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Analysis of physical observables and approximate distribution functions for drifting linear ions

TitleAnalysis of physical observables and approximate distribution functions for drifting linear ions
Publication TypeJournal Article
Year of Publication2001
AuthorsBaranowski, R, Thachuk, M
JournalPhysical Review A
Volume64
Pagination13
Date PublishedDec
Type of ArticleArticle
ISBN Number1050-2947
KeywordsATOMIC GASES, COLLISIONAL ALIGNMENT, DYNAMICS, MOLECULES, ROTATIONAL ALIGNMENT, SCATTERING, SUPERSONIC EXPANSIONS, SYSTEMS, TRANSPORT-COEFFICIENTS, VELOCITY DISTRIBUTIONS
Abstract

The accuracy of two recently proposed approximate distribution functions for drifting linear ions [R. Baranowski and M. Thachuk, Phys. Rev. A 63, 032503 (2001) is tested at a number of levels of microscopic detail. Through formal mathematical manipulations. low-order expressions are derived for a number of physical observables, including the angular momentum dependence of the drift velocity, and parallel and perpendicular translational temperatures. as well as the dependence of the quadrupolar alignment parameter on the parallel and perpendicular velocity components. Finally, comparisons are made between the approximate forms and basis set expansions of the distribution function utilized in formal solutions of the Boltzmann equation, with the goal of suggesting general features of these basis sets that might help improve convergence.

URL<Go to ISI>://000172608200050