title: The d (3)Pi(g)-c (3)Sigma(u) (+) band system of C2.
abstract: A two-dimensional fluorescence (excitation/emission) spectrum of C2 produced in an acetylene discharge was used to identify and separate emission bands from the d (3)Pi(g)<--c (3)Sigma(u) (+) and d (3)Pi(g)<--a (3)Pi(u) excitations. Rotationally resolved excitation spectra of the (4<--1), (5<--1), (5<--2), and (7<--3) bands in the d (3)Pi(g)<--c (3)Sigma(u) (+) system of C2 were observed by laser-induced fluorescence spectroscopy. The molecular constants of each vibrational level, determined from rotational analysis, were used to calculate the spectroscopic constants of the c (3)Sigma(u) (+) state. The principal molecular constants for the c (3)Sigma(u) (+) state are B(e)=1.9319(19) cm(-1), alpha(e)=0.018 55(69) cm(-1), omega(e)=2061.9 cm(-1), omega(e)x(e)=14.84 cm(-1), and T(0)(c-a)=8662.925(3) cm(-1). We report also the first experimental observations of dispersed fluorescence from the d (3)Pi(g) state to the c (3)Sigma(u) (+) state, namely, d (3)Pi(g)(v=3)-->c (3)Sigma(u) (+)(v=0,1).
authors: School of Chemistry, University of Sydney, New South Wales 2006, Australia.
authors: Jenna A
authors: JA
authors: Joester
authors: Masakazu
authors: M
authors: Nakajima
authors: Neil J
authors: NJ
authors: Reilly
authors: Damien L
authors: DL
authors: Kokkin
authors: Klaas
authors: K
authors: Nauta
authors: Scott H
authors: SH
authors: Kable
authors: Timothy W
authors: TW
authors: Schmidt