Vibrations des molécules formées de deux blocs rigides simplement liés

Schomaker & Trueblood's analysis of the rigid body motion of molecules in terms of three tensors is applicable to some molecules formed by two single bounded parts. If the librations of the two parts round the bond are considered as independent, it is shown that four additional parameters are needed. Then the total number of independent components is twenty-four. This analysis has been applied to eight molecules and a comparison of the two models has been made. For some molecules, the results of the two methods are noticeably different, the analysis permitting independent librations of the two cycles being more satisfactory.