title: Observation of the d3Pi(g)<--c3Sigma(u)+ band system of C2.
abstract: A new band system of C(2), d (3)Pi(g)<--c (3)Sigma(u) (+) is observed by laser induced fluorescence spectroscopy, constituting the first direct detection of the c (3)Sigma(u) (+) state of C(2). Observations were made by laser excitation of c (3)Sigma(u) (+)(v(")=0) C(2), produced in an acetylene discharge, to the d (3)Pi(g)(v(')=3) level, followed by detection of Swan band fluorescence. Rotational analysis of this band yielded rotational constants for the c (3)Sigma(u) (+)(v(")=0) state: B(0)=1.9218(2) cm(-1), lambda(0)=-0.335(4) cm(-1) and gamma(0)=0.011(2) cm(-1). The vibrational band origin was determined to be nu(3-0)=15861.28 cm(-1).
authors.affiliation: School of Chemistry, University of Sydney, NSW 2006, Australia.
authors.forename: Damian L
authors.initials: DL
authors.lastname: Kokkin
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Reilly
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Morris
authors.forename: Masakazu
authors.initials: M
authors.lastname: Nakajima
authors.forename: Klaas
authors.initials: K
authors.lastname: Nauta
authors.forename: Scott H
authors.initials: SH
authors.lastname: Kable
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Schmidt