Formation of free radicals and their structures

这个项目是为了了解自由基的形成及其结构而进行的。重点研究了(1)利用同步辐射和激光光吸收产生的激发态分子的解离，(2)通过电子-分子碰撞产生的激发态分子的解离，(3)自由基与分子的反应，(4)新自由基的高分辨率光谱。各种新发展的实验方法为自由基的形成和结构提供了许多信息。通过测量二维发射光谱和光吸收、光电离和中性离解截面的绝对值，Hatano获得了超激发分子离解动力学的详细信息。本间用激光半反应技术研究了几何形状对反应动力学的影响。Ebata利用光碎片产率光谱结合双共振激发，成功地分析了CO的高（n * 5） Rydberg态的旋转结构，并研究了它们的预解过程。远藤用脉冲放电喷嘴法对自由基配合物和分子离子配合物进行了高分辨率光谱分析，揭示了它们的结构和分子间电位。Mikami用红外-紫外双共振光谱法测定了苯酚与各种溶剂分子的氢键配合物的结构。

This project was carried out for the purpose of understanding the formation of free radicals and their structures. Emphasis was placed on studies of (1) dissociation of excited molecules produced by photoabsorption by means of synchrotron radiation and lasers, (2) dissociation of excited molecules produced through electron-molecule collisions, (3) reactions of free radicals with molecules, (4) high-resolution spectroscopy of new free radicals. A variety of newly developed experimental methods provided much information on the formation and structure of free radicals as follows.Hatano obtained detailed information on dissociation dynamics of superexcited molecules through measurements of the two-dimensional emission spectra and absolute values of photoabsorption, photoionization and neutral-dissociation cross sections.Honma studied effects of geometry on the reaction dynamics by employing the laser-initiated half-reaction technique.Ebata succeeded in analyzing rotational structure of high (n * 5) Rydberg states of CO and studying their predissociation process by using photofragment yield spectroscopy combined with double resonant excitation.Endo carried out high resolution spectroscopy of radical complexes and molecular ion complexes by using pulsed discharge nozzle method and revealed their structures and intermolecular potentials.Mikami determined the structures of hydrogen-bonded complexes of phenol with various solvent molecules by means of IR-UV double resonance spectroscopy.