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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: 2019-07-152020-01-25
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