Description of light-induced drift in terms of transport mean paths

Autor:	Pavel L. Chapovsky, J J M Beenakker, L. J. F. Hermans, I Kuscer, G J van der Meer
Rok vydání:	1993
Předmět:	Physics Formalism (philosophy of mathematics) Drift velocity Buffer gas Light induced Atomic physics Condensed Matter Physics Collision Atomic and Molecular Physics and Optics Excitation Molecular gases Computational physics Collision rate
Zdroj:	Journal of Physics B: Atomic, Molecular and Optical Physics. 26:2837-2852
ISSN:	1361-6455 0953-4075
DOI:	10.1088/0953-4075/26/17/017
Popis:	Light-induced drift is often described in terms of a change Delta nu in the collision rate (or of the transport collision rate) caused by optical excitation of atoms or molecules immersed in a buffer gas. One assumes (at least tacitly) that the collision rates are independent of velocity, though this is true only for heavy particles in a light buffer gas. The recently observed anomalous light-induced drift of molecular gases suggests using a speed-dependent Delta nu which, however, is difficult to justify. The formulation in terms of speed-dependent transport mean paths, proposed here, is free of such ambiguities. For molecules a Wang-Chang-Uhlenbeck-de Boer multilevel formalism leads to extended transport mean paths, whereupon anomalous light-induced drift can be interpreted in a plausible way.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0966e1f029f4747b676c30cd4fba71a9 https://doi.org/10.1088/0953-4075/26/17/017 Zobrazit plný text záznamu