超声射流冷却自由基NH_2的激光诱导荧光激发谱

LIF Excitation Spectrum of NH_2 Cooled in the Supersonic Jet

用准分子激光器泵浦的染料激光器做光源,通过NH_3/Ar放电产生NH_2自由基,得到超声射流冷却的NH_2在530-570nm范围的激光诱导荧光(LIF)激发谱。转动温度约为20K。其中∏(0,10,0),∏(1,6,0)带与S.Mayama等所得的结果一致,另外还得到了∑(0,11,0)带。

The fluorescence excitation spectrum of NH_2 in the supersonic jet has been measured in the wavelength range of 530-570nm using dye laser pumped by an excimer.The NH_2 radical was produced in discharge of NH_3/Ar.Comparing with the spectrum given by S.Mayama et al.the (0,10,0)subband is in good agreement,and the rotational temperature is estimated to be about 20K.The (1,6,0)subband was obtained also.However,the∑(0,11,0)subband was found showing the vibrational temperature was not cooled sufficiently.