Study of radiation induced ultra-fast charge transfer in condensed matter

飞秒脉冲辐射分解系统的可测波长由近红外扩展到紫外。研究了具有代表性的非极性液体正十二烷中的双离子复合。结果发现了一个间接的证据，证明自由基阳离子是由电离产生的。通过芳香族清除剂的研究，发现所激发的自由基阳离子具有较高的反应活性。自由基阳离子的摩尔吸收系数和g值分别为13950M-1cm-1和2.5。得到了正十二烷初始电离产率的g值为4.5。在240 nm处观察了烷基自由基的形成过程，得到了7 ps的形成时间，发现激发的自由基阳离子可能参与了十二烷的辐射分解。它是量子束科学和辐射化学的重要知识。

Measurable wavelength of a femtosecond pulse radiolysis system was extended to ultraviolet from near-infrared region. Geminate ion recombination was researched in n-dodecane which is representative nonpolar liquids. As results, an indirect evidence of an excited radical cation which generated primary by ionization was found. By using an aromatic scavenger, it was revealed that the excited radical cation has high reactivity. Molar absorption coefficient and G-value of the radical cation was estimated as 13950M-1cm-1 and 2.5 respectively. And then, G-value of initial ionization yield in n-dodecane was disclosed as 4.5. Formation process of alkyl radicals was observed at 240 nm, and got formation time at 7 ps. It was found the possibility that the excited radical cation is involved in radiolysis of dodecane. It is very important knowledge for the quantum beam science and radiation chemistry.