Oscillator strength study of the excitations of valence-shell of C2H2 by high-resolution inelastic x-ray scattering  

作　　者：Qiang Sun Ya-Wei Liu Yuan-Chen Xu Li-Han Wang Tian-Jun Li Shu-Xing Wang Ke Yang Lin-Fan Zhu 孙强;刘亚伟;徐远琛;王礼涵;李天钧;汪书兴;杨科;朱林繁(Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;Anhui Province Key Laboratory of Medical Physics and Technology,Institute of Health and Medical Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230026,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)

机构地区：[1]Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [2]Anhui Province Key Laboratory of Medical Physics and Technology,Institute of Health and Medical Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230026,China [3]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China

出　　处：《Chinese Physics B》2022年第5期261-264,共4页中国物理B（英文版）

基　　金：Project supported by the Strategic Priority Research Program of the Chinese Academy of Science(Grant No.XDB34000000);the National Natural Science Foundation of China(Grant Nos.U1932207 and 12104437);the National Key Research and Development Program of China(Grant No.2017YFA0402300);The support from the Heavy Ion Research Facility in Lanzhou(HIRFL);the BL12XU of SPring-8 with the approval of Japan Synchrotron Radiation Research Institute(Proposal No.2019A4275);“National”Synchrotron Radiation Research Center,Taiwan,China(Proposal No.2019-2-089-1)。

摘　　要：The oscillator strengths of the valence-shell excitations of C_(2)H_(2) are extremely important for testing theoretical models and studying interstellar gases.In this study,the high-resolution inelastic x-ray scattering(IXS)method is adopted to determine the generalized oscillator strengths(GOSs)of the valence-shell excitations of C_(2)H_(2) at a photon energy of10 ke V.The GOSs are extrapolated to their zero limit to obtain the corresponding optical oscillator strengths(OOSs).Through taking a completely different experimental method of the IXS,the present results offer the high energy limit for electron collision to satisfy the first Born approximation(FBA)and cross-check the previous experimental and theoretical results independently.The comparisons indicate that an electron collision energy of 1500 e V is not enough for C_(2)H_(2) to satisfy the FBA for the large squared momentum transfer,and the line saturation effect limits the accuracy of the OOSs measured by the photoabsorption method.

关 键 词：C_(2)H_(2) inelastic x-ray scattering dynamic parameters 

分 类 号：P148[天文地球—天体物理]