The a-X transitions of GaCl and GaI have recently been observed under and led to the rotational constants in Table 1, with a standard deviation of 0.040 cm 01 as expected from the accuracy of the measurements which was high resolution with enriched gallium isotopes, 69 Ga isotopic purity ú99% for GaCl (1) and 71 Ga isotopic purity ú99% for GaI (2, 3). This yielded, reported to be on the order of 0.050 cm 01 . The B, D, A, and A D constants were determined with good precision. The H constants were found to be in both cases, clean spectra without any contamination by the other isotope and therefore an easier analysis.
meaningless.
In 71 Ga 127 I, for the 0-0 band, the R 1 , P 1 , R 2 , and Q 2 branches (3) were The two spin components, P 0 and P 1 , of the 3 P were treated as independent electronic states, giving no information on the spin-orbit coupling, used in the same way as for GaCl, but gave an unsatisfactory fitting with a standard deviation of 0.13 and residues (observed 0 calculated) deviating though it was mentioned in both cases (1, 2) that the upper 3 P state belongs to Hund's case a.
up to 0.8 cm 01 for some J values. When looking carefully, it was clear that only parts of the branches were correctly numbered: R 1 from J Å 47 For that reason, we submitted the rotational lines published by Venkatasubramanian et al. (1) for 69 GaCl and by Sunanda et al. (2) for 71 GaI to to