Schwingungsspektren der Schwefelringe S8, 34S8, S12 und S12 · CS2 sowie thermodynamische Funktionen der Moleküle Sn (n = 2 — 12) / Vibrational Spectra of the Sulfur Rings S8, 34S8, S12 and S12 · CS2 and Thermodynamic Functions of the Molecules Sn (n = 2…12)

Steudel, Ralf; Mäusle, Hans‐Joachim

doi:10.1515/zna-1978-0814

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Cited by 55 publications

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Vibrational study and molecular structure of two S4 isomers in sulphur vapour

Boumedien

Corset

Picquenard

1999

J. Raman Spectrosc.

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Raman spectra of sulphur vapour for two pressures (0.1 and 0.2 MPa) and various temperatures up to 700 • C were recorded using several krypton ion and argon ion laser exciting radiation wavelengths. Resonance Raman enhancement effects in conjunction with 32 S/ 34 S isotopic effects allow one to distinguish three fundamental vibrational modes (n s , n c , d s ) of a green absorbing ( max = 530 nm) chain-like S 4 molecule from the modes belonging to S 3 and other cyclic S 6 , S 7 and S 8 molecules. Moreover, using a 647.1 nm excitation wavelength, several vibrational modes of another red absorbing ( max = 560-660 nm) branchedring S 4 isomer were characterized. Finally, normal coordinate treatments confirm the trans planar C 2h structure of the chain-like S 4 species, whereas a comparison of the observed and calculated wavenumbers for the red absorbing S 4 isomer is in agreement with a branched-ring structure. EXPERIMENTALTwo sulphur samples were used in this study: a natural sulphur sample (Fluka puriss) and a labelled sulphur-34 sample (95% 34 S; CEA, France). Each sample contained

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