Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confewj08c&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Physics
Radicals And Ions
Scientific paper
The chemical reaction H_3^+ + H_2 → H_2 + H_3^+ is the simplest bimolecular reaction involving a polyatomic, and is possibly the most common such process occurring in the universe. Recent measurements of interstellar clouds have shown that the temperatures derived from the lowest rotational levels of H_2 and H_3^+ do not agree, and it is expected that this reaction plays a key role in this deviation. To investigate this process, we have measured the ortho/para ratio of H_3^+ produced in this reaction by performing high resolution spectroscopy on its ν_2 fundamental band in plasmas formed from various mixtures of ortho and para H_2. These measurements have been performed in a supersonic expansion discharge source and in a cooled hollow cathode cell to probe the reaction at a variety of temperatures at and below 300 K. Our results provide experimental evidence that the population distribution of the lowest levels of H_3^+ is governed by the steady state of the H_3^+ + H_2 → H_2 + H_3^+ reaction, not by thermalization.
Crabtree Kyle N.
Kauffman Carrie A.
McCall Benjamin J.
Tom Brian A.
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