Spectroscopy of HfS: Rotational Analysis of theb3Π → a3Δ Band System in the 1.7 μm Region

✍ Scribed by O. Launila; J. Jonsson; G. Edvinsson; A.G. Taklif

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 323 KB
• Volume: 177
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0136

✦ Synopsis

Emission bands of the HfS radical in the region 4700-6900 cm 01 have been recorded with a resolution of 0.008 cm 01 using Fourier transform techniques. The rotational structure of the bands of the 180 H 32 S isotopomer has been analyzed and molecular parameters have been derived for the electronic states involved. The dominating part of the bands is shown to belong to the b 3 P r a 3 D transition, where the b 3 P 0 / and b 3 P 1 substates are identical to the previously assigned A 1 S and B 1 P states. The linkage between the triplet and singlet manifolds of HfS is established directly through the observation of the nominally forbidden a 3 D 1 r X 1 S / transition near 6620 cm 01 , as well as through additional transitions linking two common upper states (b 3 P 0 / and b 3 P 1 ) with X 1 S / , a 3 D 1 , and a 3 D 2 . Two further transitions connect the a 3 D 2 and a 3 D 3 substates with an additional upper state, assigned as C 1 D. Perturbations in the b 3 P 2 state are observed and discussed. The term scheme of HfS is interpreted in terms of spin-orbit interaction, and electronic configurations of the electronic states of HfS are discussed.