Symmetry Properties of Rigid Molecules
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In this chapter we turn to the problem of the symmetry properties of quasirigid molecules. Apart from being a question of fundamental importance in molecular physics, this subject is of some topical interest, as the availability of tunable infrared lasers has made it possible to obtain the vibration-rotation spectra of highly symmetric molecules such as CH4, SF6, and CF4 at very high resolution (~ 10−3 cm−1) and a prerequisite for interpretation of the interesting features revealed by such measurements  is a clear and detailed understanding of the assignment of symmetry labels to molecular states and tensor operators.
KeywordsPoint Group Molecular Symmetry Rigid Molecule Nonrigid Molecule Identical Nucleus
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