Universität zu Köln

Kluge, Lars, Gaertner, Sabrina, Bruenken, Sandra, Asvany, Oskar, Gerlich, Dieter and Schlemmer, Stephan ORCID: 0000-0002-1421-7281 (2012). Transfer of a proton between H-2 and O-2. Philos. Trans. R. Soc. A-Math. Phys. Eng. Sci., 370 (1978). S. 5041 - 5055. LONDON: ROYAL SOC. ISSN 1471-2962

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Abstract

The proton affinities of hydrogen and oxygen are very similar. Therefore, it has been discussed that the proton transfer from the omnipresent H-3(+) to molecular oxygen in the near thermoneutral reaction H-3(+) + O-2 reversible arrow O2H+ + H-2 effectively binds the interstellar oxygen in O2H+. 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 40K 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 O2H+ 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-3(+).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kluge, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED Gaertner, Sabrina UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruenken, Sandra UNSPECIFIED UNSPECIFIED UNSPECIFIED Asvany, Oskar UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerlich, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-478987
DOI:	10.1098/rsta.2012.0170
Journal or Publication Title:	Philos. Trans. R. Soc. A-Math. Phys. Eng. Sci.
Volume:	370
Number:	1978
Page Range:	S. 5041 - 5055
Date:	2012
Publisher:	ROYAL SOC
Place of Publication:	LONDON
ISSN:	1471-2962
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LASER-INDUCED REACTIONS; SELECTION-RULES; OVERTONE BAND; ION-TRAP; H-3(+); DEPENDENCE; 3-NU-2; C2H2+ Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47898