以Nd:YAG激光器抽运光学参变振荡器/光学参变放大器做为激发源,得到了NO分子在220～350 nm波长范围内的双光子激光诱导荧光光谱,并将其归属于A2Σ(ν′=0)→X2Π(ν″=1～8)跃迁,用最小二乘法拟合获得NO分子X2Π态振动常量Yωe=(1904.7±7.3) cm-1,ω″ex″e=(14.2±1.2) cm-1,ω″ey″e=-(0.0218±0.0091) cm-1,及平衡位置的力常量k=(1.599±0.012)×103 N·m-1。计算了所得跃迁谱带的弗兰克康登因子及相对荧光强度,结果与实验观测值相符。这可为用激光诱导荧光光谱技术探测大气污染物NO分子提供理论及实验参考。

Two photon laser induced fluorescence spectrum (TP LIF) of NO in the wavelength range 220～350 nm is obtained by using optical parameter generator and amplifier pumped by Nd∶YAG laser as excitation source. A few stronger band can be attributed to A 2Σ(v′=0)→X 2Π(v″=1～8) transition. Some molecule constants about NO in the ground state are deduced by the spectrum. The Frank Condon factor and relative spectrum intensity are calculated. Compared with the results of experiment they are in accordance basically and a little difference is discussed. All of these can provide an important reference for monitoring of NO by the technique of laser induced fluorescence.