Firstly, Stark effects have been observed for individual lines in the excitation spectrum of the NHD radical, recorded in the visible region with a tunable dye laser. Individual MT components have been resolved with Doppler limited resolution. The results are interpreted in terms of an interaction between the applied electric field and a ground state dipole moment determined to be 1.82±.05D'and a dipole moment in the (0,9,0) level of the A'A' state determined to be 0.19±.06D. Secondly, a simple perturbation treatment is used to reduce the number of independent transition moments (which may, in principle, be many) necessary to describe the intensity distribution of intercombination transitions (involving AS=l) in diatomic molecules. It is demonstrated that, in general, the number of independent transition moments can always be reduced to three (four for if - II transitions). The treatment is valid for weak spin-orbit interaction between electronic states, and yields formulae, by which any intercombination transition moment can be expressed in terms of one of three parameters - u//, ull,or h12. Several examples of the application of these formulae is given.