HIGH-RESOLUTION IR ACTION SPECTRUM OF C$_2$H$_2^+$
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Date
2011
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Publisher
Ohio State University
Abstract
The method of Laser-Induced-Reactions (LIR), which is described in detail in Schlemmer et al. 2002 nderline{\textbf{117}}(2068-2075), 2002}, is used to obtain high-resolution infrared spectra of molecular ions. % Here, the endothermic reaction C$_2$H$_2^+$~+~H$_2~\rightarrow$~C$_2$H$_3^+$~+~H is promoted by ro-vibrational excitation of the parent ion. A spectrum of the $\nu_3$ stretching vibration of C$_2$H$_2^+$ is recorded by variation of the wavelength of a home-build OPO (Optical Parametric Oscillator) operating in the 3 micron region. % The experiments are carried out in a low temperature 22-pole ion trap where several hundred cold, mass selected parent ions are stored. Typical linewidths of the action spectra are 3~$\times$~10$^{-3}$~cm$^{-1}$. First spectra for C$_2$H$_2^+$ and their analysis will be presented. Other possible applications of LIR spectroscopy will be discussed.
Description
Author Institution: I. Physikalisches Institut, Universitat zu Koln