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- W1660998565 abstract "A study of the Stark effect of nonrigid molecules is presented. First the group theoretical aspects of the hamiltonian of the rotation large amplitude internal motion problem is discussed, based on the concept of isometric groups of semirigid models (SRMs). General group theoretical aspects of the splitting of electric dipole transitions and general expressions for the Wigner-Eckart theorem of SRMs in electric fields are derived. The general theory is applied to a rather wide family of SRMs with one and two symmetric tops yielding a complete survey of the behavior of such systems in Stark fields. It further is used to formulate a method for the experimental determination of the orientation of the electric dipole moment from quadratic Stark effect measurements in molecules of this family. The method is exemplified by the analysis of the Stark effect of some transitions of the acetaldehyde molecule. The analysis is based on a solution of the rotation—internal rotation problem by infinite matrix diagonalization for one and two top molecules with local frame symmetry CS, for which computer programs have been developed. The possibility of detection of electric dipole transitions of molecules with vanishing constant part of the electric dipole moment is considered, basing on modulation effects by internal rotation." @default.
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- W1660998565 date "1978-02-01" @default.
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- W1660998565 title "Stark effect and isometric groups of nonrigid molecules." @default.
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- W1660998565 doi "https://doi.org/10.1016/0301-0104(78)87147-x" @default.
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