INFRARED LASER SPECTROSCOPY OF THE $C_{2}H$ RADICAL

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 Title: INFRARED LASER SPECTROSCOPY OF THE $C_{2}H$ RADICAL Creators: Yan, W.- B.; Amano, T. Issue Date: 1991 Publisher: Ohio State University Abstract: A $^{2}\Pi-^{2}\Sigma$ band of gas phase $C_{2}H$ centered at 2928 $cm^{-1}$ is observed using a high resolution difference-frequency laser spectrometer. The $C_{2}H$ molecules were produced in a hollow cathode discharge in a mixture of $C_{2}H_{2}$ ($\sim 15$ m Torr), $H_{2} (\sim 0-150 mTorr)$, and He $(\sim 700 mTorr)$. Measurements were carried out using discharge modulation method at 3 kHz with a current of about 800 mA. Total laser pathlength was 36 m in a White cell arrangement. We have tentatively assigned this band to be the $3\nu_{2} + \nu_{3}$ combination band of $C_{2}H$. In addition, two $^{2}\Pi-^{2}\Pi$ transitions of $C_{2}H$ connecting known states were also recorded. The common lower level of the two bands is the $\tilde{X}(0 1 0)$ state, with the upper levels being the same as those of the known 3693 and $3600 cm^{-1}$ bands, respectively. Description: Author Institution: Herzberg Institute of Astrophysics, National Research Council URI: http://hdl.handle.net/1811/12344 Other Identifiers: 1991-FB-3