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用微扰增强双共振对钠分子4~3∑_g~+态33900～35200 cm~(-1)的65个振转能级进行了实验观测。以往用连续激光双共振方法只看到低振动能级,用脉冲激光双共振和检测解离产物的方法只观测到高振动能级。获得的新数据填补了以往数据的空缺。综合v=0～31能级所有数据,拟合出一套分子常数,计算出RKR势能曲线。主要分子常数为：T_e=32127.090 cm~(-1),ω_e=121.1099(0.20720)cm~(-1),B_e=0.116287(0.0002300)cm~(-1),Re=3.551 (?)。还对J. Chem. Phys.108,7707 (1998)中RKR势能曲线的一个错误进行了纠正。
Sixty-six vibrational energy levels of 4 ~ 3Σ_g ~ + state 33900 ~ 35200 cm ~ (-1) of sodium have been experimentally observed by using perturbation-enhanced double resonance. In the past, only the low vibration level was seen by the continuous laser double resonance method. Only the high vibrational level was observed by pulsed laser double resonance and the detection of dissociation products. The new data obtained filled the gap in the previous data. Based on all the data of v = 0 ~ 31 energy levels, a set of molecular constants are fitted and the potential energy curve of RKR is calculated. The major molecular constants are: T_e = 32127.090 cm -1, ω_e = 121.1099 (0.20720) cm -1, B_e = 0.116287 (0.0002300) cm -1, Re = 3.551 (?). An error of the RKR potential curve in J. Chem. Phys., 108, 7707 (1998) was also corrected.