Abstract: Two photons fluorescence excitation spectrum in the range of 420～472 nm of NO is obtained.The spectrum is attributed to A2∑(v′=0.1)←X2∏(v″=0)Transition.The value for force constant of k=2.32×103 N/m is gotten.The fluorescence decay spectrum of A2∑(v′=0)→X2∏(v″=0,1…)at different pressure are measured.The value for the spontaneous radiative lifetime of A2∑(v=0) is 195 ns.

Key words: NO, Fluorescence excitation spectrum, Fluorescence decay spectrum