title: Gas-phase spectroscopy of the 2 3Sigma(-)-X 3Sigma- electronic transition of CCS.
abstract: Gas-phase laser excitation spectra of the jet-cooled CCS radical were observed for the 2 (3)Sigma(-)-X (3)Sigma(-) electronic transition in a discharge of a gas mixture containing acetylene and H(2)S in Ar. The observed excitation spectra show complicated rotational structures, consisting of a much larger number of rotational lines than those expected for this size of linear molecule. The excited vibronic levels emit fluorescence, the lifetime of which is much longer than that estimated theoretically, indicating that the upper levels are strongly mixed with many "dark" background levels. Dispersed fluorescence spectra from single vibrational levels of the 2 (3)Sigma(-) state show long progressions of the C-S stretching mode, enabling observations of many vibrational levels in the ground electronic state.
authors.affiliation: School of Chemistry, University of Sydney, New South Wales 2006, Australia.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Nakajima
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Schmidt
authors.forename: Akira
authors.initials: A
authors.lastname: Miyoshi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Sumiyoshi
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Endo