Abstract
The previously reported theory for treating mean-square amplitudes of vibration of polyatomic molecules is applied to the parallel vibrations of linear triatomic molecules. The mean-square amplitude quantities, as well as the harmonic force constants are related to the normal frequencies. Furthermore, approximate expressions are given for a set of mean-square amplitude quantities. It is pointed out that in the general case, three mean-square amplitudes of vibration might be detected from electron-diffraction, and represent sufficient informations for calculating all the vibrational constants of the parallel vibrations. A special treatment of the linear symmetrical XY2 molecular model is included.
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