Wave-packet approach to Rydberg resonances in dissociative recombination

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.042702· OSTI ID:21020722

Morisset, Sabine; Pichl, Lukas; Orel, Ann E; Schneider, Ioan F ^[1]

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1. Laboratoire des Interactions Ioniques et Moleculaires, Universite de Provence - Centre National de la Recherche Scientifique, Centre Saint-Jerome, Equipe SdM, Service 242, 13397 Marseille cedex 20 (France)

We report the time-dependent approach to resonant electron capture into Rydberg states in collisions with molecular cations at low impact energy, as an alternative to the method based on multichannel quantum defect theory (MQDT), and present the results for the HD{sup +} ion. The propagation of the initial wave function on 13 Rydberg states (besides one valence state) correctly describes the indirect dissociative recombination mechanism in the time domain. Notably, the nonlocal coupling operator between the ionization and dissociation channels is accounted for in the indirect process, extending previous work on the case of direct coupling. The present approach compares to the MQDT framework with remarkable precision: resonant structures in the cross section correctly emerge from the wave-packet propagation; the time-dependent result also forms a cross section envelope for the dense series of ultrafine MQDT resonances corresponding to the quasicontinuous part of the Rydberg state manifold.

• OSTI ID: 21020722
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
COMPARATIVE EVALUATIONS
COUPLING
CROSS SECTIONS
DISSOCIATION
ELECTRON CAPTURE
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
HYDROGEN IONS
IONIZATION
QUANTUM MECHANICS
RECOMBINATION
RESONANCE
RYDBERG STATES
TIME DEPENDENCE
WAVE FUNCTIONS
WAVE PACKETS
WAVE PROPAGATION