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Title: Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms

Abstract

Absolute cross sections have been determined for the dissociative recombination and dissociative excitation of {sup 4}HeH{sup +} for electron energies below 40 eV. The dissociative recombination cross section is in semiquantitative agreement with recent theoretical results by Sarpal, Tennyson, and Morgan [J. Phys. B {bold 27}, 5943 (1994)] and Guberman [Phys. Rev. A {bold 49}, R4277 (1994); in {ital XIXth} {ital International} {ital Conference} {ital on} {ital the} {ital Physics} {ital of} {ital Electronic} {ital and} {ital Atomic} {ital Collisions}, {ital Whistler}, {ital Canada}, AIP Conf. Proc. No. 360, edited by L. J. Dube, J. B. A. Mitchell, J. W. McConkey, and C. E. Brion (AIP, New York, 1995), p. 307]. The calculated resonant structure below a collision energy of 1 eV was not fully reproduced by the experiment. The quantum states of the dissociative recombination products at 0 eV collision energy have been determined; ground-state helium and excited hydrogen atoms ({ital n}=2) are dominantly formed, in agreement with recent predictions by Guberman. The dissociative excitation has an onset around 10 eV and follows the shape of the dissociative recombination cross section, illustrating that both processes start with the formation of doubly excited neutral states that lie in the ionizationmore » continuum as well as in the dissociation continuum. The dissociative excitation cross section is in quite good agreement with recent calculations by Orel and Kulander. {copyright} {ital 1996 The American Physical Society.}« less

Authors:
; ; ; ; ; ;  [1]
  1. Department of Physics I, Royal Institute of Technology (KTH), S-100 44 Stockholm (Sweden)|[Manne Siegbahn Laboratory, Stockholm University, S-104 05 Stockholm (Sweden)|[Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 (United States)|[FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam (The Netherlands)
Publication Date:
OSTI Identifier:
385691
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review A; Journal Volume: 54; Journal Issue: 4; Other Information: PBD: Oct 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HELIUM HYDRIDES; RECOMBINATION; ELECTRON-MOLECULE COLLISIONS; DISSOCIATION; HELIUM IONS; CROSS SECTIONS; EXCITED STATES; MOLECULAR IONS; GROUND STATES; IONIZATION; EV RANGE 10-100

Citation Formats

Stroemholm, C., Semaniak, J., Rosen, S., Danared, H., Datz, S., van der Zande, W., and Larsson, M. Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms. United States: N. p., 1996. Web. doi:10.1103/PhysRevA.54.3086.
Stroemholm, C., Semaniak, J., Rosen, S., Danared, H., Datz, S., van der Zande, W., & Larsson, M. Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms. United States. doi:10.1103/PhysRevA.54.3086.
Stroemholm, C., Semaniak, J., Rosen, S., Danared, H., Datz, S., van der Zande, W., and Larsson, M. Tue . "Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms". United States. doi:10.1103/PhysRevA.54.3086.
@article{osti_385691,
title = {Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms},
author = {Stroemholm, C. and Semaniak, J. and Rosen, S. and Danared, H. and Datz, S. and van der Zande, W. and Larsson, M.},
abstractNote = {Absolute cross sections have been determined for the dissociative recombination and dissociative excitation of {sup 4}HeH{sup +} for electron energies below 40 eV. The dissociative recombination cross section is in semiquantitative agreement with recent theoretical results by Sarpal, Tennyson, and Morgan [J. Phys. B {bold 27}, 5943 (1994)] and Guberman [Phys. Rev. A {bold 49}, R4277 (1994); in {ital XIXth} {ital International} {ital Conference} {ital on} {ital the} {ital Physics} {ital of} {ital Electronic} {ital and} {ital Atomic} {ital Collisions}, {ital Whistler}, {ital Canada}, AIP Conf. Proc. No. 360, edited by L. J. Dube, J. B. A. Mitchell, J. W. McConkey, and C. E. Brion (AIP, New York, 1995), p. 307]. The calculated resonant structure below a collision energy of 1 eV was not fully reproduced by the experiment. The quantum states of the dissociative recombination products at 0 eV collision energy have been determined; ground-state helium and excited hydrogen atoms ({ital n}=2) are dominantly formed, in agreement with recent predictions by Guberman. The dissociative excitation has an onset around 10 eV and follows the shape of the dissociative recombination cross section, illustrating that both processes start with the formation of doubly excited neutral states that lie in the ionization continuum as well as in the dissociation continuum. The dissociative excitation cross section is in quite good agreement with recent calculations by Orel and Kulander. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevA.54.3086},
journal = {Physical Review A},
number = 4,
volume = 54,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 1996},
month = {Tue Oct 01 00:00:00 EDT 1996}
}