DOUBLE-WELL OF THE C(2)SIGMA(+) STATE OF LIAR

The X-2 Sigma(+), A(2) Pi, B-2 Sigma(+) C-2 Sigma(+) states of LiAr an d the ground state of LiAr+ are calculated by configuration interactio n methods. The existence of a double potential well is found for the C -2 Sigma(+) state. The origin of the double well is surmised to lie in the existence of a nodal plane separating two radial regions of the e lectron density in the Rydberg atomic orbital. The spectroscopic const ants and the transition properties between the calculated states are a lso reported. (C) 1997 Elsevier Science B.V.