Ar气对^(39)K_2分子C^1Ⅱ_u→X^1∑_g^+LIF光谱的碰撞猝灭效应

Quenching effect of LIF spectrum for dimer ^(39)K^2(C^1∏_u→X^1∑_g^+) by collision of buffer gas Ar

实验测量了缓冲气体Ar气对^(39)K_2分子C^1Π_u(v′=O,J′=53)→X^1∑_g^+(v″=5,6,J″=52,54)LIF光谱的碰撞猝灭效应.用稳态碰撞模型推导出LIF光谱强度I对气体压强P=P_(Ar)+P_K的函数关系.用上述模型拟合出的I-P曲线和实验数据的符合,对拟合所得参数C_1的进一步分析指出:热管炉后向探测LIF光谱方法比非增益荧光探测法的灵敏度可提高2倍以上.

The quenching effect of LiF spectrum of C1∏u(v'=0, J =53)→X1∑g+(v' = 5, 6: J' =52, 54) for dimer 39K2 by collision of buffer gas Ar was measured experimentally. The relation between the intensities I of LIF spectrum and the pressure P = PAr+PK in beat-pipe oven was deduced by stable collision model. IThe -P plot fitted by this model was in satisfactory agreement with the experimental data. Further analysis of the parameter C1 fitted showed that: the sensitivity of backward detection for heat-pipe oven was 2 times more than that of non-gain fluorescence detection.