利用脉冲高压直流放电技术产生H超声分子束,以纳秒染料激光二倍频输出(282 nm)作为激发光源,通过LIF光谱测量方法,获得了OH A ^2Σ+-X ^2Π(1, 0)带转动分辨激发荧光谱,并通过对谱线强度分布的分析和计算,得到X 2Π态H的转动温度为(30±1) K;通过对A ^2Σ+-X 2Π (1, 1)带及(0, 0)带跃迁的荧光衰减时间谱测量,拟合得出H激发态 A ^2Σ+ (v′=1)及X^ 2Π (v″=0)的寿命分别为(637±6)和(675±13) ns。
Hydroxyl radical molecular beam was generated by DC pulsed high voltage discharge. The rotational resolution excitation fluorescence spectra of the OH A ^2Y,+-X^ 2H (1, 0) band were observed by using second harmonious output of a nanosecond dye laser (around 282 nm). The rotational temperature of the (1, 0) band was determined to be (304-1) K based on the analysis of the intensity distribution of the OH spectra. Moreover, the fluorescence decay curves of the (1, 1) band and the (0, 0) band and were obtained and the fluorescence lifetimes of A ^2∑+ (v'= 1) state and the X 2П (v"=0) state were fitted to be (637±16) and (675±13) ns, respectively.