1
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Behrens M, Englert L, Bayer T, Wollenhaupt M. XUV-beamline for photoelectron imaging spectroscopy with shaped pulses. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:093101. [PMID: 39287480 DOI: 10.1063/5.0223450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Accepted: 09/03/2024] [Indexed: 09/19/2024]
Abstract
We introduce an extreme ultraviolet (XUV)-beamline designed for the time-resolved investigation and coherent control of attosecond (as) electron dynamics in atoms and molecules by polarization-shaped as-laser pulses. Shaped as-pulses are generated through high-harmonic generation (HHG) of tailored white-light supercontinua (WLS) in noble gases. The interaction of shaped as-pulses with the sample is studied using velocity map imaging (VMI) techniques to achieve the differential detection of photoelectron wave packets. The instrument consists of the WLS-beamline, which includes a hollow-core fiber compressor and a home-built 4f polarization pulse shaper, and the high-vacuum XUV-beamline, which combines an HHG-stage and a versatile multi-experiment vacuum chamber equipped with a home-built VMI spectrometer. The VMI spectrometer allows the detection of photoelectron wave packets from both the multiphoton ionization (MPI) of atomic or molecular samples by the tailored WLS-pulses and the single-photon ionization (SPI) by the shaped XUV-pulses. To characterize the VMI spectrometer, we studied the MPI of xenon atoms by linearly polarized WLS pulses. To validate the interplay of these components, we conducted experiments on the SPI of xenon atoms with linearly polarized XUV-pulses. Our results include the reconstruction of the 3D photoelectron momentum distribution (PMD) and initial findings on the coherent control of the PMD by tuning the spectrum of the XUV-pulses with the spectral phase of the WLS. Our results demonstrate the performance of the entire instrument for HHG-based photoelectron imaging spectroscopy with prototypical shaped pulses. Perspectively, we will employ polarization-tailored WLS-pulses to generate polarization-shaped as-pulses.
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Affiliation(s)
- M Behrens
- Institut für Physik, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany
| | - L Englert
- Institut für Physik, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany
| | - T Bayer
- Institut für Physik, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany
| | - M Wollenhaupt
- Institut für Physik, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany
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2
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Borgeaud Dit Avocat DP, Yang H, Nitsche A, Wenger J, Yoder BL, Signorell R. Out-of-focus spatial map imaging of magnetically deflected sodium ammonia clusters. Phys Chem Chem Phys 2024; 26:16972-16979. [PMID: 38842057 PMCID: PMC11186454 DOI: 10.1039/d4cp00788c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 05/23/2024] [Indexed: 06/07/2024]
Abstract
This paper introduces out-of-focus spatial map imaging (SMI) as a detection method for magnetic deflection of molecular/cluster beams, using Nam(NH3)n to illustrate its capabilities. This method enables imaging of the complete spatial distribution, simplifying measurements and allowing for cluster-size-resolved analysis by shifting away from traditional in-focus SMI conditions. Incorporating out-of-focus SMI with TOF-MS and velocity map imaging into a single setup allows for direct assessment of clusters' magnetic moments without needing to pre-select velocities. Key findings include a slower relaxation for Na(NH3)4 compared to Na(NH3)3 and Na(NH3)5, unexpectedly high deflection for larger clusters up to Na(NH3)9, hinting at changes in cluster dynamics as the first solvation shell closes. The study also covers the first measurements of Na2(NH3)1 and Na3(NH3)n, showing distinct deflection behaviors and underscoring the improved capabilities of the new detection method.
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Affiliation(s)
| | - H Yang
- Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
| | - A Nitsche
- Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
| | - J Wenger
- Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
| | - B L Yoder
- Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
| | - R Signorell
- Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
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3
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Ma Q, Liu J, Pan Z, Wu X, Lu H, Wang Z, Xia Y, Chen Y, Miller KG, Xu X, Yan X. Generation of attosecond gigawatt soft x-ray pulses through coherent Thomson backscattering. Phys Rev E 2024; 109:065205. [PMID: 39020960 DOI: 10.1103/physreve.109.065205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 05/17/2024] [Indexed: 07/20/2024]
Abstract
Collision between relativistic electron sheets and counterpropagating laser pulses is recognized as a promising way to produce intense attosecond x rays through coherent Thomson backscattering (TBS). In a double-layer scheme, the electrons in an ultrathin solid foil are first pushed out by an intense laser driver and then interact with the laser reflected off a second foil to form a high-density relativistic electron sheet with vanishing transverse momentum. However, the repulsion between these concentrated electrons can increase the thickness of the layer, reducing both its density and subsequently the coherent TBS. Here, we present a systematic study on the evolution of the flying electron layer and find that its resulting thickness is determined by the interplay between the intrinsic space-charge expansion and the velocity compression induced by the drive laser. How the laser driver, the target areal density, the reflector, and the collision laser intensity affect the properties of the produced x rays is explored. Multidimensional particle-in-cell simulations indicate that employing this scheme in the nonlinear regime has the potential to stably produce soft x rays with several gigawatt peak power in hundreds of terawatt ultrafast laser facilities. The pulse duration can be tuned to tens of attoseconds. This compact and intense attosecond x-ray source may have broad applications in attosecond science.
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Affiliation(s)
- Qianyi Ma
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Jiaxin Liu
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Zhuo Pan
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Xuezhi Wu
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Huangang Lu
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Zhenan Wang
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Yuhui Xia
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Yuekai Chen
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
| | | | - Xinlu Xu
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
- Beijing Laser Acceleration Innovation Center, Huairou, Beijing, 101400, China
| | - Xueqing Yan
- State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University, Beijing 100871, China
- Beijing Laser Acceleration Innovation Center, Huairou, Beijing, 101400, China
- CICEO, Shanxi University, Taiyuan, Shanxi 030006, China
- Institute of Guangdong Laser Plasma Technology, Baiyun, Guangzhou, 510540, China
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4
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Biró L, Csehi A. Attosecond Probing of Nuclear Vibrations in the D 2+ and HeH + Molecular Ions. J Phys Chem A 2024; 128:858-867. [PMID: 38277484 DOI: 10.1021/acs.jpca.3c07031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2024]
Abstract
We study the ultrafast photodissociation of small diatomic molecules using attosecond laser pulses of moderate intensity in the (extreme) ultraviolet regime. The simultaneous application of subfemtosecond laser pulses with different photon energies─resonant in the region of the molecular motion─allows one to monitor the vibrational dynamics of simple diatomics, like the D2+ and HeH+ molecular ions. In our real-time wave packet simulations, the nuclear dynamics is initiated either by sudden ionization (D2+) or by explicit pump pulses (HeH+) via distortion of the potential energy of the molecule. The application of time-delayed attosecond pulses leads to the breakup of the molecules, and the information on the underlying bound-state dynamics is imprinted in the kinetic energy release (KER) spectra of the outgoing fragments. We show that the KER-delay spectrograms generated in our ultrafast pump-probe schemes are able to reconstruct the most important features of the molecular motion within a given electronic state, such as the time period or amplitude of oscillations, interference patterns, or the revival and splitting of the nuclear wave packet. The impact of probe pulse duration, which is key to the applicability of the presented mapping scheme, is investigated in detail.
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Affiliation(s)
- László Biró
- Department of Theoretical Physics, Faculty of Science and Technology, University of Debrecen, H-4002 Debrecen, P.O. Box 400, Hungary
| | - András Csehi
- Department of Theoretical Physics, Faculty of Science and Technology, University of Debrecen, H-4002 Debrecen, P.O. Box 400, Hungary
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5
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Goudreau ES, Boguslavskiy AE, Moffatt DJ, Makhija V, Hemsworth M, Lausten R, Marceau C, Wilkinson I, Stolow A. Time-stretched multi-hit 3D velocity map imaging of photoelectrons. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:063002. [PMID: 37862509 DOI: 10.1063/5.0149897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 05/30/2023] [Indexed: 10/22/2023]
Abstract
The 2D photoelectron velocity map imaging (VMI) technique is commonly employed in gas-phase molecular spectroscopy and dynamics investigations due to its ability to efficiently extract photoelectron spectra and angular distributions in a single experiment. However, the standard technique is limited to specific light-source polarization geometries. This has led to significant interest in the development of 3D VMI techniques, which are capable of measuring individual electron positions and arrival times, obtaining the full 3D distribution without the need for inversion, forward-convolution, or tomographic reconstruction approaches. Here, we present and demonstrate a novel time-stretched, 13-lens 3D VMI photoelectron spectrometer, which has sub-camera-pixel spatial resolution and 210 ps (σ) time-of-flight (TOF) resolution (currently limited by trigger jitter). We employ a kHz CMOS camera to image a standard 40 mm diameter microchannel plate (MCP)/phosphor anode detector (providing x and y positions), combined with a digitizer pick-off from the MCP anode to obtain the electron TOF. We present a detailed analysis of time-space correlation under data acquisition conditions which generate multiple electrons per laser shot, and demonstrate a major advantage of this time-stretched 3D VMI approach: that the greater spread in electron TOFs permits for an accurate time- and position-stamping of up to six electrons per laser shot at a 1 kHz repetition rate.
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Affiliation(s)
- E Scott Goudreau
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Andrey E Boguslavskiy
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | | | - Varun Makhija
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- Department of Physics, University of Mary Washington, Fredericksburg, Virginia 22401, USA
| | - Michael Hemsworth
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Rune Lausten
- National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Claude Marceau
- National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Iain Wilkinson
- Institute for Electronic Structure Dynamics, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz-1, D-14109 Berlin, Germany
| | - Albert Stolow
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- NRC-uOttawa Joint Centre for Extreme Photonics, Ottawa, Ontario K1A 0R6, Canada
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6
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Yifrach Y, Baraban JH, Bar I. Kinetic Energy-Broadened Spatial Map Imaging for Recovering Dynamical Information. J Phys Chem A 2022; 126:6767-6779. [DOI: 10.1021/acs.jpca.2c04444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Maxwell AS, Armstrong GSJ, Ciappina MF, Pisanty E, Kang Y, Brown AC, Lewenstein M, Figueira de Morisson Faria C. Manipulating twisted electrons in strong-field ionization. Faraday Discuss 2021; 228:394-412. [PMID: 33591304 DOI: 10.1039/d0fd00105h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We investigate the discrete orbital angular momentum (OAM) of photoelectrons freed in strong-field ionization. We use these 'twisted' electrons to provide an alternative interpretation on existing experimental work of vortex interferences caused by strong field ionization mediated by two counter-rotating circularly polarized pulses separated by a delay. Using the strong field approximation, we derive an interference condition for the vortices. In computations for a neon target we find very good agreement of the vortex condition with photoelectron momentum distributions computed with the strong field approximation, as well as with the time-dependent methods Qprop and R-Matrix. For each of these approaches we examine the OAM of the photoelectrons, finding a small number of vortex states localized in separate energy regions. We demonstrate that the vortices arise from the interference of pairs of twisted electron states. The OAM of each twisted electron state can be directly related to the number of arms of the spiral in that region. We gain further understanding by recreating the vortices with pairs of twisted electrons and use this to determine a semiclassical relation for the OAM. A discussion is included on measuring the OAM in strong field ionization directly or by employing specific laser pulse schemes as well as utilizing the OAM in time-resolved imaging of photo-induced dynamics.
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Affiliation(s)
- A S Maxwell
- Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK. and ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - G S J Armstrong
- Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast BT7 1NN, Northern Ireland, UK
| | - M F Ciappina
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain and Physics Program, Guangdong Technion - Israel Institute of Technology, Shantou, Guangdong 515063, China and Technion - Israel Institute of Technology, Haifa, 32000, Israel
| | - E Pisanty
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Y Kang
- Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
| | - A C Brown
- Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast BT7 1NN, Northern Ireland, UK
| | - M Lewenstein
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain and ICREA, Pg. Lluís Companys 23, 08010, Spain
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8
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Affiliation(s)
- T. Grohmann
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
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9
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Venzke J, Becker A, Jaron-Becker A. Asymmetries in ionization of atomic superposition states by ultrashort laser pulses. Sci Rep 2020; 10:16164. [PMID: 32999393 PMCID: PMC7527981 DOI: 10.1038/s41598-020-73196-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 09/03/2020] [Indexed: 11/25/2022] Open
Abstract
Progress in ultrafast science allows for probing quantum superposition states with ultrashort laser pulses in the new regime where several linear and nonlinear ionization pathways compete. Interferences of pathways can be observed in the photoelectron angular distribution and in the past they have been analyzed for atoms and molecules in a single quantum state via anisotropy and asymmetry parameters. Those conventional parameters, however, do not provide comprehensive tools for probing superposition states in the emerging research area of bright and ultrashort light sources, such as free-electron lasers and high-order harmonic generation. We propose a new set of generalized asymmetry parameters which are sensitive to interference effects in the photoionization and the interplay of competing pathways as the laser pulse duration is shortened and the laser intensity is increased. The relevance of the parameters is demonstrated using results of state-of-the-art numerical solutions of the time-dependent Schrödinger equation for ionization of helium atom and neon atom.
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Affiliation(s)
- J Venzke
- JILA and Department of Physics, University of Colorado, Boulder, CO, 80309-0440, USA.
| | - A Becker
- JILA and Department of Physics, University of Colorado, Boulder, CO, 80309-0440, USA
| | - A Jaron-Becker
- JILA and Department of Physics, University of Colorado, Boulder, CO, 80309-0440, USA
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10
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Yuan KJ, Bandrauk AD. Ultrafast X-ray photoelectron diffraction in triatomic molecules by circularly polarized attosecond light pulses. Phys Chem Chem Phys 2020; 22:325-336. [DOI: 10.1039/c9cp05213e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We theoretically study ultrafast photoelectron diffraction in triatomic molecules with cyclic geometry by ultrafast circular soft X-ray attosecond pulses.
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Affiliation(s)
- Kai-Jun Yuan
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun
- China
- Laboratoire de Chimie Théorique
| | - André D. Bandrauk
- Laboratoire de Chimie Théorique
- Faculté des Sciences
- Université de Sherbrooke
- Québec
- Canada
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11
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Kwok Y, Chen G, Mukamel S. STM Imaging of Electron Migration in Real Space and Time: A Simulation Study. NANO LETTERS 2019; 19:7006-7012. [PMID: 31509425 DOI: 10.1021/acs.nanolett.9b02389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Using a simulation protocol that mimics ultrafast scanning tunneling microscopy (STM) experiments, we demonstrate how pump-probe ultrafast STM may be used to image electron migration in molecules. Two pulses are applied to a model system, and the time-integrated current through the tip is calculated versus the delay time and tip position to generate STM images. With suitable pump and probe parameters, the images can track charge migration with atomistic spatial and femtosecond temporal resolutions.
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Affiliation(s)
- YanHo Kwok
- Department of Chemistry , The University of Hong Kong , Pofkulam Road , Hong Kong
- QuantumFabless Limited , Sha Tin , Hong Kong
| | - GuanHua Chen
- Department of Chemistry , The University of Hong Kong , Pofkulam Road , Hong Kong
| | - Shaul Mukamel
- Department of Chemistry and Physics and Astronomy , University of California , Irvine , California 92617 , United States
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12
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Wells D, Quiney H. A fast and adaptable method for high accuracy integration of the time-dependent Schrödinger equation. Sci Rep 2019; 9:782. [PMID: 30692569 PMCID: PMC6349856 DOI: 10.1038/s41598-018-37382-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 11/27/2018] [Indexed: 11/15/2022] Open
Abstract
We present an adaptable, fast, and robust method for integrating the time-dependent Schrödinger equation. We apply the method to calculations of High Harmonic (HHG) and Above Threshold Ionisation (ATI) spectra for a single atomic electron in an intense laser field. Our approach implements the stabilized bi-conjugate gradient method (BiCG-STAB) for solving a sparse linear system to evolve the electronic wavefunction in time. The use of this established method makes the propagation scheme less restrictive compared to other schemes which may have particular requirements for the form of the equation, such as use of a three-point finite-difference approximation for spatial derivatives. Our method produces converged solutions significantly faster than existing methods, particularly if high accuracy is required. We demonstrate that this approach is suitable for a range of different parameters and show that in many circumstances significant gains can be made with the use of a fourth-order time propagator as opposed to the more common second-order Crank-Nicolson (CN) method.
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Affiliation(s)
- Daniel Wells
- ARC Centre of Excellence for Advanced Molecular Imaging, Theoretical Condensed Matter Physics Group, School of Physics, University of Melbourne, Victoria, 3010, Australia.
| | - Harry Quiney
- ARC Centre of Excellence for Advanced Molecular Imaging, Theoretical Condensed Matter Physics Group, School of Physics, University of Melbourne, Victoria, 3010, Australia
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13
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Monfared M, Irani E, Sadighi-Bonabi R. Controlling the multi-electron dynamics in the high harmonic spectrum from N 2O molecule using TDDFT. J Chem Phys 2018; 148:234303. [PMID: 29935508 DOI: 10.1063/1.5025155] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
In this study, high harmonic generation from a multi-atomic nitrous oxide molecule was investigated. A comprehensive three-dimensional calculation of the molecular dynamics and electron trajectories through an accurate time-dependent density functional theory was conducted to efficiently explore a broad harmonic plateau. The effects of multi-electron and inner orbitals on the harmonic spectrum and generated coherent attosecond pulses were analyzed. The role of the valence electrons in controlling the process and extending the harmonic plateau was investigated. The main issue of producing a super-continuum harmonic spectrum via a frequency shift was considered. The time-frequency representation by means of a wavelet transform of the induced dipole acceleration provided a good insight into the distorted effects from the nonlinear processes in high harmonic emission. The effect of the chirped laser pulse on the production of broadband amplitude was justified in this model. By adjusting the optimal laser parameters to an input intensity of 2.5 × 1014 W cm-2, an isolated 68 as pulse was generated.
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Affiliation(s)
- M Monfared
- Department of Physics, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran
| | - E Irani
- Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - R Sadighi-Bonabi
- Department of Physics, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran
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14
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Mineo H, Fujimura Y. Quantum control of coherent π-electron ring currents in polycyclic aromatic hydrocarbons. J Chem Phys 2017; 147:224301. [PMID: 29246044 DOI: 10.1063/1.5004504] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present results for quantum optimal control (QOC) of the coherent π electron ring currents in polycyclic aromatic hydrocarbons (PAHs). Since PAHs consist of a number of condensed benzene rings, in principle, there exist various coherent ring patterns. These include the ring current localized to a designated benzene ring, the perimeter ring current that flows along the edge of the PAH, and the middle ring current of PAHs having an odd number of benzene rings such as anthracene. In the present QOC treatment, the best target wavefunction for generation of the ring current through a designated path is determined by a Lagrange multiplier method. The target function is integrated into the ordinary QOC theory. To demonstrate the applicability of the QOC procedure, we took naphthalene and anthracene as the simplest examples of linear PAHs. The mechanisms of ring current generation were clarified by analyzing the temporal evolutions of the electronic excited states after coherent excitation by UV pulses or (UV+IR) pulses as well as those of electric fields of the optimal laser pulses. Time-dependent simulations of the perimeter ring current and middle ring current of anthracene, which are induced by analytical electric fields of UV pulsed lasers, were performed to reproduce the QOC results.
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Affiliation(s)
- Hirobumi Mineo
- Atomic Molecular and Optical Physics Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Yuichi Fujimura
- Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao-Tung University, Hsinchu 30010, Taiwan
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15
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Yuan KJ, Chelkowski S, Bandrauk AD. Ultrafast molecular photoionization by two-color orthogonally polarized ultraviolet laser pulses: Effects of relative pulse phases. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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16
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Shu CC, Dong D, Yuan KJ. Single-laser-induced quantum interference in photofragmentation reaction of D + 2. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1297861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Chuan-Cun Shu
- School of Engineering and Information Technology, University of New South Wales , Canberra, ACT, Australia
| | - Daoyi Dong
- School of Engineering and Information Technology, University of New South Wales , Canberra, ACT, Australia
| | - Kai-Jun Yuan
- School of Engineering and Information Technology, University of New South Wales , Canberra, ACT, Australia
- Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke , Sherbrooke, Canada
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17
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Molecular photoelectron interference effects by intense circularly polarized attosecond x-ray pulses. Struct Chem 2017. [DOI: 10.1007/s11224-017-0964-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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18
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Bodi A, Hemberger P, Tuckett RP. Coincident velocity map image reconstruction illustrated by the single-photon valence photoionisation of CF3SF5. Phys Chem Chem Phys 2017; 19:30173-30180. [DOI: 10.1039/c7cp05576e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoion–photoelectron kinetic energy and angular anisotropy correlation maps reveal new details about the ionization mechanism.
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Affiliation(s)
- Andras Bodi
- Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institute
- Villigen 5232
- Switzerland
| | - Patrick Hemberger
- Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institute
- Villigen 5232
- Switzerland
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19
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Hochlaf M. Advances in spectroscopy and dynamics of small and medium sized molecules and clusters. Phys Chem Chem Phys 2017; 19:21236-21261. [DOI: 10.1039/c7cp01980g] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Investigations of the spectroscopy and dynamics of small- and medium-sized molecules and clusters represent a hot topic in atmospheric chemistry, biology, physics, atto- and femto-chemistry and astrophysics.
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Affiliation(s)
- Majdi Hochlaf
- Université Paris-Est
- Laboratoire Modélisation et Simulation Multi Echelle
- MSME UMR 8208 CNRS
- 77454 Marne-la-Vallée
- France
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20
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Yuan KJ, Bandrauk AD. Exploring coherent electron excitation and migration dynamics by electron diffraction with ultrashort X-ray pulses. Phys Chem Chem Phys 2017; 19:25846-25852. [DOI: 10.1039/c7cp05067d] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Exploring ultrafast charge migration is of great importance in biological and chemical reactions.
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Affiliation(s)
- Kai-Jun Yuan
- Laboratoire de Chimie Théorique
- Faculté des Sciences
- Université de Sherbrooke
- Sherbrooke
- Canada
| | - André D. Bandrauk
- Laboratoire de Chimie Théorique
- Faculté des Sciences
- Université de Sherbrooke
- Sherbrooke
- Canada
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21
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Yuan KJ, Bandrauk AD. Monitoring coherent electron wave packet excitation dynamics by two-color attosecond laser pulses. J Chem Phys 2016; 145:194304. [DOI: 10.1063/1.4968230] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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22
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Suzuki Y, Abedi A, Maitra NT, Gross EKU. Laser-induced electron localization in H₂⁺: mixed quantum-classical dynamics based on the exact time-dependent potential energy surface. Phys Chem Chem Phys 2015; 17:29271-29280. [PMID: 26467353 DOI: 10.1039/c5cp03418c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
We study the exact nuclear time-dependent potential energy surface (TDPES) for laser-induced electron localization with a view to eventually developing a mixed quantum-classical dynamics method for strong-field processes. The TDPES is defined within the framework of the exact factorization [A. Abedi, N. T. Maitra, and E. K. U. Gross, Phys. Rev. Lett., 2010, 105, 123002] and contains the exact effect of the couplings to the electronic subsystem and to any external fields within a scalar potential. We compare its features with those of the quasistatic potential energy surfaces (QSPES) often used to analyse strong-field processes. We show that the gauge-independent component of the TDPES has a mean-field-like character very close to the density-weighted average of the QSPESs. Oscillations in this component are smoothened out by the gauge-dependent component, and both components are needed to yield the correct force on the nuclei. Once the localization begins to set in, the gradient of the exact TDPES tracks one QSPES and then switches to the other, similar to the description provided by surface-hopping between QSPESs. We show that evolving an ensemble of classical nuclear trajectories on the exact TDPES accurately reproduces the exact dynamics. This study suggests that the mixed quantum-classical dynamics scheme based on evolving multiple classical nuclear trajectories on the exact TDPES will be a novel and useful method to simulate strong field processes.
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Affiliation(s)
- Yasumitsu Suzuki
- Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - Ali Abedi
- Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
- Department of Physics and Astronomy, Hunter College and the City University of New York, 695 Park Avenue, New York, New York 10065, USA
| | - Neepa T Maitra
- Department of Physics and Astronomy, Hunter College and the City University of New York, 695 Park Avenue, New York, New York 10065, USA
| | - E K U Gross
- Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
- European Theoretical Spectroscopy Facility (ETSF)
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23
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Oliveira MJT, Mignolet B, Kus T, Papadopoulos TA, Remacle F, Verstraete MJ. Computational Benchmarking for Ultrafast Electron Dynamics: Wave Function Methods vs Density Functional Theory. J Chem Theory Comput 2015; 11:2221-33. [DOI: 10.1021/acs.jctc.5b00167] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Micael J. T. Oliveira
- Department
of Physics, University of Liège, European Theoretical Spectroscopy Facility, B-4000, Liège, Belgium
| | - Benoit Mignolet
- Department
of Chemistry, University of Liège, B-4000, Liège, Belgium
| | - Tomasz Kus
- Department
of Chemistry, University of Liège, B-4000, Liège, Belgium
| | - Theodoros A. Papadopoulos
- Department
of Natural Sciences, University of Chester, Thornton Science Park, CH2 4NU, Chester, U. K
| | - F. Remacle
- Department
of Chemistry, University of Liège, B-4000, Liège, Belgium
| | - Matthieu J. Verstraete
- Department
of Physics, University of Liège, European Theoretical Spectroscopy Facility, B-4000, Liège, Belgium
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24
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Yuan KJ, Chelkowski S, Bandrauk AD. Molecular photoelectron angular distribution rotations in multi-photon resonant ionization of H2+ by circularly polarized ultraviolet laser pulses. J Chem Phys 2015; 142:144304. [DOI: 10.1063/1.4917419] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Kai-Jun Yuan
- Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - Szczepan Chelkowski
- Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - André D. Bandrauk
- Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
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25
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Ayuso D, Kimura M, Kooser K, Patanen M, Plésiat E, Argenti L, Mondal S, Travnikova O, Sakai K, Palacios A, Kukk E, Decleva P, Ueda K, Martín F, Miron C. Vibrationally Resolved B 1s Photoionization Cross Section of BF3. J Phys Chem A 2015; 119:5971-8. [DOI: 10.1021/jp511416h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Ayuso
- Departamento de
Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - M. Kimura
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - K. Kooser
- Department
of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - M. Patanen
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin,
BP 48, 91192 Gif-sur-Yvette
Cedex, France
| | - E. Plésiat
- Departamento de
Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - L. Argenti
- Departamento de
Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - S. Mondal
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - O. Travnikova
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin,
BP 48, 91192 Gif-sur-Yvette
Cedex, France
| | - K. Sakai
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - A. Palacios
- Departamento de
Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - E. Kukk
- Department
of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - P. Decleva
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste and CNR–Istituto Officina dei Materiali, 34127 Trieste, Italy
| | - K. Ueda
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - F. Martín
- Departamento de
Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049 Madrid, Spain
- Condensed Matter Physics
Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - C. Miron
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin,
BP 48, 91192 Gif-sur-Yvette
Cedex, France
- Extreme Light Infrastructure
- Nuclear Physics (ELI-NP), “Horia Hulubei” National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125 Măgurele, Jud.
Ilfov, Romania
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