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在 76 4 0 0～ 796 5 0cm-1的能量范围内测量了三氯乙烯的真空紫外脉冲场电离 光电子 (VUV PFI PE)谱 .根据量子化学理论计算的频率以及Franck Condon因子 ,对VUV PFI PE谱的振动谱带进行了标定 ,确认了11个三氯乙烯阳离子的振动频率 ,分别为 :ν1+ =14 8cm-1,ν2 + =180cm-1,ν3 + =2 86cm-1,ν4+ =4 0 2cm-1,ν5+=4 72cm-1,ν6+ =6 6 0cm-1,ν7+ =875cm-1,ν8+ =990cm-1,ν9+ =10 38cm-1,ν10 + =12 6 7cm-1,ν11+ =14 0 8cm-1.这些测量和新近用真空紫外 红外光诱导电离确定的ν12 + =30 73cm-1一起 ,提供了三氯乙烯阳离子电子基态的所有 12个振动频率的实验值 .通过对VUV PFI PE谱 (0 ,0 )跃迁带的光谱拟合 ,确定了三氯乙烯的电离能为(76 4 4 1.7± 2 .0 )cm-1((9.4 776± 0 .0 0 0 2 )eV) .
The VUV PFI PE spectrum of trichlorethylene was measured in the energy range of 76 4 0 0 ~ 796 5 0cm-1. According to the calculated frequency and the Franck-Condon factor of trichlorethylene, the VUV PFI PE The vibrational bands of the spectra were calibrated and the vibrational frequencies of the 11 trichlorethylene cations were confirmed: ν1 + = 14 8cm -1, ν2 + = 180cm -1, ν3 + = 2 86cm -1, ν4 + = 40 Ν5 + = 4 72 cm -1, ν 6+ = 6 6 0 cm -1, ν 7+ = 875 cm -1, ν 8+ = 990 cm -1, ν 9+ = 10 38 cm -1, ν 10+ = 12 6 7 cm -1, 0 8cm-1 These measurements, along with the newly determined ν12 + = 3073cm-1 by ion-induced ionization by vacuum ultraviolet (UV) light, provide experimental values for all 12 vibrational frequencies of the trichlorethylene cationic ground state. The ionization energy of trichlorethylene was determined to be (76 4 4 1.7 ± 2 .0) cm -1 (9.4 776 ± 0 .0 0 0 2) eV by spectral fitting of spectral (0, 0) transition bands.