Laser-induced fluorescence excitation spectrum of NO2 in the region of 500-532 nm at room temperature

The high-resolution fluorescence excitation spectrum was measured in the re gion of 500-532 nm at room temperature. Though the spectrum was rather cong ested,we could determine the molecular constants such as band origins and r otational and spin-rotation constants for 25 vibronic bands in the two most intense absorption regions 505-510 nm and 513-520 nm. Among the vibronic b ands assigned there were 5 new bands observed and reported in this work. Al l rotational structures analyzed were of the parallel type. It was shown fr om the experiment that the high lying vibration levels of ground state (X) over tilde (2)A(1) had heavily perturbed the electronic excited state (A) o ver tilde B-2(2).