NO2 SPIN SPLITTINGS AND LANDE FACTORS AROUND 17000 CM(-1) - DEVIATIONFROM THE CURL RELATIONSHIP

We have measured the effective spin rotation constant and the Lande fa ctors of the N = 1, K = 0 rotational levels of 34 B-2(2) vibronic leve ls of NO2 located in the 16578-17842 cm(-1) energy range in a sufficie ntly high magnetic field to uncouple electron spin from rotation. The spin rotation constants are randomly distributed around zero and the L ande factors range from 2.00 (the free spin value) down to 1.80 in an apparently random fashion. In the ground state these two quantities sa tisfy the Curl relation. In contrast, our experiments show that this r elation is not satisfied around 17000 cm(-1). We discuss the origin of the breakdown of the Curl relation.