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Title: Vibrational relaxation and dissociative recombination of H{sub 2}{sup +} induced by slow electrons

We present calculations of cross sections and rate coefficients for the dissociative recombination of H{sub 2}{sup +} ions initially in v=0-6 vibrational levels, together with rate coefficients for the competing electron-induced vibrational deexcitation. We used the multichannel quantum defect theory with a second-order treatment of the K matrix, and show that electronic interactions dominate not only the dissociative recombination but also the vibrational relaxation induced by slow electrons. Most of our rate coefficients for dissociative recombination are in good agreement with the measurements at the TSR storage ring [S. Krohn et al., Phys. Rev. A 62, 032713 (2000)]. On the contrary, our rates for vibrational deexcitation, close to former results obtained by R-matrix calculations [B. K. Sarpal and J. Tennyson, Mon. Not. R. Astron. Soc. 263, 909 (1993)], are smaller by up to one order of magnitude than the experimental values which are deduced from the time evolution of the vibrational populations, measured by the Coulomb explosion imaging method.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7]
  1. Laboratoire de Photophysique Moleculaire, Universite Paris-Sud, Bat. 210, F-91405 Orsay, (France)
  2. (CEPAMOQ), Universite de Douala, BP 24157 Douala, (Cameroon)
  3. Centre de Physique Atomique Moleculaire et Optique Quantique (CEPAMOQ), Universite de Douala, BP 24157 Douala, (Cameroon)
  4. (Romania)
  5. Foundation of Computer Science Laboratory, University of Aizu, Ikki, Aizuwakamatsu 965-8580, (Japan)
  6. Laboratoire de Mecanique, Physique et Geosciences, Universite du Havre, F-76058 Le Havre, (France)
  7. (France)
Publication Date:
OSTI Identifier:
20640178
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 68; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.68.032704; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CROSS SECTIONS; DISSOCIATION; ELECTRON-MOLECULE COLLISIONS; ELECTRONS; ENERGY TRANSFER; EXCITATION; HYDROGEN IONS 2 PLUS; K MATRIX; R MATRIX; RECOMBINATION; RELAXATION; TSR STORAGE RING; VIBRATIONAL STATES