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Mobility of He+ ions in helium gas

Lookup NU author(s): Professor Alan Dickinson

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Abstract

Recent values for the X 2Σu+ and A 2Σg+ He2+ potentials have been used to determine quantal phase shifts. These phase shifts have been used to compute transport cross sections that are highly accurate over a wide range of energy. A Gram-Charlier treatment of the Boltzmann kinetic equation has been used to calculate from the cross sections the mobility of He+ ions in He gas at temperatures of 2, 4.35, 5, 6, 77, 85 and 300 K for E/N values up to ≈ 40 Td, where E is the electric field strength and N is the gas number density. Excellent agreement is obtained with experimental values at 77 and 300 K. Differences of up to 4% are obtained with experiment at 4.35 K, supporting a suggestion that there may be additional uncertainties in the pressure measurements employed in this experiment. The 85 K observations are between 4% and 6% below our calculations, a somewhat larger difference than the quoted experimental uncertainty. Excellent agreement is obtained with the transverse diffusion coefficient measurements at 294 K.

Publication metadata

Author(s): Dickinson AS, Lee MS, Viehland LA

Publication type: Article

Publication status: Published

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Year: 1999

Volume: 32

Issue: 20

Pages: 4919-4930

Print publication date: 28/10/1999

ISSN (print): 0953-4075

ISSN (electronic): 1361-6455

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-4075/32/20/309

DOI: 10.1088/0953-4075/32/20/309

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