THEORY ON A PURE ROTATIONAL RAMAN SPECTRUM IN THE VIBRONIC GROUND STATE OF A TETRAHEDRAL MOLECULE
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Publisher:Ohio State University
A rigid tetrahedral molecule is known to have an isotropic polari-zability tensor and hence it does not exhibit a. pure rotational Raman spectrum in the vibronic ground state. An isotropic polarizability tensor operator, arising from centrifugal distortion forces and resulting in pure rotational Raman transitions, has been derived in terms of the components of the total angular momentum. Selection rules and expressions for the scattering intensities have been obtained using unsymmetrized symmetric top wave functions. The intensity of the pure rotational Raman spectrum relative to the vibrational Raman spectrum will be discussed in detail for the case of methane.
Author Institution: Ames Laboratory, Iowa State University
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