The rotational analysis of the five new vibronic bands of NO2 in the range5050-5200 angstrom

The five new vibrational bands in the range 5050-5200 Angstrom of the laser induced fluorescence excitation spectra of NO2 were measured and rotationa lly assigned at room temperature. Though the spectra were rather congested, we can determine the band origins, and rotational and spin-rotation consta nts for these bands. All rotational structures analyzed are of the parallel type. It was shown that the electronic excited state (A) over tilde B-2(2) were heavily perturbed by the high lying vibration of ground state (X) ove r tilde (2)A(1) and that the interactions between these two electronic stat es was the main rationale for the complexity of NO2 visible spectra.