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Radio Physics and Radio Astronomy

ISSN Druckformat: 2152-274X
ISSN Online: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i2.80
pages 159-167

MICROWAVE SPECTROSCOPY OF TORSION VIBRATIONS IN MOLECULES: APPROXIMATION OF STRICT COUPLING BETWEEN THE STRUCTURAL TORSIONAL PARAMETERS ρ AND F IN THE RHO AXIS METHOD

V. V. Ilyushin
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Chervonopraporna St., Kharkiv, 61002, Ukraine

ABSTRAKT

In the paper, the approximation of strict coupling between the structural torsional parameters F and ρ in the Rho axis method and its applicability to analyzing the observed molecular spectra are considered for the molecules with methyl top hindered internal rotation. The functional relation between the F and ρ parameters which is implied in the rigid molecular structure approximation makes it possible to replace variation of these two parameters by variation of a single structural parameter, namely, of the moment of inertia of the C group which is in torsion motion. The approximation in question has been verified through processing spectrum measurement data for a number of molecules which spectra have been analyzed in the literature using standard Rho axis method. It is shown that structural distortions in molecules with hindered internal rotation of the C group, which are associated in the standard model of the Rho axis method with separate variation of the F and ρ parameters, are insignificant for the ground torsional state and can be accounted for through considering the fourth-order terms of the Hamiltonian in the course of fitting the spectra of excited torsional states.


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