Nuclear hyperfine splittings in the B-X electronic band system of 127I2

The spacings between seven hyperfine components in the R(127) line of the 11-6 band of the B-X electronic transition of 127I2 are fitted, with a standard deviation of 17.3 kHz, by varying the nuclear quadrupole coupling constants eqQ' and eqQ'', the magnetic spin-rotation constant C'sub(I) and the tensor and scalar nuclear spin-spin coupling constants d' and a' in the hyperfine hamiltonian. The P(13) line of the 43-0 band is also analysed using an identical hamiltonian and a standard deviation of 6.25 kHz is obtained. No evidence for a magnetic octupole coupling is found to the precision of the data although this effect was invoked by Hackel et al. for the P(13) line. (Auth.)