Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/98453
Title: Transverse diffusion measurements and comparisons with Monte Carlo simulation and Gram-Charlier calculations for Cs+ ions drifting in He gas
Authors: Li, M.M.
Ong, P.P. 
Zhou, Z.L.
Issue Date: 15-Jun-1997
Source: Li, M.M.,Ong, P.P.,Zhou, Z.L. (1997-06-15). Transverse diffusion measurements and comparisons with Monte Carlo simulation and Gram-Charlier calculations for Cs+ ions drifting in He gas. Journal of Chemical Physics 106 (23) : 9547-9550. ScholarBank@NUS Repository.
Abstract: The ratio of the transverse diffusion coefficient to the mobility, DT/K, has been experimentally determined for Cs+ ion drifting in He gas at E/N (electric field to neutral gas number density ratio) values ranging from 5 to 140 Td. Results at 303 K are reported with an overall accuracy of ± 4%. The DT/K results were effectively corrected for longitudinal end effects existing in the drift tube. In addition, Monte Carlo simulation (MCS) calculations were made for the mobility and transport coefficients using the Koutselos, Mason, and Viehland (KMV) interaction potential as input. Comparisons of MCS results and available kinetic theory's Gram-Charlier results with the present and previous experimental data give an indication of the validity and accuracy of the present potential. The theoretical results did not reproduce the experimental curve very well, suggesting that the proposed potential for the Cs+ -He pair should be modified. Further comparisons of the transverse and longitudinal diffusion coefficients indicate that the Gram-Charlier approach of kinetic theory is quite accurate even for the large ion-neutral mass ratio. © 1997 American Institute of Physics.
Source Title: Journal of Chemical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/98453
ISSN: 00219606
Appears in Collections:Staff Publications

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