Experimental Measurements of the H3+ + H2 → H3+ + H2 Reaction in a Hollow Cathode

Details Experimental Measurements of the H3+ + H2 → H3+ + H2 Reaction in a Hollow Cathode Experimental Measurements of the H3+ + H2 → H3+ + H2 Reaction in a Hollow Cathode

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mwac.meet..p06k&link_type=abstract

"Midwest Astrochemistry Meeting 2010, held 5-6 November at the University of Illinois at Urbana-Champaign. http://midwest.astroc

Astronomy and Astrophysics

Astronomy

Scientific paper

Hydrogen is the most abundant element in the universe and as a result, molecular hydrogen and the H3+ ion play a pivotal role in interstellar chemistry. Like H2, H3+ exists in two nuclear spin configurations, ortho (I = 3/2) and para (I = 1/2), which are unique molecules that can only interconvert through a chemical reaction. The reaction between these species, H3+ + H2 → H3+ + H2, is the dominant means by which the nuclear spin of H3+ can be changed. It is also the most commonly occuring bimolecular reaction in the universe, and therefore it is important to understand how this reaction influences the ortho/para ratio of H3+ .
We have studied the nuclear spin dependence of the H3+ + H2 proton-scrambling reaction by probing ν2 fundamental band of H3+ using multipass direct absorption spectroscopy. We have monitored the ortho/para ratio of H3+ in a variety of hydrogenic plasmas consisting of different ortho/para-H2 ratios. To deduce the temperature dependence of this reaction, we have performed these experiements in an uncooled hollow cathode and, for the first time at low temperature, in a liquid nitrogen cooled hollow cathode. Finally, we have also studied the pressure dependence of the chemistry in order to elucidate any three-body processes that may be occuring in our plasmas.

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