Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms

Armstrong, Gregory S.  J.; Colgan, James Patrick; Pindzola, M. S.; Amami, S.; Madison, D. H.; Pursehouse, J.; Nixon, K. L.; Murray, A. J.

doi:10.1103/PhysRevA.92.032706

Title: Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms

Journal Article · Fri Sep 11 00:00:00 EDT 2015 · Physical Review A - Atomic, Molecular, and Optical Physics

DOI:https://doi.org/10.1103/PhysRevA.92.032706· OSTI ID:1329872

Armstrong, Gregory S. J. ^[1]; Colgan, James Patrick ^[2]; Pindzola, M. S. ^[3]; Amami, S. ^[4]; Madison, D. H. ^[4]; Pursehouse, J. ^[5]; Nixon, K. L. ^[6]; Murray, A. J. ^[5]

Kansas State Univ., Manhattan, KS (United States). Dept. of Physics. J.R. Macdonald Lab.; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
Auburn Univ., AL (United States). Dept. of Physics
Missouri Univ. of Science and Technology, Rolla, MO (United States). Physics Dept.
Univ. of Manchester (United Kingdom). School of Physics and Astronomy. Photon Science Inst.
Federal Univ. of Juiz de Fora (UFJF) (Brazil). Dept. of Physics

Recent measurements have examined the electron-impact ionization of excited-state laser-aligned Mg atoms. In this paper we show that the ionization cross section arising from the geometry where the aligned atom is perpendicular to the scattering plane directly probes the unnatural parity contributions to the ionization amplitude. The contributions from natural parity partial waves cancel exactly in this geometry. Our calculations resolve the discrepancy between the nonzero measured cross sections in this plane and the zero cross section predicted by distorted-wave approaches. Finally, we demonstrate that this is a general feature of ionization from p-state targets by additional studies of ionization from excited Ca and Na atoms.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Contributing Organization:: Kansas State Univ., Manhattan, KS (United States); Auburn Univ., AL (United States); Missouri Univ. of Science and Technology, Rolla, MO (United States); Univ. of Manchester (United Kingdom); Federal Univ. of Juiz de Fora (UFJF) (Brazil)

Grant/Contract Number:: AC52-06NA25396; 1305527; 1505819; AC5206NA25396

OSTI ID:: 1329872

Alternate ID(s):: OSTI ID: 1215460

Report Number(s):: LA-UR-15-24745

Journal Information:: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 92, Issue 3; ISSN 1050-2947

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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