UNSPECIFIED (1994) COLLISIONAL ACTIVATION OF LARGE IONS - ENERGY-LOSSES AND AN IMPULSIVE COLLISION-THEORY OF ENERGY-TRANSFER. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 90 (2). pp. 239-247. ISSN 0956-5000

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Abstract

The translational energy losses, Delta E, experienced by keV beams of singly charged ions of high masses (> 1000 u) in collisions with either an inert-gas atom or hydrogen molecule depend on the mass of the target gas employed. There is no evidence of a dependence on the ionisation energy of the target gas. Delta Es are similar with He and D-2 targets, and both are larger than those with Ar. This behaviour is found with organic ions composed of light atoms and with inorganic cluster ions composed of heavy atoms. The measured Delta Es are consistent with internal energy uptake, Q, occurring via direct momentum transfer in an impulsive collision. It is concluded that the Q taken up by an ion is dependent upon the masses of its constituent atoms. In collision with He, a light-atom ion of a given molecular mass takes up more Q than does a heavy-atom ion of similar molecular mass under the same experimental conditions, but the Delta E can be similar in the two cases.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS
Publisher:	ROYAL SOC CHEMISTRY
ISSN:	0956-5000
Date:	21 January 1994
Volume:	90
Number:	2
Number of Pages:	9
Page Range:	pp. 239-247
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/20835

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