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Jakie własności cząsteczek dwuatomowych można wyznaczyć z widm wibracyjno-rotacyjnych?

Molski M.

Wiadomości Chemiczne

1998

[Z] 52, 9-10

713--726

Highly resolved vibration-rotational spectra of diatomic molecules are a source of important information about their internal structure and physical properties including mechanical, extra-mechanical and electromagnetic properties. The mechanical effects are considered in terms of Born-Oppenheimer internuclear potential whereas extra mechanical properties constitute adiabatic and nonadiabatic effects. Electromagnetic properties of a molecule include dipole moment, electric polarity and rotational g-factor connected with molecular magnetisability. In this review we discuss a possibility to determine from the spectra not only the aforementioned properties but also a molecular susceptibility to rotational deformation caused by the centrifugal force. The theoretical considerations are illustrated by the analysis of highly resolved spectrum of the seven isotopomers of GeS including 74Ge32S, 70Ge32S, 76Ge32S, 73Ge32S, 72Ge32S, 74Ge33S and 74Ge34S, allowing us to determine the dipole moment, electric polarity and the rotational g-factor of this molecule.