Faculty - Gay

Dr. Timothy Gay Dr. Gay's Web Page Dr. Gay's Web Page email: Dr. Gay NCMN Homepage

Dr. Timothy Gay, Professor
Physics & Astronomy
University of Nebraska - Lincoln
073 T. Jorgensen Hall
Lincoln, Nebraska 68588-0299
office: (402) 472-2879
email: tgay@unl.edu
Gay's webpageFootball: It's Physics and Future - on UNL Nebraska Lectures Video

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.

Recent Publications

Measurement of Electron Beam Polarization from Unstrained Bulk GaAs via Two Photon Photoemission
J.L.McCarter, T.J.Gay, J.Hansknecht, M.Poelker, and M.L.Stutzman
J.Phys.B 44, 045201 (2011)
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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 T.J.Gay
J.Phys.B 44, 045201 (2011)
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Detecting an Extended Light Source Through a Lens
E.T. Litaker, J.R.Machacek, and T.J.Gay
J. Phys. 32, 1107 (2011)
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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, T.J.Gay
J. Phys. B: At. Mol. Opt. Phys. 44 (2011)
[PDF]

Electron Spin Reversal Phenomenon in Optically-Pumped Rb
E.B.Norrgard, D.Tupa, J.M.Dreiling, T.J.Gay
Phys. Rev. A 82, 033408 (2010)
[PDF]

A low-voltage retarding-field Mott polarimeter for photocathode characterization
J.L. McCarter, M.L. Stutzman, K.W.Trantham, T.G.Anderson, A.M.Cook, T.J.Gay
NIMA Phys. Research A 618, Pages 30-36 (2010)
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Alignment and Orientation of Diatomic Molecules Induced by Polarized Electron Impact
J.W. Maseberg, T.J. Gay
J. Phys. Conf. Ser. 212, 012021 (2010)
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Physics and Technology of Polarized Electron Scattering from Atoms and Molecules
T.J. Gay
Advances in Atomic, Molecular and Optical Physics 57, Chapter 4 (2009)
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Spin torque on molecular rotation induced by polarized electrons
J.W. Maseberg, T.J. Gay
Phys. Rev. A 79, 022705 (2009)
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Use of Partial-Wave Decomposition to Identify Resonant Interference Effects in the Photoionization-Excitation of Argon
T.J. Gay, C.H. Greene, J.R. Machacek, K.W. McLaughlin, H.W. van der Hart, O. Yenen, D.H. Jaecks
J. Phys. B 42, 044008 (2009)
[PDF]

Active feedback scheme for minimization of helicity-dependent instrumental asymmetries
M.I. Fabrikant, K.W. Trantham, V.A. Andrianarijaona, T.J. Gay
Appl. Opt., Doc ID 90666 (Posted 4/08, in press)
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Comment on elimination of polarization dependence from optical excitation functions
J.W. Maseberg
J. Opt. Soc. Am. B 25, 680 (2008)
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Radiation trapping in rubidium optical pumping at low buffer-gas pressures
M.A. Rosenberry, J.P. Reyes, D. Tupa, T.J. Gay
Phys. Rev. A 75, 023401 (2007)
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Fluorescence Polarization of Helium Negative-ion Resonances Excited by Polarized Electron Impact
J.W. Maseberg, T.J. Gay
J. Phys. B. 39, 4861-4870 (2006) [PDF]

Production of excited atomic hydrogen and deuterium from H2 and D2 photodissociation
J.D. Bozek, J.E. Furst, T.J. Gay, H. Gould, A.L.D. Kilcoyne, J.R. Machacek, F. Martín, K.W. McLaughlin and J.L Sanz-Vicario
J. Phys. B. 39, 4871-4882 (2006)
[PDF]

An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism
A.M. Scheer, G.A. Gallup, and T.J. Gay
J. Phys. B. 39, 2169-2181 (2006)
[PDF]

Angular Momentum Partitioning and the Subshell Multipole Moments in Impulsively Excited Argon Ions
H.M. Al-Khateeb, B.G. Birdsey, and T.J. Gay
Phys. Rev. A 71, 032707 (2005)
[PDF]

Spin-Exchange-Induced Circularly-Polarized Molecular Fluorescence
A.S. Green, G.A.Gallup, M.A. Rosenberry, and T.J. Gay
Phys. Rev. Lett. 92, 093201 (2004)
[PDF]

The Effect of Relativistic Many-Electron Interactions on Photoelectron Partial-Wave probabilities
K.W. McLaughlin, O. Yenen, D.H. Jaecks, T.J. Gay, M.M Sant'Anna, D. Calabrese, and B. Jordan-Thaden
Phys. Rev. Lett. 88, 123003 (2002)
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Monte Carlo Studies of Mott Scattering Asymmetrics from Gold Foils
M.A. Khakoo, D. Roundy, C. Hicks, N. Margolis, E. Yeung, A.W. Ross, and T.J. Gay
Phys. Rev. A 64, 052713 (2001) [PDF]

A Theoretical Study of the Effects of Insulators on Electon Transport Through Electrostatic Tube Lenses
T.G. Anderson, B.G. Birdsey, S.M. Woeher, M.A. Rosenberry, T.J. Gay
Rev. Sci. Instr. 72, 2923 (2001)
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Quantum Mechanical Analysis of a Longitudinal Stern-Gerlach Effect
G.A. Gallup, H. Batelaan, T.J. Gay
Phys. Rev. Lett. 86, 4508 (2001)
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Progress with Optically Pumped Sources of Polarized Electrons
M.A. Rosenberry, H. Batelaan, J.P. Reyes, T.J.Gay
2001 Missouri-Rolla Conference Submission
[PDF] (Sans figures)

Angular Momentum Partitioning and Hexacontatetrapole Moments in Impulsively Excited Argon Ions
H.M. Al-Khateeb, B.G. Birdsey, T.J. Gay
Phys. Rev. Lett. 85, 4040 (2000)
[PDF]