Universität zu Köln

Savic, Igor ORCID: 0000-0002-9954-7457, Gerlich, Dieter, Asvany, Oskar, Jusko, Pavol and Schlemmer, Stephan ORCID: 0000-0002-1421-7281 (2015). Controlled synthesis and analysis of He-H-3(+) in a 3.7 K ion trap. Mol. Phys., 113 (15-16). S. 2320 - 2333. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1362-3028

Full text not available from this repository.

Abstract

Complexes of the triatomic hydrogen ion with helium were synthesised in a low-temperature 22-pole rf ion trap at He number densities of up to 10(16) cm(-)(3). Absolute ternary rate coefficients for sequentially attaching He atoms have been determined from the growth of complexes with increasing storage time. The number of helium-tagged ions is significantly reduced when increasing the nominal temperature from 4 to 25 K. Competition between attachment and dissociation via collisions leads to stationary He-n-H-3(+) (n up to 9) distributions. State-specific excitation of the trapped H-3(+) ions via IR transitions significantly reduces the formation of complexes. Tuning the laser to Delta v(2) = 1 transitions in the range of 2726 cm(-)(1) leads to LIICG lines, i.e., to spectra caused by laser-induced inhibition of complex growth. In addition, almost 100 lines have been found between 2700 and 2765 cm(-)(1), which are attributed to laser-induced dissociation of the in situ formed He-H-3(+) complex ions. These lines are not yet assigned; however, their absorption strength, statistics and predissociation lifetimes provide interesting information on both the stable complexes as well as on scattering resonances in low-energy H-3(+)+He collisions. New calculations of the potential energy surface will help to analyse the dissociation spectrum. There are some indications that para-H-3(+) is enriched under the conditions of the present experiment.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Savic, Igor UNSPECIFIED orcid.org/0000-0002-9954-7457 UNSPECIFIED Gerlich, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED Asvany, Oskar UNSPECIFIED UNSPECIFIED UNSPECIFIED Jusko, Pavol UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-396320
DOI:	10.1080/00268976.2015.1037802
Journal or Publication Title:	Mol. Phys.
Volume:	113
Number:	15-16
Page Range:	S. 2320 - 2333
Date:	2015
Publisher:	TAYLOR & FRANCIS LTD
Place of Publication:	ABINGDON
ISSN:	1362-3028
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LASER-INDUCED REACTIONS; INFRARED-SPECTROSCOPY; ELECTRONIC-SPECTRA; H-3(+); GAS; TEMPERATURE; CHEMISTRY; COLD; COLLISIONS; COMPLEXES Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/39632