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Collision spectroscopy of ion-diatom systems: He/sup +/-N/sub 2/ and -O/sub 2/ at medium energies

Journal Article · · Phys. Rev. A; (United States)
; ; ; ; ;
Energy-loss measurements of direct-excitation and electron-capture processes are performed for the He/sup +/-N/sub 2/, -O/sub 2/ collisional systems in the 0.2--4-keV energy range and in the 0/sup 0/--3/sup 0/ angular range. Pure vibrational excitation and vibrational excitation in excited electronic states are studied using a high-resolution spectrometer (100 meV). Pure vibrational excitation is always found to be a weak process. The analysis of vibrational distributions in excited states strongly supports an interpretation in terms of the Franck-Condon principle. Relative probabilities as functions of energy and angle are reported for the identified excitation and electron-capture processes. The results show the importance of electron-capture processes among which quasiresonant and endothermic processes dominate exothermic processes. The striking resemblance of the present data with those available on the He/sup +/--rare-gas systems conveys a similar quasimolecular interpretation of the collision mechanisms.
Research Organization:
Laboratoire des Collisions Atomiques et Moleculaires, Baiment 351, Universite Paris-Sud, 91405 Orsay Cedex, France
OSTI ID:
6266567
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 24:5; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CAPTURE
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY LEVELS
ENERGY LOSSES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 100-1000
EXCITATION
EXCITED STATES
HELIUM IONS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
LOSSES
MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXYGEN
VIBRATIONAL STATES