✦ LIBER ✦

Energy partitioning in hyperthermal O+ + H2O charge-transfer collisions

✍ Scribed by Rainer D. Dressler; Richard H. Salter; Edmond Murad

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 694 KB
Volume: 204
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85613-s

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✦ Synopsis

The energy partitioning in hyperthermal O+ +HzO charge-transfer collisions is determined from the analysis of guided-ion beam time-of-flight measurements. The experimentally determined H,O+ laboratory velocity distributions exhibit a main band due to near-thermal ions and a weak channel due to center-of-mass backscattered ions. The velocity distributions are fit to simulated distributions based on an osculating complex model. The charge-transfer products formed via the shortest lived complexes exhibit little translational-to-internal energy transfer, resulting in internal energies of 1 .O & 0.2 eV. Contributions due to longerlived complexes are observed and result in increased internal excitation. The internal energy distribution is, however, non-statistical because the lifetime of these complexes is considerably shorter than their rotational period.

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