Abstract
Eighteen bands of the Delta v=+4, +3 and -2 sequences of the B 2 Sigma +-X 2 Sigma + system of AlO have been photographed at high resolution and analysed for the rotational structure. It has been found that the spin-doubling constant gamma in the X 2 Sigma + state increases very rapidly with the vibrational quantum number v, while in the B state it remains almost constant and does not change with v. Also, the spin doubling in the v"=4, 5, 6 and 7 levels of the X 2 Sigma + state is not simply a linear function of N as found by earlier workers. It is found necessary to include a cubic term in N in the formula for the observed spin doubling in the X 2 Sigma + state. The unusual increase in the spin doubling is attributed to the proximity and the interactions of the vibrational levels of the A 2 Pi i state with the vibrational levels of the X 2 Sigma + state.
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