Electronic States of the Noble-gas Halide Molecules

Krause, S. G. Johnson, S. Data, aiid F. K. Schmidt-Bleek, Chem. Phys. Letters, 1975, 

As shown in this figure, S and n states arise from interaction of ground state A 5 and X P, with the latter state expected to lie higher in energy. The spin-orbit splitting in the 11 state is expected to be determined largely by that of the halogen atom. 

The origin of the weaker secondary continua at longer wavelengths is still in doubt, although they certainly involve the repulsive n state as the low level of the transition. - Emitting levels afe probably not restricted to the C(i) state, but the relative role of the IHi) and hi ier-lying states awaits further study. 

The potential curve diagrams for ArBr, Arl, KrI, and, to a lessw extent, ArO, KrBr, and Xel are complicated by the presence of low-lying molecular states, which correlate with excited halogen atoms. These states are poorly characterized at present but are responsible for the predissociation channd (S6), which has been observed for ArCl, ArBr, and Arl by the appearance of strong onission from excited halogen atoms.  

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