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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 3, p.222-225

    Paper

Kuyliev B.T.1, Orlova N.D.2, Pozdnyakova L.A.2, Meyliev L.O.1, Rahmonova M.A.1, Huzhamberdieva Zh.N.1

1 Karshi State University
(Karshi, Uzbekistan; e-mail: bahromq@rambler.ru)
2 St.-Petersburg State University
(Russia)

Vibrational-Rotational Interaction in Molecules of the Spherical Top Type

Section: Atoms and molecules
Original Author's Text: English

Abstract: We show that, in the Raman spectrum of very low-density gases, the Q branch of the nu1 band of methane and deuteromethane has asymmetric contour. With increase in the gas density, the band contour becomes more symmetric and broadens. The band shape is described by the Voigt curve. Possible mechanisms of the vibrational broadening of ν1 – dephasing and intermode exchange of vibrational energy – are analyzed. Both mechanisms may be efficient in the band broadening.

Key words: Raman spectra, spherical top, vibrational-translational interaction.