Ab Initio Calculation of Force Constants of Hydroxylamine

Abstract
Ab initio molecular orbital calculation has been applied to hydroxylamine molecule to reach a reliable set of force constants by the use of the 4-31G basis set. This approach was found to be an enlightening way to solve a problem of the so far undeterminable amino twisting frequency. For this, the value of 1250±100 cm−1 was estimated. A few comments are also given on the theoretical and experimental values of force constants.