Abstract
The complete quadratic force fields and geometry have been calculated from PCILO wavefunctions for the HCOOCH 3 molecule. One empirical factor had to be applied to obtain good agreement. The complete set of force constants as well as the vibrational frequencies of HCOOCH 3, DCOOCH 3, HCOOCD 3 and DCOOCD 3 are well reproduced. The force field obtained seems reliable enough to allow a critical judgement of the experimental results to be made.
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