Abstract
(1) The rotational analysis of the γ system bands has been done, the third order emission spectra due to 21-foot concave grating being _??_sed.
(2) These bands can be attributed to the transition of 3∑→3Π, of which the final state coincides with that of the α system.
(3) The trebling of the level with each value of K in the 3∑ rate cannot be found, and the levels for small values of K of the ranches of v'=0 undergo peculiar perturbations.
(4) The 3_??_Π state gives an example approximating to Case a.
(5) The following values of the rotational constants have been obtained: -
B'e=0.5658cm-1, α'=0.0077, r'e=1.477×10-8cm, B''e=0.6189cm-1, α''=0.0038, r''e=1.412×10-8cm. _??_he constants of the final state are quite near those obtained by Lowater for α system.
(6) The Λ-type separations in the 3Π state have been determined.
(7) The isotope effect is discussed
