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Title:HINDERING AN ION-NEUTRAL REACTION USING VIBRATIONAL EXCITATION: THE ν7 ROVIBRATIONAL BAND OF c-C3H2+
Author(s):Markus, Charles R.
Contributor(s):Schlemmer, Stephan ; Brünken, Sandra ; Gauss, Jürgen ; Lipparini, Filippo ; Banhatti, Shreyak ; Schmid, Philipp C; Salomon, Thomas ; Asvany, Oskar
Subject(s):Ions
Abstract:Ion-neutral reactions often occur rapidly at Langevin rate constants of $\sim 10^{-9}$~cm$^{3}$s$^{-1}$, even at low temperatures, which is why they are able to drive the chemistry of interstellar space. The reaction C$_3$H$_2^+ +$ H$_2\rightarrow $ C$_3$H$_3^+$ + H does not follow this trend, and has been known to occur at a much slower rate of $\sim 2\times 10^{-13}$~cm$^{3}$s$^{-1}$.\footnote{I. Savi\'c and D. Gerlich, \textit{Phys. Chem. Chem. Phys.}, \textbf{7}, 1026--1035, (2005).} It was recently observed that when C$_3$H$_2^+$ ions were resonantly excited by mid-IR light in a multipole ion trap held at 8~K, they were less likely to react with H$_2$ to form C$_3$H$_3^+$. Here, possible mechanisms behind this inhibited reaction process are discussed. Additionally, this effect can be utilized as a new form of action spectroscopy by counting the number of formed product ions as a function of the excitation wavelength, which was used here to measure 91 rovibrational transitions in the $\nu_7$ asymmetric C-H stretch band of the cyclic C$_3$H$_2^+$ isomer. The new frequencies were used to determine accurate molecular constants that are compared to high-level \textit{ab initio} calculations.
Issue Date:2019-06-19
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/104286
DOI:10.15278/isms.2019.WF05
Rights Information:Copyright 2019 Charles R. Markus
Date Available in IDEALS:2019-07-15
2020-01-25


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