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Wang F, Xiong Z, Zhang X, Liao Q, Lu P. Attosecond photoemission delay in the inhomogeneous field. OPTICS EXPRESS 2021; 29:39729-39737. [PMID: 34809330 DOI: 10.1364/oe.441986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 10/29/2021] [Indexed: 06/13/2023]
Abstract
We investigate the photoemission process of the hydrogen atom in a spatial-dependent infrared (IR) field. The results show that the inhomogeneous field induces an additional contribution to the photoemission time delay, which results in the increase (decrease) of the photoemission time delay due to the enhancement (decay) of the IR field intensity in space when compared to the case in the homogeneous field. Based on the photoemission time delay in the inhomogeneous field, we demonstrate a method to extract the inhomogeneous parameter that is vital for characterizing the spatial distribution of IR field. The proposed method might pave an accessible route toward describing the plasmon-enhanced fields in the vicinity of a nanostructure.
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Guo L, Jia Y, Liu M, Jia X, Hu S, Lu R, Han S, Chen J. Temporal characterization of electron dynamics in attosecond XUV and infrared laser fields. OPTICS EXPRESS 2021; 29:27460-27471. [PMID: 34615161 DOI: 10.1364/oe.432881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
We use a Wigner distribution-like function based on the strong field approximation theory to obtain the time-energy distributions and the ionization time distributions of electrons ionized by an XUV pulse alone and in the presence of an infrared (IR) pulse. In the case of a single XUV pulse, although the overall shape of the ionization time distribution resembles the XUV-envelope, its detail shows dependence on the emission direction of the electron and the carrier-envelope phase of the pulse, which mainly results from the low-energy interference structure. It is further found that the electron from the counter-rotating term plays an important role in the interference. In the case of the two-color pulse, both the time-energy distributions and the ionization time distributions change with varying IR field. Our analysis demonstrates that the IR field not only modifies the final electron kinetic energy but also changes the electron's emission time, which is attributed to the change of the electric field induced by the IR pulse. Moreover, the ionization time distributions of the photoelectrons emitted from atoms with higher ionization energy are also given, which show less impact of the IR field on the electron dynamics.
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Liang J, Zhou Y, Tan J, He M, Ke Q, Zhao Y, Li M, Jiang W, Lu P. Low-energy photoelectron interference structure in attosecond streaking. OPTICS EXPRESS 2019; 27:37736-37752. [PMID: 31878550 DOI: 10.1364/oe.27.037736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
By numerically solving the time-dependent Schrödinger equation, we theoretically investigate the dynamics of the low-energy photoelectrons ionized by a single attosecond pulse in the presence of an infrared laser field. The obtained photoelectron momentum distributions exhibit complicated interference structures. With the semiclassical model, the originations for the different types of the interference structures are unambiguously identified. Moreover, by changing the time delay between the attosecond pulse and the infrared laser field, these interferences could be selectively enhanced or suppressed. This enables us to extract information about the ionization dynamics encoded in the interference structures. As an example, we show that the phase of the electron wave-packets ionized by the linearly and circularly polarized attosecond pulses can be extracted from the interference structures of the direct and the near-forward rescattering electrons.
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Chacón A, Ruiz C. Attosecond delay in the molecular photoionization of asymmetric molecules. OPTICS EXPRESS 2018; 26:4548-4562. [PMID: 29475304 DOI: 10.1364/oe.26.004548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 12/15/2017] [Indexed: 06/08/2023]
Abstract
We report theoretical calculations of the delay in photoemission from CO with particular emphasis on the role of the ultrafast electronic bound dynamics. We study the delays in photoionization in the HOMO and HOMO-1 orbitals of the CO molecule by looking into the stereo Wigner time delay technique. That compares the delay in photoemission from electrons emitted to the left and right to extract structural and dynamical information of the ionization process. For this we apply two techniques: The attosecond streak camera and the time of flight technique. Although they should provide the same results we have found large discrepancies of up to 36 in the case of HOMO, while for the HOMO-1 we obtain the same results with the two techniques. We have found that the large time delays observed in the HOMO orbital with the streaking technique are a consequence of the resonant transition triggered by the streaking field. This resonant transition produces a bound electron wavepacket that modifies the measurements of delay in photoionization. As a result of this observation, our technique allows us to reconstruct the bound wavepacket dynamics induced by the streaking field. By measuring the expected value of the electron momentum along the polarization direction after the streaking field has finished, we can recover the relative phase between the complex amplitudes of the HOMO and LUMO orbitals. These theoretical calculations pave the way for the measurement of ultrafast bound-bound electron transitionsand its crucial role for the delay in photoemission observation.
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Ramasesha K, Leone SR, Neumark DM. Real-Time Probing of Electron Dynamics Using Attosecond Time-Resolved Spectroscopy. Annu Rev Phys Chem 2016; 67:41-63. [DOI: 10.1146/annurev-physchem-040215-112025] [Citation(s) in RCA: 136] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Krupa Ramasesha
- Department of Chemistry, University of California, Berkeley, California 94720;
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550
| | - Stephen R. Leone
- Department of Chemistry, University of California, Berkeley, California 94720;
- Department of Physics, University of California, Berkeley, California 94720
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Daniel M. Neumark
- Department of Chemistry, University of California, Berkeley, California 94720;
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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Nagele S, Pazourek R, Wais M, Wachter G, Burgdörfer J. Time-resolved photoemission using attosecond streaking. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/488/1/012004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pazourek R, Nagele S, Burgdörfer J. Time-resolved photoemission on the attosecond scale: opportunities and challenges. Faraday Discuss 2013; 163:353-76; discussion 393-432. [PMID: 24020211 DOI: 10.1039/c3fd00004d] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction of laser pulses of sub-femtosecond duration with matter opened up the opportunity to explore electronic processes on their natural time scale. One central conceptual question posed by the observation of photoemission in real time is whether the ejection of the photoelectron wavepacket occurs instantaneously, or whether the response time to photoabsorption is finite leading to a time delay in photoemission. Recent experimental progress exploring attosecond streaking and RABBIT techniques find relative time delays between the photoemission from different atomic substates to be of the order of -20 attoseconds. We present ab initio simulations for both one- and two-electron systems which allow the determination of both absolute and relative time delays with -1 attosecond precision. We show that the intrinsic time shift of the photoionization process encoded in the Eisenbud-Wigner-Smith delay time can be unambiguously disentangled from measurement-induced time delays in a pump-probe setting when the photoionized electronic wavepacket is probed by a modestly strong infrared streaking field. We identify distinct contributions due to initial-state polarization, Coulomb-laser coupling in the final continuum state as well as final-state interaction with the entangled residual ionic state. Extensions to multi-electron systems and to the extraction of time information in the presence of decohering processes are discussed.
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Affiliation(s)
- Renate Pazourek
- Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria.
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Klaiber M, Yakaboylu E, Bauke H, Hatsagortsyan KZ, Keitel CH. Under-the-barrier dynamics in laser-induced relativistic tunneling. PHYSICAL REVIEW LETTERS 2013; 110:153004. [PMID: 25167261 DOI: 10.1103/physrevlett.110.153004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Indexed: 06/03/2023]
Abstract
The tunneling dynamics in relativistic strong-field ionization is investigated with the aim to develop an intuitive picture for the relativistic tunneling regime. We demonstrate that the tunneling picture applies also in the relativistic regime by introducing position dependent energy levels. The quantum dynamics in the classically forbidden region features two time scales, the typical time that characterizes the probability density's decay of the ionizing electron under the barrier (Keldysh time) and the time interval which the electron spends inside the barrier (Eisenbud-Wigner-Smith tunneling time). In the relativistic regime, an electron momentum shift as well as a spatial shift along the laser propagation direction arise during the under-the-barrier motion which are caused by the laser magnetic field induced Lorentz force. The momentum shift is proportional to the Keldysh time, while the wave-packet's spatial drift is proportional to the Eisenbud-Wigner-Smith time. The signature of the momentum shift is shown to be present in the ionization spectrum at the detector and, therefore, observable experimentally. In contrast, the signature of the Eisenbud-Wigner-Smith time delay disappears at far distances for pure quasistatic tunneling dynamics.
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Affiliation(s)
- Michael Klaiber
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Enderalp Yakaboylu
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Heiko Bauke
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | | | - Christoph H Keitel
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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Pfeiffer AN, Cirelli C, Smolarski M, Keller U. Recent attoclock measurements of strong field ionization. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2012.02.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- Lukas Gallmann
- Physics Department, Eidgenössische Technische Hochschule Zürich, CH-8093 Zurich, Switzerland;
| | - Claudio Cirelli
- Physics Department, Eidgenössische Technische Hochschule Zürich, CH-8093 Zurich, Switzerland;
| | - Ursula Keller
- Physics Department, Eidgenössische Technische Hochschule Zürich, CH-8093 Zurich, Switzerland;
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Pazourek R, Feist J, Nagele S, Burgdörfer J. Attosecond streaking of correlated two-electron transitions in helium. PHYSICAL REVIEW LETTERS 2012; 108:163001. [PMID: 22680715 DOI: 10.1103/physrevlett.108.163001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Indexed: 06/01/2023]
Abstract
We present fully ab initio simulations of attosecond streaking for ionization of helium accompanied by shakeup of the second electron. This process represents a prototypical case for strongly correlated electron dynamics on the attosecond time scale. We show that streaking spectroscopy can provide detailed information on the Eisenbud-Wigner-Smith time delay as well as on the infrared-field dressing of both bound and continuum states. We find a novel contribution to the streaking delay that stems from the interplay of electron-electron and infrared-field interactions in the exit channel. We quantify all the contributions with attosecond precision and provide a benchmark for future experiments.
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Affiliation(s)
- Renate Pazourek
- Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria, EU.
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Klünder K, Dahlström JM, Gisselbrecht M, Fordell T, Swoboda M, Guénot D, Johnsson P, Caillat J, Mauritsson J, Maquet A, Taïeb R, L'Huillier A. Probing single-photon ionization on the attosecond time scale. PHYSICAL REVIEW LETTERS 2011; 106:143002. [PMID: 21561188 DOI: 10.1103/physrevlett.106.143002] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Indexed: 05/30/2023]
Abstract
We study photoionization of argon atoms excited by attosecond pulses using an interferometric measurement technique. We measure the difference in time delays between electrons emitted from the 3s(2) and from the 3p(6) shell, at different excitation energies ranging from 32 to 42 eV. The determination of photoemission time delays requires taking into account the measurement process, involving the interaction with a probing infrared field. This contribution can be estimated using a universal formula and is found to account for a substantial fraction of the measured delay.
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Affiliation(s)
- K Klünder
- Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden
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Schultze M, Fiess M, Karpowicz N, Gagnon J, Korbman M, Hofstetter M, Neppl S, Cavalieri AL, Komninos Y, Mercouris T, Nicolaides CA, Pazourek R, Nagele S, Feist J, Burgdorfer J, Azzeer AM, Ernstorfer R, Kienberger R, Kleineberg U, Goulielmakis E, Krausz F, Yakovlev VS. Delay in Photoemission. Science 2010; 328:1658-62. [DOI: 10.1126/science.1189401] [Citation(s) in RCA: 772] [Impact Index Per Article: 55.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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