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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,用另一束激光光解·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20020～20070cm-1范围内乙烯基激发的转动分辨光谱.该谱对应于A$2A″(v′=0)%X$2A′(v″=0)跃迁的转动结构.结合量子化学理论计算、光谱拟合以及前人的研究结果,对该段光谱进行了完整的转动识别,确定了40条转动谱线的位置.由光谱拟合还得到A$2A″(v′=0)能级的预解离寿命为3.3ps,且不依赖于转动量子数.
The vinyl radical (· C2H3) was generated by the photodissociation of ketene at 193 nm. After cooling by jetting, · C2H3 was photodissocated with another laser to generate a fragment of hydrogen atoms by resonance enhanced multiphoton ionization (REMPI) The hydrogen ion signal changes with the photolysis wavelength to obtain the rotational resolution spectrum of vinyl excitation in the range of 20020 ~ 20070cm-1, which corresponds to A $ 2A “(v ’= 0)% X $ 2A’ (v” = 0) And the rotational structure of the transition.According to the calculation of quantum chemistry, spectral fitting and the results of previous studies, the rotation of the spectrum was completely identified and the position of 40 rotation lines was determined.A $ 2 A "(v ’= 0) level pre-release life of 3.3ps, and does not depend on the number of rotating quantum.