The Relationship Between Symmetry of Molecules and Observed Absorption Bands

THE RELATIONSHIP BETWEEN SYMMETRY OF MOLECULES AND OBSERVED ABSORPTION BANDS 4.4A. Introduction 

To relate the observed infrared bands to the vibratory motions of the atoms in a molecule it is necessary to assume a structural model for the molecule. Vibrations can then be discussed as fundamentals, overtones, or combination bands in terms of this model. Since the description of vibrations is in terms of a molecular model, it will be possible to predict whether a vibration will be infrared 

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