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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 Li 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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On ηc line shape in charmonium transitions

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Chinese Physics C 2009年第8期33卷 617-621页

作者：平荣刚 Institute of High Energy Physics Chinese Academy of Sciences PO Box 918(1.)

The line shapes to observe ηc in charmonium transitions, i.e., ψ（2S）, J/ψ→γηc, are investigated. The ηc line shapes in exclusive decays or by observing the inclusive photon spectrum are given. The sensitivities to measure the ηc resonance parameters are also evaluated. With more than two thousand ηc events observed, the precision of the ηc decay width measurement will be improved by better than 3%. However, the uncertainties associated with the ηc modified line shapes will dominate the systematic errors and this will prohibit precision mass and width measurements.

关键词： ηc line shape charmonium transition

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Second-order phase correction of NMR spectra acquired using linear frequency-sweeps

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Magnetic Resonance Letters 2022年第1期2卷 1-8,I0002页

作者： Zhehong Gan Ivan Hung National High Magnetic Field Laboratory 1800 East Paul Dirac DriveTallahasseeFL32310USA

NMR spectra acquired with experiments using frequency-sweeps such as the wide-band uniform-rate smooth truncation(WURST)spin-echo and Carr-Purcell-Meiboom-Gill(CPMG)sequences cannot be absorptively phased by using only conventional zerothand first-order phase *** of phase correction up to the secondorder is described for obtaining absorptive spectra,which have more desirable line shapes and noise properties than magnitude *** relationship of the second-order phase to the parameters of frequency sweeps is *** second-order phasing in the frequency-domain is equivalent to a point spread in the time-domain *** application of second-order phase correction is demonstrated with a wideline 35Cl CPMG spikelet spectrum.

关键词： Second-order phase Noise line shape Absorptive Dispersive Frequency sweep CHIRP WURST Adiabatic Broadband CPMG Spin-echo Wideline ^(35)Cl

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