Dispersed Fluorescence from the 460-nm Band System of NiCl2: Observation of a New, Low-Lying Electronic State
✍ Scribed by Stephen H Ashworth; John M Brown
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 206 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
The dispersed fluorescence spectrum of lines in the 460 nm band system of NiCl 2 (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 X ˜3⌺ g Ϫ (ground) state are assigned and discussed. The spectra also show clear evidence for a previously unidentified low-lying electronic state, assumed to be the A ˜state, which lies about 2000 cm Ϫ1 above the ground state. This is likely to be of 3 ⌸ g character and is discussed on that basis. The wavenumber of the symmetric stretching vibration of NiCl 2 in the A ˜state is determined to be 367 cm Ϫ1 , slightly larger than the X ˜state value (360 cm Ϫ1 ).