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通过193nm光解丁烯酮分子产生乙烯基自由基(·C2H3).经射流冷却后,以另一束可调谐激光光解·C2H3,生成的氢原子碎片经共振增强多光子电离(REMPI)过程,记录氢离子信号随光解波长变化,得到21180￣21320cm-1范围内乙烯基A!2A″(!′5,6,8=1)←X!2A′(!″=0)跃迁的振转光谱.结合量化计算和光谱拟合,对该段光谱进行了细致的振转分析,确定了各振动谱带位置,识别了其中主要的转动跃迁.由光谱拟合得到各振动能级的预解离寿命,讨论了其与振动模式及激发转动量子数的依赖关系,证实了理论预测的乙烯基A!2A″电子态的面内解离机制.
The vinyl radical (· C2H3) is produced by the photodissociation of ketene at 193 nm. After the jet is cooled, another hydrogen atom fragment of C2H3 is photodissociated with another tunable laser to generate a resonance enhanced multiphoton ionization (REMPI) process , The change of the hydrogen ion signal with the photolysis wavelength was recorded, and the vibration of the vinyl A 2A “(! 5,6,8 = 1) ← X 2A ’(!” = 0) transition in the range of 21180-21320 cm -1 was recorded The spectra were analyzed by quantitative analysis and spectral fitting, and the vibration spectra of the segment were analyzed carefully, the positions of the vibration bands were identified, and the main rotational transitions were identified. The pre-vibration Dissociated from life, and its dependence on the vibrational mode and the number of excitation and rotation quantums was discussed. The in-plane dissociation mechanism of the theoretical vinyl A 2A "electron state was confirmed.