Double transitions in the Raman spectrum of the fundamental band of solid parahydrogen

In this paper we report the observation of double Raman transitions of the type $Q_1$(0)+$S_0$(0) in the fundamental band of solid parahydrogen. Although this band is a forbidden one, its intensity is of the order of 20% of the corresponding allowed $S_1$(0) band. The reason for this unusual behavior is discussed in some detail and is attributed to the strong mixing of the final states in the two manifolds involved.