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H 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 H A 2Σ+-X 2Π (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 (30±1) K based on the analysis of the intensity distribution of the H 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 2Σ+ (ｖ′=1) state and the X 2Π (ｖ″=0) state were fitted to be (637±16) and (675±13) ns, respectively.