Formation of Molecular Superexcited States and Their Dissociation Dynamics

我们已经建立了一种新的实验方法，即共同的电子-能量-损失光谱学，以研究分子超兴奋状态的分子分化动态，特别是光学超兴奋状态的光-不可阻挡的超兴奋状态。一个紫外光探测器和一个同步计数系统将与一个专门设计的电子-能量-损失-光谱仪系统结合在一起，用于气体相位。An electron energy-loss spectrum of hey D22 y D2 in coincidence with H（2 p） formation，i.e. a coincident energy-loss spectrum， have then successfully been obtained after careful experimental optimization of experimental conditions and developing a unique normalization procedure for coincidence counting rates。通过使用此方法，我们测量了一个电子能量损失光谱的双重兴奋状态的H-D22的第一次。它应该被描述为一个大的峰值，以达到令人难忘的双重兴奋状态的H-D22 Y-D2在共同能量损失光谱中观察到的位置和形状都没有被解释。 ... More 一个传统的理论，它被刺激了一些实验，就像理论科学家一样。Isotope effManagement in the coincident energy-loss spectra of doubly excited states of H·D22·D2 were also investigated。The coincident energy-loss spectrum of highly excited states of hy y d22 y D2 near the first ionization potential weasured at the lower incident electron energy，i.e.30 eV。H（2 p）的分支比率的形成被发现比其他允许的国家更高，而这些国家如d、k、n和f国家。自1999年以来，对N-D22-D2的测量，作为一个扩展到多电子系统，已经开始了。使用同步加速器辐射的各种实验被用于调查分离动力学的光学允许的超兴奋状态：关于光吸收、光电离和中性分离交叉部分的精确测量，即分散的紫外荧光激发特别（2DFES），和离子荧光协同测量。在添加它们的同时，我们最近成功地测量了分散的紫外线/可见荧光激发特性，通过位置敏感检测技术对分散动力学进行全面的调查。集体去激发稀有气体原子和电子离子重组过程的过程，在超级兴奋状态发挥重要的作用作为反应中介也被脉冲放射性技术所激发。Less（低）

We have established a new experimental method, i.e. the coincident electron-energy-loss spectroscopy, to investigate dissociation dynamics of molecular superexcited states, especially that of optically-forbidden superexcited states. A vuv photon detector and a coincidence counting system are combined with a specially-designed electron-energy-loss-spectroscopy system for gas phase. An electron energy-loss spectrum of HィイD22ィエD2 in coincidence with H(2p) formation, i.e. a coincident energy-loss spectrum, have then successfully been obtained after careful optimization of experimental conditions and developing a unique normalization procedure for coincidence counting rates. By using this method, we measured an electron energy-loss spectrum of doubly excited states of HィイD22ィエD2 for the first time. It should be emphasized that a large peak due to the forbidden doubly-excited states of HィイD22ィエD2 is observed in the coincident energy-loss spectrum whose position and shape are not explained by … More a conventional theory, which has stimulated some experimental as well as theoretical scientists. Isotope effects in the coincident energy-loss spectra of doubly excited states of HィイD22ィエD2 and DィイD22ィエD2 were also investigated. The coincident energy-loss spectrum of highly excited states of HィイD22ィエD2 near the first ionization potential was measured at the lower incident electron energy, i.e. 30eV. The branching ratio of H(2p) formation is found to be higher for optically forbidden states such as the d, k, n and f states than other allowed states. Since 1999, the measurement for NィイD22ィエD2, as an extension to multi-electron systems, has been started.Various experiments by using synchrotron radiation were done to investigate the dissociation dynamics of optically allowed superexcited states : the precise measurement of photoabsorption, photoionization and neutral dissociation cross sections, that of dispersed vuv-fluorescence excitation spectra (2D FES), and ion-fluorescence coincidence measurement. In addition to them, we have recently succeeded in measuring a dispersed uv/visible-fluorescence excitation spectra by position sensitive detection technique to investigate the dissociation dynamics comprehensively.Collisional deexcitation processes of excited rare gas atoms and electron-ion recombination processes, where the superexcited states play an important role as reaction intermediates have also been investigated by the pulse radiolysis technique. Less