FTMW SPECTROSCOPY OF $CH_{2}NC (\tilde{X}^{2}B_{1}) {\sim}$ A POSSIBLE CANDIDATE OF INTERSTELLAR MOLECULE
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Date
2004
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Ohio State University
Abstract
Cyanohydrocarbons are molecules of great importance in cold dark clouds such as TMC-1. Due to such interests, $CH_{2}CN$ has been studied by experimental and theoretical means, and these extensive investigations lead unambiguous identification of the molecule in interstellar $matter^{a}$. It turns out that an isomer $CH_{2}NC$ was rarely studied experimentally, probably because of unstableness of this species compared with $CH_{2}CN$. We recently recorded Fourier transform microwave (FTMW) spectra of $CH_{2}NC$ at the University of Tokyo. About $0.3{\sim}1$ percent of $CH_{3}NC$, synthesized by an ordinary way, was diluted in the Ar or Ne buffer gas at the pressure of ${\sim}1$ atm. The mixed gas was injected into the Fabry-P\'{e}rot cavity via a pulsed nozzle, whose opening was synchronized with high voltage dc pulse to discharge to generate the aimed species. $N=1_{10}-0_{00} ({\sim} 22.2 GHz), 2_{02}-1_{01} 2_{12}-1_{11}$, and $2_{11}-1_{10} ({\sim} 44.4 GHz)$ were recorded with well resolved fine and hyperfine structure. The molecular structure as well as a possibility of detection of this molecule will be discussed.
Description
$^{a}$W. M. IRVINE et al. Astrophys. J., 334, L107 (1988).
Author Institution: Institute for Astrophysics and Planetary Sciences, Ibaraki University; Japan Aerospace Exploration Agency (JAXA), SMILES Mission Team, Tsukuba Space Center; Department of Physics and Research Center for the Early Universe, The University of Tokyo
Author Institution: Institute for Astrophysics and Planetary Sciences, Ibaraki University; Japan Aerospace Exploration Agency (JAXA), SMILES Mission Team, Tsukuba Space Center; Department of Physics and Research Center for the Early Universe, The University of Tokyo