Calculation of the normal modes of CH3OP(s)Cl2 and (CH3O)2P(S)Cl

Frequency and form are deduced for the normal modes. The calculated and observed deformation frequencies of the CH₃O group agree only if the force field of that group has C_S symmetry. The C-O, P-O, P=S, and P-Cl modes are examined for characteristic behavior. The integral intensities of the corresponding bands are reported for trichlorothiophosphate, methyldichlorothiophosphate, dimethylchlorothiophosphate, and trimethylthiophospate.The behavior of the integral intensity of the P=S band is discussed.