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High-resolution measurements of the integral cross-section for the reaction Ar++H2→ArH++H as a function of the collision energy

✍ Scribed by Paolo Tosi; Franco Boldo; Fausto Eccher; Mauro Filippi; Davide Bassi

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
347 KB
Volume
164
Category
Article
ISSN
0009-2614

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✦ Synopsis

A continuous, supersonic molecular beam is crossed at 90" with a radio-frequency guided ion beam in a tandem mass spectrometer. This experimental configuration makes possible measurements of the integral reactive cross-section as a functton ofcollision energy with a much higher energy resolution with respect to previous experiments. For the reaction of Ar' with H2 to form ArH+ a new feature is observed at a collision energy of about 0.05 eV. This is interpreted as a change in the reaction mechanism. When averaged over the appropriate thermal distribution our results are in good agreement with published values obtained in experiments using a room-temperature scattering cell.

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