title: Quantum chemical study and experimental observation of a new band system of C(2), e 3Pi(g)-c 3Sigma(u)+.
abstract: A new band system of C(2), e (3)Pi(g)-c (3)Sigma(u)(+) was studied by ab initio quantum chemical and experimental methods. The calculations were carried out at the multireference configuration interaction level of theory with Davidson's correction using aug-cc-pV6Z basis set and include core and core-valence correlation as well as relativistic corrections computed with aug-cc-pCVQZ and cc-pVQZ bases, respectively. The vibrational energies and rotational constants of the upper e (3)Pi(g) state were calculated from the computed ab initio potential energy curve. The ab initio results indicate that the electronic transition moment of the e (3)Pi(g)-c (3)Sigma(u)(+) system is approximately one-half that of the Fox-Herzberg e (3)Pi(g)-a (3)Pi(u) system. Franck-Condon factors were calculated for both systems and used to guide experiments aimed at discovering the e (3)Pi(g)-c (3)Sigma(u)(+) system. The e (3)Pi(g)(v(') = 4)-c (3)Sigma(u)(+)(v(") = 3) band of jet-cooled C(2) was successfully observed by laser-induced fluorescence spectroscopy by monitoring the ensuing e (3)Pi(g)-a (3)Pi(u) emission.
authors: School of Chemistry, The University of Sydney, New South Wales 2006, Australia.
authors: Masakazu
authors: M
authors: Nakajima
authors: Jenna A
authors: JA
authors: Joester
authors: Nathan I
authors: NI
authors: Page
authors: Neil J
authors: NJ
authors: Reilly
authors: George B
authors: GB
authors: Bacskay
authors: Timothy W
authors: TW
authors: Schmidt
authors: Scott H
authors: SH
authors: Kable