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Title:ROTATIONAL ACTION SPECTROSCOPY VIA STATE-SELECTIVE HELIUM ATTACHMENT
Author(s):Schlemmer, Stephan
Contributor(s):Asvany, Oskar; Br゚nken, Sandra; Stoffels, Alexander; Kluge, Lars
Subject(s):Ions
Abstract:Helium atoms can attach to molecular cations via ternary collision processes forming weakly bound ($approx 1$ kcal/mol) He-M$^+$ complexes. We developed a novel sensitive action spectroscopic scheme for molecular ions based on an observed rotational state dependency of the He attachment process [1]. A detailed account of the underlying kinetics will be presented on the example of the CD$^+$ ion, where our studies indicate a decrease of around 50% for the rotational state dependent ternary He attachment rate coefficient of the $J=1$ level with respect to the $J=0$ level. Experiments are performed on mass-selected ions stored in a temperature-variable ($Tgeq 3.9$~K) cryogenic rf 22-pole ion trap in the presence of a high number density of He ($approx 10^{15}$ cm$^{-3}$) [2]. Rotational spectra of the bare ions are recorded by measuring the change in the number of formed He-M$^+$ complexes after a certain storage time as a function of excitation wavelength. Here we will also present the first measurements of the rotational ground state transitions of CF$^+$ ($J=1-0$, hfs resolved) and NH$_3$D$^+$ ($J_K=1_0-0_0$), recorded in this way.\ noindent [1] Br\"{u}nken et al., ApJL {bf 783}, L4 (2014) \ noindent [2] Asvany et al., Applied Physics B {bf 114}, 203 (2014)
Issue Date:22-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79364
Date Available in IDEALS:2016-01-05


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