“…As a consequence, spectroscopic effects and peculiarities should be particularly pronounced in the spectra of phosphine species. Both PH 3 and PD 3 and the partially deuterated PH 2 D species have been studied to some extent (see, e.g., (1,2,(6)(7)(8) and references cited therein). As to PHD 2 , this has been studied only in the microwave region (9)(10)(11)(12)(13), and recently in the far infrared regions (1).…”