Some comments are given on the construction of Polo's &rgr; vectors. Methods are reported for the construction of the (a)G—1C&agr;and (b)G—1C&agr;G—1matrices by means of the (a) &rgr; andsvectors, and (b) &rgr; vectors alone. These matrices are important in the study of Coriolis interaction coefficients of rotation—vibration. For illustration of the theory the ethylene‐type molecular model is taken as an example.
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