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Observation of Refractive Index line Shape in Ultrafast XUV Transient Absorption Spectroscopy

Ultrafast Science 2023年第4期3卷 25-34页

作者： Mingze Sun Zixiang Jiang Yong Fu Yanrong Jiang Hongtao Hu Chunyuan Bai Zhongyao Yue Jiaming Jiang Hongqiang Xie cheng Jin Ruxin {1. P.B.Corkum D.M.Vileneuvere Ppeng Peng School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210ShanghaiChina Center for Transformative Science ShanghaiTech UniversityShanghai 201210ShanghaiChina Department of applied Physics Nanjing University of Science and TechnologyNanjingJiangsu 210094China Photonics institute Technische Universität WienA-1040 ViennaAustria School of Science East China University of TechnologyNanchangJiangxiChina State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800ShanghaiChina Joint Attosecond Science Laboratory National Research Council and University of Ottawa100 Sussex DriveOttawaON K1A 0R6Canada Department of Physics University of Ottawa25 Templeton St.OttawaON K1N 6N5Canada

Ultrafast extreme ultraviolet (XUV) transient absorption spectroscopy measures the time- and frequencydependent light losses after light–matter interactions. In the linear region, the matter response to an XUV light field is usually determined by the complex refractive index ̃n. The absorption signal is directly related to the imaginary part of ̃n, namely, the absorption index. The real part of ̃n refers to the real refractive index, which describes the chromatic dispersion of an optical material. However, the real refractive index information is usually not available in conventional absorption experiments. Here, we investigate the refractive index line shape in ultrafast XUV transient absorption spectroscopy by using a scheme that the XUV pulse traverses the target gas jet off-center. The jet has a density gradient in the direction perpendicular to the gas injection direction, which induces deflection on the XUV radiation. Our experimental and theoretical results show that the shape of the frequency-dependent XUV deflection spectra reproduces the refractive index line profile. A typical dispersive refractive index line shape is measured for a single-peak absorption;an additional shoulder structure appears for a doublet ***, the refractive index line shape is controlled by introducing a later-arrived near-infrared pulse to modify the phase of the XUV free induction decay, resulting in different XUV deflection spectra. The results promote our understanding of matter-induced absorption and deflection in ultrafast XUV spectroscopy.

关键词： Attosecond transient absorption spectroscopy line shape refractive index High Harmonic Generation

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Dark matter direct search sensitivity of the PandaX-4T experiment

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Science china(Physics,{1. & Astronomy) 2019年第3期62卷 49-57页

作者： HongGuang Zhang Abdusalam Abdukerim Wei Chen Xun Chen YunHua Chen XiangYi Cui BinBin Dong DeQing Fang ChangBo Fu Karl Giboni Franco Giuliani linHui Gu XuYuan Guo ZhiFan Guo Ke Han ChangDa He ShengMing He Di Huang XingTao Huang Zhou Huang Peng Ji XiangDong Ji Yonglin Ju Shaoli li Yao li Heng lin HuaXuan liu JiangLai liu YuGang Ma YaJun Mao KaiXiang Ni JinHua Ning XiangXiang Ren Fang Shi AnDi Tan AnQing Wang cheng Wang HongWei Wang Meng Wang QiuHong Wang SiGuang Wang Xiuli Wang XuMing Wang Zhou Wang MengMeng Wu ShiYong Wu JingKai Xia MengJiao Xiao PengWei Xie BinBin Yan JiJun Yang Yong Yang ChunXu Yu JuMin Yuan JianFeng Yue Dan Zhang Tao Zhang li Zhao QiBin Zheng JiFang Zhou Ning Zhou XiaoPeng Zhou shanghai Key Laboratory for Particle Physics and Cosmology Institute of Nuclear and Particle Physics (INPC) (INPC) and School of Physics and AstronomyShanghai Jiao Tong University School of Physics and Technology Xinjiang University shanghai Key Laboratory for Particle Physics and Cosmology Institute of Nuclear and Particle Physics (INPC) and School of Physics and AstronomyShanghai Jiao Tong University Yalong River Hydropower Development Company Ltd. shanghai {1. of applied Physics Chinese Academy of Sciences School of Mechanical Engineering Shanghai Jiao Tong University School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE)(MOE) Shandong University School of Physics Nankai University Tsung-Dao Lee institute School of Physics Peking University Department of Physics University of Maryland College Park School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong University Center of High Energy Physics Peking University School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology

The Panda X-4T experiment, a 4-ton scale dark matter direct detection experiment, is being planned at the china Jinping Underground Laboratory. In this paper we present a simulation study of the expected background in this experiment. In a 2.8-ton fiducial mass and the signal region between 1.1. keV electron equivalent energy, the total electron recoil background is found to be 4.9 × 1.^(-5) kg^(-1. d^(-1. keV^(-1.. The nuclear recoil background in the same region is 2.8 × 1.^(-7) kg^(-1. d^(-1. keV^(-1.. With an exposure of 5.6 ton-years, the sensitivity of Panda X-4 T could reach a minimum spin-independent dark matter-nucleon cross section of 6 × 1.^(-48) cm^2 at a dark matter mass of 40 Ge V/c^2.

关键词： dark matter WIMPs direct detection xenon

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