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Title:IR SPECTRA OF COLD PROTONATED METHANE
Author(s):Schlemmer, Stephan
Contributor(s):Potapov, Alexey; Br゚nken, Sandra; Yamada, Koichi MT; Asvany, Oskar
Subject(s):Cold/Ultracold/Matrices/Droplets
Abstract:High-resolution infrared spectra of mass selected protonated methane, chem{CH_5^+}, have been recorded in the C-H stretching region in a 22-pole ion trap experiment at low temperatures. The frequencies of the infrared OPO system (pump and signal) have been calibrated using a NIR frequency comb. As a result the ro-vibrational IR transition frequencies of chem{CH_5^+} could be determined to an accuracy in the MHz regime.footnote{O. Asvany, J. Krieg, and S. Schlemmer, Frequency comb assisted mid-infrared spectroscopy of cold molecular ions, Review of Scientific Instruments, 83 (2012), 076102.} In this contribution we discuss different techniques of laser induced reactions which enabled recording spectra at different temperatures.footnote{O. Asvany, S. Br゚nken, L. Kluge, and S. Schlemmer, COLTRAP: a 22-pole ion trapping machine for spectroscopy at 4 K, Applied Physics B: Lasers and Optics, 114 (2014), 203-211} The spectra simplify dramatically at a nominal trap temperature of 4~K. Nevertheless an assignment of these spectra is very difficult. We apply the idea of the Rydberg-Ritz combination principle to the complex spectra of protonated methane in order to get first hints at the energy level structure of this enigmatic molecule.
Issue Date:25-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79101
Date Available in IDEALS:2016-01-05


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