By laser excited fluorescence of the hydrides obtained in a discharge, the ground state vibrational levels of NaH, NaD, KH, and KD have been observed up to v ″= 15, 20, 14, and 16, respectively, instead of v ″= 8, 2, 4, and 4 by conventional spectroscopy. Experimental values of G v ″, B v ″, and D v ″are obtained. Spectroscopic parameters and RKR potential curves are calculated. In NaH and NaD, a comparison can be made with abinitio ...
