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Oscillator strength study of the excitations of valence-shell of C2H2 by high-resolution inelastic x-ray scattering |
| Qiang Sun(孙强)1, Ya-Wei Liu(刘亚伟)2, Yuan-Chen Xu(徐远琛)1, Li-Han Wang(王礼涵)1, Tian-Jun Li(李天钧)1, Shu-Xing Wang(汪书兴)1, Ke Yang(杨科)3,†, and Lin-Fan Zhu(朱林繁)1,‡ |
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 |
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Abstract The oscillator strengths of the valence-shell excitations of C2H2 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 C2H2 at a photon energy of 10 keV. 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 eV is not enough for C2H2 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.
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Received: 22 October 2021
Revised: 30 November 2021
Accepted manuscript online:
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PACS:
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34.80.Gs
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(Molecular excitation and ionization)
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61.05.cf
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(X-ray scattering (including small-angle scattering))
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95.30.Ky
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(Atomic and molecular data, spectra, and spectralparameters (opacities, rotation constants, line identification, oscillator strengths, gf values, transition probabilities, etc.))
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| Fund: 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),and the National Key Research and Development Program of China (Grant No.2017YFA0402300).The support from the Heavy Ion Research Facility in Lanzhou (HIRFL) is also acknowledged.The IXS experiment was performed at the BL12XU of SPring-8 with the approval of Japan Synchrotron Radiation Research Institute (Proposal No.2019A4275) and "National" Synchrotron Radiation Research Center,Taiwan,China (Proposal No.2019-2-089-1). |
Corresponding Authors:
Ke Yang,E-mail:yangke@zjlab.org.cn;Lin-Fan Zhu,E-mail:lfzhu@ustc.edu.cn
E-mail: yangke@zjlab.org.cn;lfzhu@ustc.edu.cn
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| About author: 2021-12-11 |
Cite this article:
Qiang Sun(孙强), Ya-Wei Liu(刘亚伟), Yuan-Chen Xu(徐远琛), Li-Han Wang(王礼涵), Tian-Jun Li(李天钧), Shu-Xing Wang(汪书兴), Ke Yang(杨科), and Lin-Fan Zhu(朱林繁) Oscillator strength study of the excitations of valence-shell of C2H2 by high-resolution inelastic x-ray scattering 2022 Chin. Phys. B 31 053401
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