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The interaction of ions with nonpolar neutrals: The collision broadening of ion cyclotron resonance lines of ions in hydrogen and methane

Ridge, D. P. and Beauchamp, J. L. (1976) The interaction of ions with nonpolar neutrals: The collision broadening of ion cyclotron resonance lines of ions in hydrogen and methane. Journal of Chemical Physics, 64 (7). pp. 2735-2746. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:RIDjcp76

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Abstract

The motion of ions in an ion cyclotron resonance cell is considered, and measurements of ion cyclotron resonance linewidths are described. The connection between cyclotron resonance linewidths and kinetic parameters is developed. Mobilities and collision frequencies of CH<sub>5</sub><sup> + </sup>, C2H<sub>5</sub><sup> + </sup>, C3H<sub>7</sub><sup> + </sup>, C4H<sub>9</sub><sup> + </sup>, and Na + in methane and H + , H<sub>3</sub><sup> + </sup>, H30 + , CH<sub>5</sub><sup> + </sup>, C2H<sub>5</sub><sup> + </sup>, C3H<sub>7</sub><sup> + </sup>, and Na + in hydrogen are determined from the linewidth measurements. Resulting mobilities of H + , H<sub>3</sub><sup> + </sup>, and Na + in H2 are found to agree well with drift tube measurements, in contrast to previous cyclotron resonance linewidth determinations. The mobilities are interpreted in terms of three model ion molecule interaction potentials. The mobilities are found to be in general consistent with both a three term 12–6–4 potential and an acentric potential but not with the simple polarization potential. Potential parameters consistent with binding energies from the literature and the present mobility measurements are reported for H<sub>3</sub><sup> + </sup>–H2, CH<sub>5</sub><sup> + </sup>–CH4, and C2H<sub>5</sub><sup> + </sup>–CH4.


Item Type:Article
Additional Information:Copyright © 1976 American Institute of Physics. (Received 26 June 1974) This research was supported in part by Atomic Energy Commission Grant No. AT(04-3)767-8. D.P. Ridge wishes to acknowledge the donors of the Petroleum Research Foundation administered by the American Chemical Society and University of Delaware Research Foundation for partial support of this research. [D.P.R. was an] NDEA Predoctoral Fellow 1971-1972. [J.L.B. was a] Dreyfus Teacher Scholar 1971-1975.
Record Number:CaltechAUTHORS:RIDjcp76
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:RIDjcp76
Alternative URL:http://dx.doi.org/10.1063/1.432596
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10684
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:03 Jun 2008
Last Modified:26 Dec 2012 10:03

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