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Ionization of low-Rydberg-state He atoms by polar molecules. I. Velocity dependence of the cross sections

Journal Article · · Phys. Rev. A; (United States)
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The ionization of low-Rydberg-state He atoms in the n /sup 1/P state (n = 14) in collisions with the polar molecules NH/sub 3/, SO/sub 2/, and acetone (C/sub 3/H/sub 6/O) is carried out in a crossed-beam experiment at thermal kinetic energies. The dependence of the experimental ionization cross sections sigma/sub i//sup expt/ on the relative velocity of the reactants is obtained by a time-of-flight method. We observe that it varies mainly as 1/v/sub r//sup 2/ in a large part of the studied velocity range, while a 1/v/sub r/ velocity dependence is predicted by the free-electron model for the higher Rydberg levels.
Research Organization:
Service de Physique des Atomes et des Surfaces, Centre d'Etudes Nucleaires de Saclay, 91191 Gif-sur-Yvette Cedex, France
OSTI ID:
6672508
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:9; 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
AMMONIA
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BEAMS
CHALCOGENIDES
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDRIDES
HYDROGEN COMPOUNDS
IONIZATION
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
RYDBERG STATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TIME-OF-FLIGHT METHOD