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The T1←S0 Absorption Spectrum of Gaseous 4H-Pyran-4-thione

✍ Scribed by A.A. Ruth; T. Fernholz; R.P. Brint; M.W.D. Mansfield

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
189 KB
Volume
214
Category
Article
ISSN
0022-2852

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✦ Synopsis

IN MEMORY OF DR. BERNHARD NICKEL

The T 1 ← S 0 absorption spectrum of 4H-pyran-4-thione (PT) was measured in a static cell at room temperature (550-620 nm) and in a seeded cold supersonic jet (580-600 nm) using the cavity ring-down (CRD) method. In the static cell absolute extinction coefficients were determined between 573 and 610 nm with an accuracy of ∼±5%. In this region 22 harmonic sequences and 18 hot bands were observed. The energetically lowest ground state vibration at 167.5 cm -1 was identified as the promoting mode in the static PT gas. The mode in the triplet state was found at 152.3 cm -1 . The CRD absorption spectra of static PT gas and jet-cooled PT are compared with the phosphorescence excitation spectrum of isolated PT. The weak S 1,0 ← S 0,0 absorption was tentatively assigned to a transition at ∼17433 cm -1 .

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