~(39)K_2分子C~1Ⅱ_u-X~1∑_9~+(J′=105)Q支激光诱导荧光光谱及电偶极跃迁矩变化率研究

用4415.6(?)CW激光线获得了~(39)K_2分子C~1II_u(v′=0,J′=105)-X~1∑_g~+(v″=1～10,J″=105)Q支激光诱导荧光(LIF)光谱.用最小二乘法拟合出了~(39)K_2分子X~1∑_g~+态振动常数和C~1II_u态电子谱项值T_e.光谱分析表明C~1II_u态T_e=22968cm~(-1)是合适的.用~(39)K_2分子Morse势计算了(V′=0,J′=105)-(v″=1～10,J″=105)跃迁的Franck-Condon因子和跃迁强度,强度计算值和激光诱导荧光光谱测量值之间有令人满意的符合,进一步的r重心近似分析给出了~(39)K_2分子C~1II_u→X~1∑_g~+电偶极跃迁矩R_(?)随核间距r的归一化变化率为-0.157～-0.168 debye/(?)(4.22(?)

LIF spectrum of Q-branch (J′=105) and changing ratio of electronic dipole transition moment of C1Ⅱu-X1∑9+ for dimer 39K2

The laser-inducea fluorescence (LIF) spectrum of Q-branch of C1∏u(v =0, J = 105)- X1∑g+(v"=1-10, J" = 105) for dimer 39K2 excited by 4415.6 A CW He-Cd laser was reported. The vibrational constants of X 1∑g+ and the Te value of C1∏u for 39K2 were obtained by last-square fitting. The spectrum analysis showed that the Te= 22968cm-1 of C1∏u for 39K2 was suitable. The Franck-Condon factors of the (v = 0, J = 105) - (v" = 1-10, J" = 105) transitions for dimer 39K2 were computed by using Morse potentials. The agreement between the computed intensities and the experimental ones was satisfactory. The analysis of r-centroid approximation showed that the changing ratio of the electronic dipole transition moment Be for dimer 39Ka was 0.157~0.168 detye/A(4.22 A