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Electron-Collision-Induced Alignment of Rare Gases near Threshold, V. Zeman, K. Bartschat, Timothy J. Gay, and K. W. Trantham

1996

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Current Status Of The Saddle-Point Model, Timothy J. Gay

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Optical electron polarimetry with heavy noble gases, Timothy J. Gay, J. E. Furst, K. W. Trantham, and W. M. K. P. Wijayaratna

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TWO-CENTER EFFECTS IN ION-ATOM COLLISIONS: A Symposium in Honor of M. Eugene Rudd, Lincoln, NE May 1994 — Contents and Preface, Timothy J. Gay and Anthony F. Starace

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An inline optical electron polarimeter, K. W. Trantham, Timothy J. Gay, and R. J. Vandiver

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Failure to observe electron circular dichroism in camphor, K. W. Trantham, M. E. Johnston, and Timothy J. Gay

1995

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Failure to observe electron circular dichroism in camphor, K. W. Trantham, M. E. Johnston, and Timothy J. Gay

1994

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Energy spread and ion current measurements of several ion sources, A. D. Gaus, W. T. Htwe, J. A. Brand, Timothy J. Gay, and M. Schulz

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Clean ultrahigh vacuum system with single-structure diffusion pumps, Timothy J. Gay, M.C. Fritts, J.E. Furst, M.A. Khakoo, E.R. Mell, M.T. Seiger, and M.W.K.P. Wijayaratna

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Clean ultrahigh vacuum system with single-structure diffusion pumps, Timothy J. Gay, M.C. Fritts, J.E. Furst, M.A. Khakoo, E.R. Mell, M.T. Seiger, and M.W.K.P. Wijayaratna

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Superelastic and inelastic He2++He state-selective electron capture, V. D. Irby, Timothy J. Gay, J. T. Park, S. W. Bross, and A. D. Gaus

1993

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Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons, J. E. Furst, W. M. K. P. Wijayaratna, D. H. Madison, and Timothy J. Gay

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High-Voltage Variable Resistor for Ion Energy Spectroscopy, Timothy J. Gay, V. D. Irby, and S. P. Yallaly

1992

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Production of a high-density state-selected metastable neon beam, J. A. Brand, J. E. Furst, Timothy J. Gay, and L. D. Shearer

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An attempt to observe Mott scattering optically, J. E. Furst, Timothy J. Gay, W. M. K. P. Wijayaratna, K. Bartschat, H. Geesmann, M. A. Khakoo, and D. H. Madison

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Mott electron polarimetry, Timothy J. Gay and F. B. Dunning

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Extrapolation procedures in Mott electron polarimetry, Timothy J. Gay, M. A. Khakoo, J. A. Brand, J. E. Furst, W. V. Meyer, W. M. K. P. Wijayaratna, and F. B. Dunning

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Electron production in proton collisions with atoms and molecules: energy distributions, M. Eugene Rudd, Y.-K. Kim, D. H. Madison, and Timothy J. Gay

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State-selective capture in collisions of protons with noble gases, M. Schulz, D. M. Blakenship, S. W. Bross, A. D. Gaus, Timothy J. Gay, W. Htwe, J. T. Park, and J. L. Peacher

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Angular-differential cross sections for H(2p) formation in intermediate-energy proton-helium collisions, D. G. Seely, S. W. Bross, A. D. Gaus, J. W. Edwards, D. R. Schultz, Timothy J. Gay, J. T. Park, and J. L. Peacher

1990

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Measurement of parity violation in the elastic scattering of polarized electrons from 12C, P. A. Souder, R. Holmes, D. - H. Kim, K. S. Kumar, M. E. Schulze, K. Isakovich, G. W. Dodson, K. W. Dow, M. Farkhondeh, S. Kowalski, M. S. Lubell, J. Bellanca, M. Goodman, S. Patch, Richard Wilson, G. D. Cates, S. Dhawan, Timothy J. Gay, V. W. Hughes, A. Magnon, R. Michaels, and H. R. Schaefer

1989

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Orientation of hydrogen 2p after tilted-foil excitation, C. J. Liu, Timothy J. Gay, and K. P. Schuler

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Elastic angular differential cross sections for quasi-oneelectron collision systems at intermediate energies: (Na+, Li+)+H and (Mg+, Be+)+He, J. L. Peacher, E. Redd, D. G. Seely, Timothy J. Gay, D. M. Blakenship, and J. T. Park

1988

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Projectile-charge dependence of ejected-electron spectra, V. D. Irby, Timothy J. Gay, J. Wm. Edwards, E. B. Hale, M. L. McKenzie, and R. E. Olson

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Dynamics of Antimatter-Atom Collisions, R. E. Olson and Timothy J. Gay

1987

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Saddle-point electrons in ionizing ion-atom collisions, R. E. Olson, Timothy J. Gay, H. G. Berry, and V. D. Irby

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Angular-differential studies of excitation in quasi-oneelectron collisions at "high" energy, E. Redd, Timothy J. Gay, D. M. Blakenship, J. T. Park, J. L. Peacher, and D. G. Seely

1986

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New insights into Mott-scattering electron polarimetry, G. D. Fletcher, Timothy J. Gay, and M. S. Lubell

1985

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Experimental study of spin-exchange effects in elastic and ionizing collisions of polarized electrons with polarized hydrogen atoms, G. D. Fletcher, M. J. Alguard, Timothy J. Gay, V. W. Hughes, P.F. Wainwright, M. S. Lubell, and W. Raith

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Angular differential cross sections for the excitation of 11S helium to the 21S and 21P states by 25- to 100-keV-proton impact, T. J. Kvale, D. G. Seely, D. M. Blakenship, E. Redd, Timothy J. Gay, M. Kimura, E. Rille, J. L. Peacher, and J. T. Park

1982

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Measurement of Spin-Exchange Effects in Electron-Hydrogen Collisions: 90° Elastic Scattering from 4 to 30 eV, G. D. Fletcher, M. J. Alguard, Timothy J. Gay, V. W. Hughes, C. W. Tu, P. F. Wainwright, M. S. Lubell, W. Raith, and F. C. Tang

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Measurement of spin-exchange effects in electronhydrogen collisions: Further studies of impact ionization, Timothy J. Gay, G. D. Fletcher, M. J. Alguard, V. W. Hughes, P. F. Wainwright, and M. S. Lubell

1981

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Molecular effects in beam-foil collision-induced alignment of He I, Timothy J. Gay, H. G. Berry, and R. DeSerio

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Energy dependence of alignment in foil collision-excited n=3 states of He I, Timothy J. Gay, H. G. Berry, R. DeSerio, H. P. Garnir, R. M. Schectman, N. Schaffel, R. D. Hight, and D.J. Burns

1980

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Orientation and alignment of the 3p 1P and 4d 1D levels of neutral helium, R. M. Schectman, R. D. Hight, S. T. Chen, L. J. Curtis, H. G. Berry, Timothy J. Gay, and R. Deserio

1979

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Temperature dependence of alignment production in He I by beam-foil excitation, Timothy J. Gay and H. G. Berry

1977

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Alignment of helium excited by thin carbon foils, R. D. Hight, R. M. Schectman, H. G. Berry, G. Gabrielse, and Timothy J. Gay

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Alignment of helium excited by thin carbon foils, R. D. Hight, R. M. Schectman, H. G. Berry, G. Gabrielse, and Timothy J. Gay