Abstract
Relativistic complete active space MCSCF (CASSCF) followed by second-order configuration interaction calculations are carried out on several valence and Rydberg electronic states of GaH. The spectroscopic properties, dipole moments, and the potential energy curves of various electronic states are reported. The spectroscopic properties of 17 new electronic states are reported which are yet to be observed. The dissociation energy of the ground state is calculated to be 2.81 eV in excellent agreement with a corrected spectroscopic value of 2.80 eV obtained from the predissociation of the A- X system.
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