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Tikhonov DS. Regularized weighted sine least-squares spectral analysis for gas electron diffraction data. J Chem Phys 2023; 159:174101. [PMID: 37909450 DOI: 10.1063/5.0168417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 10/12/2023] [Indexed: 11/03/2023] Open
Abstract
Here, we present a new approach for obtaining radial distribution functions (RDF) from the electron diffraction data using a regularized weighted sine least-squares spectral analysis. It allows for explicitly transferring the measured experimental uncertainties in the reduced molecular scattering function to the produced RDF. We provide a numerical demonstration, discuss the uncertainties and correlations in the RDFs, and suggest a regularization parameter choice criterion. The approach is also applicable for other diffraction data, e.g., for x-ray or neutron diffraction of liquid samples.
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Affiliation(s)
- Denis S Tikhonov
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
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Zhang M, Guo Z, Mi X, Li Z, Liu Y. Ultrafast Imaging of Molecular Dynamics Using Ultrafast Low-Frequency Lasers, X-ray Free Electron Lasers, and Electron Pulses. J Phys Chem Lett 2022; 13:1668-1680. [PMID: 35147438 DOI: 10.1021/acs.jpclett.1c03916] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The requirement of high space-time resolution and brightness is a great challenge for imaging atomic motion and making molecular movies. Important breakthroughs in ultrabright tabletop laser, X-ray, and electron sources have enabled the direct imaging of evolving molecular structures in chemical processes, and recent experimental advances in preparing ultrafast laser and electron pulses resulted in molecular imaging with femtosecond time resolution. This Perspective presents an overview of the versatile imaging methods of molecular dynamics. High-order harmonic generation imaging and photoelectron diffraction imaging are based on laser-induced ionization and rescattering processes. Coulomb explosion imaging retrieves molecular structural information by detecting the momentum vectors of fragmented ions. Diffraction imaging encodes molecular structural and electronic information in reciprocal space. We also present various applications of these ultrafast imaging methods in resolving laser-induced nuclear and electronic dynamics.
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Affiliation(s)
- Ming Zhang
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Zhengning Guo
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Xiaoyu Mi
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Zheng Li
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
- Yangtze Delta Institute of Optoelectronics, Peking University, Nantong 226010, China
| | - Yunquan Liu
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
- Center for Applied Physics and Technology, HEDPS, Peking University, Beijing 100871, China
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Aseyev SA, Ischenko AA, Kompanets VO, Kochikov IV, Malinovskii AL, Mironov BN, Poydashev DG, Chekalin SV, Ryabov EA. Study of the Processes Induced by Femtosecond Laser Radiation in Thin Films and Molecular-Cluster Beams Using Ultrafast Electron Diffraction. CRYSTALLOGR REP+ 2021. [DOI: 10.1134/s106377452106002x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ischenko AA, Kochikov IV, Miller RJD. The effect of Coulomb repulsion on the space-time resolution limits for ultrafast electron diffraction. J Chem Phys 2019; 150:054201. [PMID: 30736672 DOI: 10.1063/1.5060673] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The development of electron sources capable of temporal resolution on the order of 1 ps or less raises a number of questions associated with the estimation of the physical meaning and accuracy of the dynamic parameters based on the analysis of time-dependent scattering intensity. The use of low brightness ultrashort pulses with few electrons leads to the necessity for increasing the total exposure time and lengthening the time of data acquisition, with attendant problems with the limited sample. The sample restrictions can be mitigated by increasing the charge per pulse, i.e., by going to high brightness sources. Increasing in the number of electrons, however, is limited by the Coulomb repulsion between them, which leads on one hand to distortion of the diffraction pattern and on the other hand to an increase in the duration of the pulse. An analytical technique for estimating the deformation of the diffraction pattern caused by the Coulomb repulsion of the electrons in electron bunches with duration of less than 10 ps and the influence of this effect on the accuracy of determination of the interatomic distances is developed for the non-relativistic and relativistic regimes for electron energies.
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Affiliation(s)
- A A Ischenko
- Institute of Fine Chemical Technologies named after M.V. Lomonosov, Russian Technological University-MIREA, Prosp. Vernadskogo 86, 119571 Moscow, Russian Federation
| | - I V Kochikov
- Research Computing Center, Lomonosov Moscow State University, 119899 Moscow, Russian Federation
| | - R J Dwayne Miller
- The Max Planck Institute for the Structure and Dynamics of Matter Hamburg, Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
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Ischenko AA, Weber PM, Miller RJD. Capturing Chemistry in Action with Electrons: Realization of Atomically Resolved Reaction Dynamics. Chem Rev 2017; 117:11066-11124. [DOI: 10.1021/acs.chemrev.6b00770] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Anatoly A. Ischenko
- Institute
of Fine Chemical Technologies, Moscow Technological University, Vernadskogo
86, 119571 Moscow, Russia
| | - Peter M. Weber
- Department
of Chemistry, Brown University, 324 Brook Street, 02912 Providence, Rhode Island, United States
| | - R. J. Dwayne Miller
- The Max Planck Institute for the Structure and Dynamics of Matter, Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
- Departments
of Chemistry and Physics, University of Toronto, 80 St. George, M5S 3H6 Toronto, Canada
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Ischenko AA. Effect of vibronic interactions on molecular structures determined by gas electron diffraction. Struct Chem 2015. [DOI: 10.1007/s11224-015-0667-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Theory and Data Analysis in Time-Resolved Electron Diffraction. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/b978-0-12-800145-5.00001-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Aseyev SA, Weber PM, Ischenko AA. Ultrafast Electron Microscopy for Chemistry, Biology and Material Science. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jasmi.2013.31005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kochikov IV, Tarasov YI, Ivanov AA. On determination of the response characteristics of detectors used in gas electron diffraction. J STRUCT CHEM+ 2007. [DOI: 10.1007/s10947-007-0084-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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