1
|
Brennecke S, Ranke M, Dimitriou A, Walther S, Prandolini MJ, Lein M, Frühling U. Control of Electron Wave Packets Close to the Continuum Threshold Using Near-Single-Cycle THz Waveforms. PHYSICAL REVIEW LETTERS 2022; 129:213202. [PMID: 36461977 DOI: 10.1103/physrevlett.129.213202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 10/17/2022] [Indexed: 06/17/2023]
Abstract
The control of low-energy electrons by carrier-envelope-phase-stable near-single-cycle THz pulses is demonstrated. A femtosecond laser pulse is used to create a temporally localized wave packet through multiphoton absorption at a well defined phase of a synchronized THz field. By recording the photoelectron momentum distributions as a function of the time delay, we observe signatures of various regimes of dynamics, ranging from recollision-free acceleration to coherent electron-ion scattering induced by the THz field. The measurements are confirmed by three-dimensional time-dependent Schrödinger equation simulations. A classical trajectory model allows us to identify scattering phenomena analogous to strong-field photoelectron holography and high-order above-threshold ionization.
Collapse
Affiliation(s)
- Simon Brennecke
- Leibniz Universität Hannover, Institut für Theoretische Physik, Appelstraße 2, 30167 Hannover, Germany
| | - Martin Ranke
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Anastasios Dimitriou
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
- Institute of Nanoscience and Nanotechnology, NSR Demokritos, 15341 Agia Paraskevi, Athens, Greece
| | - Sophie Walther
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Mark J Prandolini
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Manfred Lein
- Leibniz Universität Hannover, Institut für Theoretische Physik, Appelstraße 2, 30167 Hannover, Germany
| | - Ulrike Frühling
- Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22603 Hamburg, Germany
| |
Collapse
|
2
|
Huang X, Zhang Q, Xu S, Fu X, Han X, Cao W, Lu P. Coulomb focusing in retrapped ionization with near-circularly polarized laser field. OPTICS EXPRESS 2019; 27:38116-38124. [PMID: 31878583 DOI: 10.1364/oe.27.038116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 11/28/2019] [Indexed: 06/10/2023]
Abstract
The full three-dimensional photoelectron momentum distributions of argon are measured in intense near-circularly polarized laser fields. We observed that the transverse momentum distribution of ejected electrons by 410-nm near-circularly polarized field is unexpectedly narrowed with increasing laser intensity, which is contrary to the conventional rules predicted by adiabatic theory. By analyzing the momentum-resolved angular momentum distribution measured experimentally and the corresponding trajectories of ejected electrons semiclassically, the narrowing can be attributed to a temporary trapping and thereby focusing of a photoelectron by the atomic potential in a quasibound state. With the near-circularly polarized laser field, the strong Coulomb interaction with the rescattering electrons is avoided, thus the Coulomb focusing in the retrapped process is highlighted. We believe that these findings will facilitate understanding and steering electron dynamics in the Coulomb coupled system.
Collapse
|
3
|
Quan W, Hao X, Chen Y, Yu S, Xu S, Wang Y, Sun R, Lai X, Wu C, Gong Q, He X, Liu X, Chen J. Long-Range Coulomb Effect in Intense Laser-Driven Photoelectron Dynamics. Sci Rep 2016; 6:27108. [PMID: 27256904 PMCID: PMC4891819 DOI: 10.1038/srep27108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 05/12/2016] [Indexed: 11/21/2022] Open
Abstract
In strong field atomic physics community, long-range Coulomb interaction has for a long time been overlooked and its significant role in intense laser-driven photoelectron dynamics eluded experimental observations. Here we report an experimental investigation of the effect of long-range Coulomb potential on the dynamics of near-zero-momentum photoelectrons produced in photo-ionization process of noble gas atoms in intense midinfrared laser pulses. By exploring the dependence of photoelectron distributions near zero momentum on laser intensity and wavelength, we unambiguously demonstrate that the long-range tail of the Coulomb potential (i.e., up to several hundreds atomic units) plays an important role in determining the photoelectron dynamics after the pulse ends.
Collapse
Affiliation(s)
- Wei Quan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - XiaoLei Hao
- Institute of Theoretical Physics and Department of Physics, Shanxi University, 030006 Taiyuan, China
| | - YongJu Chen
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physics, University of Chinese Academy of Sciences, Beijing 100080, China
| | - ShaoGang Yu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physics, University of Chinese Academy of Sciences, Beijing 100080, China
| | - SongPo Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physics, University of Chinese Academy of Sciences, Beijing 100080, China
| | - YanLan Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physics, University of Chinese Academy of Sciences, Beijing 100080, China
| | - RenPing Sun
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physics, University of Chinese Academy of Sciences, Beijing 100080, China
| | - XuanYang Lai
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - ChengYin Wu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.,Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - QiHuang Gong
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.,Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - XianTu He
- HEDPS, Center for Applied Physics and Technology, Collaborative Innovation Center of IFSA, Peking University, Beijing 100084, China.,Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China
| | - XiaoJun Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jing Chen
- HEDPS, Center for Applied Physics and Technology, Collaborative Innovation Center of IFSA, Peking University, Beijing 100084, China.,Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China
| |
Collapse
|
4
|
Guo L, Han SS, Liu X, Cheng Y, Xu ZZ, Fan J, Chen J, Chen SG, Becker W, Blaga CI, DiChiara AD, Sistrunk E, Agostini P, DiMauro LF. Scaling of the low-energy structure in above-threshold ionization in the tunneling regime: theory and experiment. PHYSICAL REVIEW LETTERS 2013; 110:013001. [PMID: 23383786 DOI: 10.1103/physrevlett.110.013001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Indexed: 06/01/2023]
Abstract
A calculation of the second-order (rescattering) term in the S-matrix expansion of above-threshold ionization is presented for the case when the binding potential is the unscreened Coulomb potential. Technical problems related to the divergence of the Coulomb scattering amplitude are avoided in the theory by considering the depletion of the atomic ground state due to the applied laser field, which is well defined and does not require the introduction of a screening constant. We focus on the low-energy structure, which was observed in recent experiments with a midinfrared wavelength laser field. Both the spectra and, in particular, the observed scaling versus the Keldysh parameter and the ponderomotive energy are reproduced. The theory provides evidence that the origin of the structure lies in the long-range Coulomb interaction.
Collapse
Affiliation(s)
- L Guo
- Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
|
6
|
Jiang TF, Jheng SD, Lee YM, Su ZY. Lande subtraction method with finite integration limits and application to strong-field problems. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:066702. [PMID: 23368073 DOI: 10.1103/physreve.86.066702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2012] [Revised: 10/02/2012] [Indexed: 06/01/2023]
Abstract
The Lande subtraction method has been widely used in Coulomb problems, but the momentum coordinate p∈(0,∞) is assumed. In past applications, a very large range of p was used for accuracy. We derive the supplementary formulation with p∈(0,p_{max}) at reasonably small p_{max} for practical calculations. With the recipe, accuracy of the hydrogenic eigenspectrum is dramatically improved compared to the ordinary Lande formula by the same momentum grids. We apply the present formulation to strong-field atomic above-threshold ionization and high-order harmonic generations. We demonstrate that the proposed momentum space method can be another practical theoretical tool for atomic strong-field problems in addition to the existing methods.
Collapse
Affiliation(s)
- Tsin-Fu Jiang
- Institute of Physics, National Chiao-Tung University, Hsinchu 30010, Taiwan.
| | | | | | | |
Collapse
|
7
|
Wu CY, Yang YD, Liu YQ, Gong QH, Wu M, Liu X, Hao XL, Li WD, He XT, Chen J. Characteristic spectrum of very low-energy photoelectron from above-threshold ionization in the tunneling regime. PHYSICAL REVIEW LETTERS 2012; 109:043001. [PMID: 23006081 DOI: 10.1103/physrevlett.109.043001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 01/13/2012] [Indexed: 06/01/2023]
Abstract
We report an experimental and theoretical study of very low-energy photoelectrons in tunneling ionization process from noble gas atoms interacting with ultrashort intense infrared laser pulses. A universal peak structure with electron energy well below 1 eV in the photoelectron spectrum, corresponding to the double-hump structure in the longitudinal momentum distribution, is identified experimentally for all atomic species. Our quantum and semiclassical analysis reveal the role of long-range Coulomb potential in the production of this very low-energy peak structure.
Collapse
Affiliation(s)
- C Y Wu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Lötstedt E, Kato T, Yamanouchi K. Classical dynamics of laser-driven D₃⁺. PHYSICAL REVIEW LETTERS 2011; 106:203001. [PMID: 21668225 DOI: 10.1103/physrevlett.106.203001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Indexed: 05/30/2023]
Abstract
A classical model of the triatomic D₃⁺ molecule subjected to an intense, few-cycle laser pulse is introduced. The model is capable of describing the laser-induced correlated motion of both electrons and nuclei in three dimensions, and allows us to follow the motion of the two electrons and three deuterons from the initial field-free state, during the pulse, and until the bond breaking into the final fragments. By averaging over many trajectories, we calculate the relative yields of the ionization and dissociation channels, as well as the kinetic energy release (KER) from the fragment ions. A comparison with recent experimental KER spectra shows good qualitative agreement. In addition, we find a pathway in which an emitted electron recombines into a high-lying Rydberg state, resulting in D + D⁺ + D⁺ fragments with the same KER as in the D⁺ + D⁺ + D⁺ channel.
Collapse
Affiliation(s)
- Erik Lötstedt
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| | | | | |
Collapse
|
9
|
Liu C, Hatsagortsyan KZ. Origin of unexpected low energy structure in photoelectron spectra induced by midinfrared strong laser fields. PHYSICAL REVIEW LETTERS 2010; 105:113003. [PMID: 20867569 DOI: 10.1103/physrevlett.105.113003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Indexed: 05/29/2023]
Abstract
Using a semiclassical model which incorporates tunneling and Coulomb field effects, the origin of the low-energy structure (LES) in the above-threshold ionization spectrum observed in recent experiments [Blaga, Nature Phys. 5, 335 (2009); Quan, Phys. Rev. Lett. 103, 093001 (2009).] is identified. We show that the LES arises due to an interplay between multiple forward scattering of an ionized electron and the electron momentum disturbance by the Coulomb field immediately after the ionization. The multiple forward scattering is mainly responsible for the appearance of LES, while the initial disturbance mainly determines the position of the LES peaks. The scaling laws for the LES parameters, such as the contrast ratio and the maximal energy, versus the laser intensity and wavelength are deduced.
Collapse
Affiliation(s)
- Chengpu Liu
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
| | | |
Collapse
|
10
|
Huang C, Liao Q, Zhou Y, Lu P. Role of Coulomb focusing on the electron transverse momentum of Above-Threshold Ionization. OPTICS EXPRESS 2010; 18:14293-14300. [PMID: 20588564 DOI: 10.1364/oe.18.014293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have investigated the 2D photoelectron momentum spectra for ATI of atoms exposed to linearly polarized pulses by quantum mechanical calculations. By comparing the 2D momentum spectra for the long-range and short-range Coulomb potentials, the focusing of the electron transverse momentum by the long-range interaction is clearly revealed. Analysis indicates that the Coulomb attraction of the parent core to the returning electron is responsible for the focusing of the electron transverse momentum. Moreover, the strong dependence of the focusing of the electron transverse momentum on the laser wavelength and intensity is discussed.
Collapse
Affiliation(s)
- Cheng Huang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
| | | | | | | |
Collapse
|
11
|
Quan W, Lin Z, Wu M, Kang H, Liu H, Liu X, Chen J, Liu J, He XT, Chen SG, Xiong H, Guo L, Xu H, Fu Y, Cheng Y, Xu ZZ. Classical aspects in above-threshold ionization with a midinfrared strong laser field. PHYSICAL REVIEW LETTERS 2009; 103:093001. [PMID: 19792794 DOI: 10.1103/physrevlett.103.093001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 03/26/2009] [Indexed: 05/28/2023]
Abstract
We present high resolution photoelectron energy spectra of noble gas atoms from high intensity above-threshold ionization (ATI) at midinfrared wavelengths. An unexpected structure at the very low-energy portion of the spectra, in striking contrast to the prediction of the simple-man theory, has been revealed. A semiclassical model calculation is able to reproduce the experimental feature and suggests the prominent role of the Coulomb interaction of the outgoing electron with the parent ion in producing the peculiar structure in long wavelength ATI spectra.
Collapse
Affiliation(s)
- W Quan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Arbó DG, Yoshida S, Persson E, Dimitriou KI, Burgdörfer J. Interference oscillations in the angular distribution of laser-ionized electrons near ionization threshold. PHYSICAL REVIEW LETTERS 2006; 96:143003. [PMID: 16712069 DOI: 10.1103/physrevlett.96.143003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2005] [Indexed: 05/09/2023]
Abstract
We analyze the two-dimensional momentum distribution of electrons ionized by few-cycle laser pulses in the transition regime from multiphoton absorption to tunneling by solving the time-dependent Schrödinger equation and by a classical-trajectory Monte-Carlo simulation with tunneling (CTMC-T). We find a complex two-dimensional interference pattern that resembles above threshold ionization (ATI) rings at higher energies and displays Ramsauer-Townsend-type diffraction oscillations in the angular distribution near threshold. CTMC-T calculations provide a semiclassical explanation for the dominance of selected partial waves. While the present calculation pertains to hydrogen, we find surprising qualitative agreement with recent experimental data for rare gases [A. Rudenko, J. Phys. B 37, L407 (2004)].
Collapse
Affiliation(s)
- D G Arbó
- Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/136, A-1040 Vienna, Austria, EU.
| | | | | | | | | |
Collapse
|