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实验获得了Ａｒ＋激光５１４．５ｎｍ线诱导２３Ｎａ３９Ｋ分子产生的Ｄ１∏→Ｘ１∑＋跃迁荧光谱．通过测量激光感生荧光光谱强度随泵浦功率、热管炉温度及缓冲气压变化规律，详细研究了其跃迁机制．用最小二乘法拟合获得２３Ｎａ３９Ｋ分于Ｘ１∑＋态振动常数．理论计算了各跃迁谱支波长值及Ｆｒａｎｃｋ－Ｃｏｎｄｏｎ因子和光谱强度值，与实验观测值符合得相当好，充分表明本文对激光感生荧光光谱的归属以及对各支谱线振、转量子数的赋值是合理的．
Fluorescence spectrum of D1Π → X1Σ + transition induced by 23.5a39K molecule induced by Ar + laser at 514.5nm was obtained experimentally. By measuring the intensity of laser-induced fluorescence spectrum with the pump power, the temperature of the heat pipe furnace and the pressure variation of buffer gas, the transition mechanism was studied in detail. The vibrational constants of X1Σ + state at 23Na39K were obtained by least square fitting. The calculated branch length and the Franck-Condon factor and the spectral intensity of each transition were calculated theoretically in good agreement with the experimental observations. It is fully demonstrated that the laser induced fluorescence spectra belong to each other and the vibrational and quantum numbers The assignment is reasonable.