The vibronic band at 13352 cm - 1 of NO 2 is measured up to the hyperfine structure by bolometric detection. The excited vibronic state involved is a hybrid state having a major contribution from the electronic ground state. This follows from the hyperfine splitting of the K - = 0 and K - = 1 stacks as well as from the value of the rotational constantA . The anomalous intensity distribution induced by rovibrational interactions is not observed in the vibronic band analysed here. Although we suggest the absence of rovibronic interactions of significant strength, we underline the presence of vibronic interactions in the vibronic band analysed here.