14. I. F. Schneider, A. Suzor‐Weiner, Channel‐Mixing Effects on Dissociative Recombination

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Volume 13: Pages 280-289, 2000

ChannelMixing Effects on Dissociative Recombination

I. F. Schneider 1,2, A. SuzorWeiner 3,4

1Laboratoire de Mécanique, Université du Havre, F76058 Le Havre, France

2National Institute for Lasers, Plasma and Radiation Physics, BucharestMăgurele, Romania

3Laboratoire de Photophysique Moléculaire, Université ParisSud, F91405 Orsay, France

4Laboratoire de Chimie Physique, 11 rue Pierre et Marie Curie, F75234 Paris, France

Configuration interaction has been known to cause resonance structures in atomic photoionization spectra and electronscattering cross sections since 1961 [U. Fano, Phys. Rev. 124, 1866 (1961)]. Generalized in terms of channel mixing and expressed in the framework of multichannel quantum defect theory, it applies also to molecular spectra and dissociative processes, in particular to dissociative recombination. We show here that besides causing resonances, channel mixing can in some cases make the dissociative recombination process possible, while at first view it should not happen due to the absence of direct coupling between the entrance channel (electronic continuum) and the exit channel (nuclear continuum).

Keywords: dissociative recombination, configuration interaction, channel mixing, multichannel quantum defect theory, molecular Rydberg states, resonances, indirect processes

Received: September 1, 2000; Published online: December 15, 2008