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Title: Dissociative recombination of H{sub 2}{sup +}: Product state information and very large cross sections of vibrationally excited H{sub 2}{sup +}

Abstract

We report experiments on dissociative recombination (DR) of HD{sup +} and H{sub 2}{sup +}. Product state information has been obtained over a wide range of electron energies with a position sensitive detector consisting of a graded absorber in combination with a surface-barrier detector. At low electron energies ({lt}3 eV) hydrogen atoms are formed preferentially in highly excited states ({ital n}{gt}2); at high electron energies ({gt}12 eV) both hydrogen fragments are excited. The dissociative recombination rate of H{sub 2}{sup +} has been measured also as a function of storage time in the energy range of 0 eV to 20 eV. We show that the H{sub 2}{sup +} beam is still vibrationally excited after 20 s at our experimental conditions. The H{sub 2}{sup +} ions relax vibrationally through interaction with electrons in the electron cooler. Vibrationally excited levels ({ital v}{ge}5) have DR rates that exceed the DR rate of the lower vibrational levels by two orders of magnitude. The latter observation has important consequences for the interpretation of previous DR experiments on H{sub 2}{sup +}. {copyright} {ital 1996 The American Physical Society.}

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Physics Department I, The Royal Institute of Technology, S-100 44 Stockholm, Sweden FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 Manne Siegbahn Laboratory at Stockholm University, S-104 05 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
401138
Resource Type:
Journal Article
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 54; Journal Issue: 6; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HYDROGEN IONS 2 PLUS; DISSOCIATION; RECOMBINATION; ELECTRON-MOLECULE COLLISIONS; HYDROGEN DEUTERIDE; CROSS SECTIONS; VIBRATIONAL STATES; EXCITATION; EV RANGE 01-10; MOLECULAR IONS; EXCITED STATES

Citation Formats

van der Zande, W J, Semaniak, J, Zengin, V, Sundstroem, G, Rosen, S, Stroemholm, C, Datz, S, Danared, H, and Larsson, M. Dissociative recombination of H{sub 2}{sup +}: Product state information and very large cross sections of vibrationally excited H{sub 2}{sup +}. United States: N. p., 1996. Web. doi:10.1103/PhysRevA.54.5010.
van der Zande, W J, Semaniak, J, Zengin, V, Sundstroem, G, Rosen, S, Stroemholm, C, Datz, S, Danared, H, & Larsson, M. Dissociative recombination of H{sub 2}{sup +}: Product state information and very large cross sections of vibrationally excited H{sub 2}{sup +}. United States. doi:10.1103/PhysRevA.54.5010.
van der Zande, W J, Semaniak, J, Zengin, V, Sundstroem, G, Rosen, S, Stroemholm, C, Datz, S, Danared, H, and Larsson, M. Sun . "Dissociative recombination of H{sub 2}{sup +}: Product state information and very large cross sections of vibrationally excited H{sub 2}{sup +}". United States. doi:10.1103/PhysRevA.54.5010.
@article{osti_401138,
title = {Dissociative recombination of H{sub 2}{sup +}: Product state information and very large cross sections of vibrationally excited H{sub 2}{sup +}},
author = {van der Zande, W J and Semaniak, J and Zengin, V and Sundstroem, G and Rosen, S and Stroemholm, C and Datz, S and Danared, H and Larsson, M},
abstractNote = {We report experiments on dissociative recombination (DR) of HD{sup +} and H{sub 2}{sup +}. Product state information has been obtained over a wide range of electron energies with a position sensitive detector consisting of a graded absorber in combination with a surface-barrier detector. At low electron energies ({lt}3 eV) hydrogen atoms are formed preferentially in highly excited states ({ital n}{gt}2); at high electron energies ({gt}12 eV) both hydrogen fragments are excited. The dissociative recombination rate of H{sub 2}{sup +} has been measured also as a function of storage time in the energy range of 0 eV to 20 eV. We show that the H{sub 2}{sup +} beam is still vibrationally excited after 20 s at our experimental conditions. The H{sub 2}{sup +} ions relax vibrationally through interaction with electrons in the electron cooler. Vibrationally excited levels ({ital v}{ge}5) have DR rates that exceed the DR rate of the lower vibrational levels by two orders of magnitude. The latter observation has important consequences for the interpretation of previous DR experiments on H{sub 2}{sup +}. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevA.54.5010},
journal = {Physical Review A},
number = 6,
volume = 54,
place = {United States},
year = {1996},
month = {12}
}