Dispersed Fluorescence from the 460-nm Band System of NiCl2: Observation of a New, Low-Lying Electronic State.
The dispersed fluorescence spectrum of lines in the 460 nm band system of NiCl2 (nickel dichloride) is presented. The fluorescence was pumped on single rotational transitions of two spin components in a vibrational band observed previously in the laser excitation spectrum. Fluorescent transitions to levels of the &Xtilde;3Sigma-g (ground) state are assigned and discussed. The spectra also show clear evidence for a previously unidentified low-lying electronic state, assumed to be the Ã state, which lies about 2000 cm-1 above the ground state. This is likely to be of 3Pig character and is discussed on that basis. The wavenumber of the symmetric stretching vibration of NiCl2 in the Ã state is determined to be 367 cm-1, slightly larger than the &Xtilde; state value (360 cm-1). Copyright 1998 Academic Press.
Ashworth
SH
School of Chemistry, Bristol University, Cantock's Close, Bristol, BS8 1TS, Englandand
Brown
JM