IR SPECTRA OF COLD PROTONATED METHANE

Schlemmer, Stephan

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https://hdl.handle.net/2142/79101 Copy

Description

Title

IR SPECTRA OF COLD PROTONATED METHANE

Author(s)

Schlemmer, Stephan

Contributor(s)

• Potapov, Alexey
• Brünken, Sandra
• Yamada, Koichi M.T.
• Asvany, Oskar

Issue Date

25-Jun-15

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79101

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