# A HIGH RESOLUTION STUDY OF THE VACUUM ULTRAVIOLET ABSORPTION SPECTRUM OF CS

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 Title: A HIGH RESOLUTION STUDY OF THE VACUUM ULTRAVIOLET ABSORPTION SPECTRUM OF CS Creators: Stark, G.; Yoshino, K.; Smith, P. L. Issue Date: 1987 Publisher: Ohio State University Abstract: A high-resolution, vacuum ultraviolet absorption study of CS was performed. The CS molecule was produced in a side arm attached to a 25-cm absorption cell, in a silent, a. c. discharge through argon and $CS_{1}$. A condensed, a. c. discharge in 400 Torr of krypton was used to produce a background continuum extending from 1250 \AA to 1600 \AA. Spectra were photographed on a 6.65-m vacuum spectrograph in the first order of a 2400 grooves/mm grating. Four bands (0-0, 1-0, 2-0, 1-1) of the $^{12}C^{32}S B^{1}\Sigma^{+} - X^{2}\Sigma^{+}$ system were observed, plus the 1-0 band heads of $^{13}C^{32}S$ and $^{12}C^{34}S$. A rotational analysis of the $^{12}C^{32}S$ 1-0 band, the only band with resolved rotational structure, was completed. The other bands in the B-X system were observed to be diffuse, presumably because of predissociation of the $B_{2}\Sigma^{+}$ state. The derived equillibrium molecular constants of the $B_{1}^{\prime}$ state were found to be close in value to those of the $2\Sigma^{+}$ ground state of the $CS\Sigma^{+}$ ion, indicating that the $B_{2}^{\prime}$ state is a Rydberg state of CS. All absorption features shortward of the B-X system were found to be diffuse. Descriptions and wavenumbers of these features, which are tentatively identified as CS transitions, are presented. This work is supported by NASA grant NSG-7304. Description: Author Institution: Harvard-Smithsonian Center for Astrophysics, 60 Garden St. URI: http://hdl.handle.net/1811/17364 Other Identifiers: 1987-TG-13