# DIRECT OBSERVATION OF TORSIONAL LEVELS AND VIBRATION-TORSION-ROTATION INTERACTION IN RAMAN SPECTRA OF $C_{2}H_{6}$

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 Title: DIRECT OBSERVATION OF TORSIONAL LEVELS AND VIBRATION-TORSION-ROTATION INTERACTION IN RAMAN SPECTRA OF $C_{2}H_{6}$ Creators: Fantoni, R.; Van Helvoort, K.; Knippers, W.; Reuss, J.; Meerts, W. Leo Issue Date: 1986 Publisher: Ohio State University Abstract: The detection of spontaneous Raman scattering induced by an intense Ar ion laser in an intracavity cell containing $C_{2}H_{6}$ (either bulk or jet) has allowed the measurement of weak bands involving the excitation of the torsional mode $v_{4}$. Barrier indcued splittings have been measured up to the fifth torsional level. Current theories for vibrational-torsional-rotational interaction in the case of a high barrier have been applied to interpret the Raman spectra. The calculated $\nu_{4}$ energy levels used in the simulation give a qualitative picture of the spectra. Quantitative agreement has been found up to the third overtone by choosing $V_{3}=1009.1 cm^{-1}$ and $V_{6}=11.0 cm^{-1}$. Measurement of $2\nu_{9}+2\nu_{4},2\nu_{6}+2\nu_{4}$ and $2\nu_{2}+2\nu_{4}$ combination bands has given information on the effect of the molecular vibrations on the torsional barrier. New results on $CH_{3}CD_{3}$ will be presented as well. Description: $^{\ast}$ Fysisch Laboratorium, Katholieke Universiteit Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Neither lands $^{\ast\ast}$ Permanent address: Lab. Spettroscopia Moleculare ENEA, CRE Frascati, Italy Author Institution: URI: http://hdl.handle.net/1811/16995 Other Identifiers: 1986-RD-6