COMPUTED DISTRIBUTIONS OF ROTOVIBRATIONAL TRANSITIONS IN LIH(X(1)SIGMA(+)) AND LIH+(X(2)SIGMA(+))

Accurate potential energy curves for the ground electronic states of L iH and LiH+ are employed to generate vibrational and rotational levels over a broad range of J values for both systems. The corresponding di pole functions are computed and used to obtain the frequency and inten sity distributions of all relevant transitions between bound states fo r pure vibrational excitations, pure rotational excitations and for di pole allowed rovibrational processes. This extensive set of absorption data for both molecules is employed to locate the most likely region in the infrared spectrum where characteristic lines could be observed. Such data should be useful in experimental attempts to search for LiH and LiH+ lines at high redshifts. We found that transitions between i onic levels will be markedly less intense than those for the neutral s ystem and that transitions between rotationally 'hot' levels will be m arkedly more intense than those between low-J levels.