Further measurements of the H+3( v =0,1,2) dissociative recombination rate coefficient

A new flowing afterglow apparatus that utilizes a Langmuir probe/mass spectrometer to monitor both electron and ion decay in a hydrogen plasma has been used to measure the dissociative recombination rate coefficient of H+3 at two different electron temperatures. At 300 K a rate coefficient of 1.5×10...

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Bibliographic Details
Published in:The Journal of chemical physics 1992-07, Vol.97 (2), p.1028-1037
Main Authors: Canosa, A., Gomet, J. C., Rowe, B. R., Mitchell, J. B. A., Queffelec, J. L.
Format: Article
Language:English
Subjects:
Astrophysics
Chemical Physics
Instrumentation and Methods for Astrophysic
Physics
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Summary:A new flowing afterglow apparatus that utilizes a Langmuir probe/mass spectrometer to monitor both electron and ion decay in a hydrogen plasma has been used to measure the dissociative recombination rate coefficient of H+3 at two different electron temperatures. At 300 K a rate coefficient of 1.5×10−7 cm3 s−1 was found for H+3 ions with a low degree of vibrational excitation (v≤2). The rate coefficient for ground state ions H+3(v=0) was measured as 1.1×10−7 cm3 s−1 at 650 K. A discussion is given of the excitation states of H+3 ions in the afterglow in the light of slow deexcitation rates for low vibrational states. A new model for the recombination of H+3 is presented.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.463282