Observation of the A1A" state of isocyanogen.
The A1A" state of isocyanogen, CNCN, is observed using photofragment fluorescence excitation spectroscopy in a room temperature cell and in a molecular beam. The spectra are highly congested, but progressions that correspond to the Franck-Condon active C-N-C bending vibration in the excited state are evident. Linewidth measurements indicate that the excited state lifetime is <10 ps. These measurements are consistent with previous ab initio calculations, which predicted a bent excited state with a short lifetime due to predissociation. Although we do not believe that we have observed the origin band of the electronic transition, we place an upper limit of 42,523 cm(-1) on the energy of the excited state zero point level.
Lynch
W Bryan
WB
Department of Chemistry, University of Evansville, Evansville, Indiana 47722, USA.
Bechtel
Hans A
HA
Steeves
Adam H
AH
Curley
John J
JJ
Field
Robert W
RW