权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

High resolution spectroscopy of multi-electron photoexcitation resonances in a static electric field

静电场中多电子光激发共振的高分辨率光谱

基本信息

批准号：
16540362
负责人：
AZUMA Yoshiro
金额：
$ 2.37万
依托单位：
High Energy Accelerator Research Organization
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540362/
关键词：
synchrotron radiation two electron excitation metastable atom 多電子効果光励起

项目摘要

Helium is the simplest neutral atom with electron-electron correlation. Helium double photoexcitation is the most typical of electron correlation effects, transcending the independent electron approximation, and thus becomes an important theme for atomic physics with synchrotron radiation. Unlike the Stark effect of hydrogen like atoms, the system dominated by electron correlation and the effect of static electric field on the decay process is opening up new directions in the theoretical studies of many electron effects. In the future, studies of two electron excitations and three electron excitation with other rare gases and the lithium atom should provide new fertile ground for research.An important aspect of the experimental methodology of this research is the fluorescence detection and metastable atoms detection utilizing the time structure of the signal obtained during single-bunch operation of synchrotron radiation In order to fully utilize the time structure of the signal, modifications to the apparatus including the supersonic expansion chamber were implemented. They resulted in the greater target dnsity and improved directionality, which enabled the previously difficult fluorescence and metastable atoms detection. Our data indicates strong distortion of the ion yield spectra over the region of N equal to approximately 6, which indicate the emergence of normally forbidden transitions. These all stand out very clearly in the spectra of alternative decay modes including fluorescence and metastables.In addition to the helium data, we obtained preliminary data of the fluorescence from hydrogen molecules which indicate that extension of our methodology to molecules shoud be pursued.

氦是具有电子-电子关联的最简单的中性原子。氦双光激发是电子关联效应中最典型的一种，它超越了独立电子近似，成为同步辐射原子物理研究的重要课题。与类氢原子的斯塔克效应不同，由电子关联和静电场对衰变过程的影响主导的体系为许多电子效应的理论研究开辟了新的方向。本研究实验方法学的一个重要方面是利用同步辐射单束运行过程中获得的信号的时间结构进行荧光探测和亚稳态原子探测，为了充分利用信号的时间结构，对包括超音速膨胀室在内的装置进行了改装。它们导致了更大的目标密度和改善的方向性，这使得以前难以检测到的荧光和亚稳原子成为可能。我们的数据表明，在N约等于6的区域内，离子产额谱发生了强烈的扭曲，这表明出现了正常禁止的跃迁。除了氦的数据外，我们还获得了氢分子的荧光的初步数据，这表明我们的方法应该扩展到分子。