RT Journal Article
ID 6d1ac1e73424c362
A1 Ilyushin, V. V.
T1 MICROWAVE SPECTROSCOPY OF TORSION VIBRATIONS IN MOLECULES: APPROXIMATION OF STRICT COUPLING BETWEEN THE STRUCTURAL TORSIONAL PARAMETERS ρ AND *F* IN THE RHO AXIS METHOD
JF Radio Physics and Radio Astronomy
JO RPRA
YR 2012
FD 2012-05-15
VO 3
IS 2
SP 159
OP 167
K1 Rho axis method
K1 hindered internal rotation
K1 microwave spectroscopy
K1 torsion-rotation spectrum
AB 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*_{3υ} 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*_{3υ} 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.
PB Begell House
LK http://dl.begellhouse.com/journals/6fd1549c0e2c05da,6f536281699b948c,6d1ac1e73424c362.html