A STUDY OF DESTRUCTION OF HIGHLY EXCITED MOLECULAR IONS PRODUCED IN THE EXTREME-ULTRAVIOLET REGION

从伴随电子关联效应的高激发态分子化学的角度来看，除了研究多激发态离子，即光电离卫星外，研究约25 eV以上能量的光吸收激发的分子高激发态也是非常重要的。本研究的目的是通过碎片光离子与电子激发的中性碎片的荧光的符合测量，寻找识别和观察这种分子高激发态产生和衰变过程的光谱方法。通过上述实验装置的搭建，特别是由脉冲电磁气体喷嘴、荧光探测器、飞行时间质量和…组成的符合光谱仪，很好地实现了本研究的目的更多的催化器，安装在目前可用的高真空真空室中，用于气相分子与极端紫外线光子束的碰撞。通过研制、调谐和使用该装置，在筑波国家高能物理实验室光子厂利用单色化同步辐射对典型的双原子分子，如氢和氮进行了研究。至于氮的结果，已经证明高激发离子解离成碎片离子(N^+)和电子激发的中性碎片(N^；**&gt；)对应于从内价轨道发射电子而产生的离子，这是以前几乎没有得到的信息。详细测量了碎片离子与荧光光子的共生激发函数随激发光子能量的变化。此外，它还成功地揭示了具有各种对称性的离子态的产生，即相对于同步辐射的极化轴的角度相关共振谱。这些都清楚地证明了单电子离子状态与多激发中性分子之间的强相关性。在此基础上，进行了分散荧光的测量。结果表明，离子碎片的荧光贡献很大，某一分子离子状态与某一碎片对有关；对于氢，符合谱表明，一电子离子状态与另一电子激子解离为H^+和H^&lt；**&gt；，并通过测量二维符合谱对其进行了详细的研究。通过使用静电分析器对碎片离子进行动能分析，获得了更详细的信息。较少

As well as the study of the multiply excited ionic states, i.e., the photoionization satellites, the study of molecular highly excited states excited by the photoabsorption of the energy above ca. 25 eV is quite improtant from the view point of the chemistry of highly excited molecules accompanying the electron correlation effect. The purpose of the present investigation has been to delope the spectroscopic method to identify and to observe the production and decay processes of such molecular highly excited states through the coincident measurments of the fragment photoions with the fluorescence from electronically excited neutral fragments. As shown below the purpose of the present investagation has been well accomplished.The present investigation has been carried out through the constructioin of the above mentioned experimental apparatus, nemely, a coincidence spectrometer, which is composed of a pulsed electromagnetic gas nozzle, a fluorescence detector, and a time-of-flight mass an … More alyzer and installed in a presently available highly evacuated vacuum chamber for collision of gas phase molecules with an extreme-ultraviolet photon beam. By developing, tuning, and using this apparatus, the investigation of entitled study has been performed for the tyipical diatomic molecules, such as hydrogen and nitrogen, by employing the monochromatized synchortron radiation at the Photon Factroy, the National Laboratory for High Energy Physics, Tsukuba.As for the results for nitrogen, the highly excited ions dissociating into a fragment ion (N^+) and an electronically excited neutral fragment (N^<**>) has been shown to correspond to the ions produced by the emission of electron from an inner valence orbital, with which almost no information was obtained previously. The detailed measurements of coincinent excitation funtin of fragment ions with fluorescence photons as a function of excitation photon energy have been performed. Also it has been successfully performed to reveal the production of ionic states with various symmetries the angular dependent coinicidence spectroscopy with respect to the polarization axis of synchrotron radiation. These have been the clear evidence showing the strong correlation between the one-electron ionic states and the multiply excited neutral molecules. Based on this rsult, the measurement of dispersed fluorescnce has been perfomed. It has been shown that a significant contribution of the fluorescence from ionic fragments is involved and that a certain molecular ionic state correlates to a certain fragment pair.As for the results for hydrogen, the coincidence spectra have shown that the one-electron ionic states with another one-electron excitetaion dissociate into a H^+ and a H^<**>, for which a detailed investigation has been performed by the measurements two dimensional coincidence spectroscopy. Further detailed information has been obtaine by the kinetic energy analysis of fragment ions using an electrostatic analyzer. Less