title: D2Pi(u), C2Pi(u) <-- X2Pi(g) electronic transitions of NCCN+.
abstract: The electronic absorption spectrum of NCCN(+) in the gas phase was measured at approximately 15 K in a 22-pole ion trap. The spectra show two band systems assigned to the C(2)Pi(u)-X(2)Pi(g) and D(2)Pi(u)-X(2)Pi(g) transitions with origin band maxima at 17,363 (3) and 33,409 (5) cm(-1), respectively. Both absorptions show distinct vibrational structure with progressions in nu(2) as well as combinations of double quanta excitations in nu(4) and nu(5). Rotational structure of the 0(0)(0) bands could not be resolved, which indicates that the C(2)Pi(u) and D(2)Pi(u) states have a lifetime on the order of a hundred femtoseconds because of fast intramolecular processes.
authors.affiliation: Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.
authors.forename: C A
authors.initials: CA
authors.lastname: Rice
authors.forename: V
authors.initials: V
authors.lastname: Rudnev
authors.forename: S
authors.initials: S
authors.lastname: Chakrabarty
authors.forename: J P
authors.initials: JP
authors.lastname: Maier