Effect of the relative velocity on the collision dipole in a pair of atoms

Journal Article · Mon Aug 01 00:00:00 EDT 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.445930· OSTI ID:5960121

Humbert, J; Galatry, L

It is shown that the dispersive collision induced dipole in a pair of atoms is dependent on the relative velocity of the partners. Two formulations taking into account this effect are successively presented. In the first one, the origin of the induced dipole lies in the energy coupling between the fluctuating instantaneous dipole of an atom and the reaction field due to the presence of the neighbor; the effect of the relative velocity is introduced through a Fourier expansion of the time dependent internuclear distance. The second method is based on the consideration of the secular equation for approximate instantaneous normal modes of the whole system. In the two cases, the vanishing velocity limit allows to find again a known result. For a nonzero relative velocity, a limited expansion is obtained and the two lowest order terms are given. Order of magnitude of the effects are estimated in a model of harmonic oscillators.

• Research Organization: Laboratoire de Physique Moleculaire, Universite de Besancon, 25030 Besancon Cedex, France
• OSTI ID: 5960121
• Journal Information: J. Chem. Phys.; (United States), Vol. 79:3
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM-ATOM COLLISIONS
DIPOLE MOMENTS
DIPOLES
HARMONIC OSCILLATORS
POLARIZABILITY
VELOCITY
ATOM COLLISIONS
COLLISIONS
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
MULTIPOLES
OSCILLATORS
PHYSICAL PROPERTIES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena