Transfer of a proton between H 2 and O 2

Author:

Kluge Lars1,Gärtner Sabrina1,Brünken Sandra1,Asvany Oskar1,Gerlich Dieter2,Schlemmer Stephan1

Affiliation:

1. I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany

2. Department of Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany

Abstract

The proton affinities of hydrogen and oxygen are very similar. Therefore, it has been discussed that the proton transfer from the omnipresent H to molecular oxygen in the near thermoneutral reaction effectively binds the interstellar oxygen in O 2 H + . In this work, the proton transfer reaction has been investigated in a low-temperature 22-pole ion trap from almost room temperature (280 K) down to the lowest possible temperature limited by freeze out of oxygen gas (about 40 K at a low pressure). The Arrhenius behaviour of the rate coefficient for the forward reaction shows that it is subject to an activation energy of E A / k =113 K. Thus, the forward reaction can proceed only in higher temperature molecular clouds. Applying laser-induced reactions to the given reaction (in the backward direction), a preliminary search for spectroscopic signatures of O 2 H + in the infrared was unsuccessful, whereas the forward reaction has been successfully used to probe the population of the lowest ortho and para levels of H .

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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1. Laboratory spectroscopy for astrophysics: Festschrift for Stephan Schlemmer;Journal of Molecular Spectroscopy;2021-05

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3. Infrared photodissociation spectroscopy and anharmonic vibrational study of the HO4+ molecular ion;The Journal of Chemical Physics;2020-05-07

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