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Motta M, Rice JE. Emerging quantum computing algorithms for quantum chemistry. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2022. [DOI: 10.1002/wcms.1580] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mario Motta
- IBM Quantum, IBM Research‐Almaden San Jose California USA
| | - Julia E. Rice
- IBM Quantum, IBM Research‐Almaden San Jose California USA
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2
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Kümmel T, Teumer T, Dörnhofer P, Methner FJ, Wängler B, Rädle M. Contrast enhancement of surface layers with fast middle-infrared scanning. Heliyon 2019; 5:e02442. [PMID: 31528751 PMCID: PMC6742858 DOI: 10.1016/j.heliyon.2019.e02442] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/19/2019] [Accepted: 09/04/2019] [Indexed: 11/16/2022] Open
Abstract
In this study, we present an efficient and innovative method to visualize absorption differences in the mid-infrared range with spatial resolution using laser technology. We focus on only two lasers with wavelengths between 3.4 μm and 3.6 μm and a spatial resolution of 20 μm and thus achieve a scanning speed up to 300 kS/s for fast image generation. In this article, we focus especially on the detection of C–H bands in this region of the absorption spectrum. Concealed structures are examined by calculating the measured structures with both wavelengths. In our results, we demonstrate exemplary measurements on 130-μm-thick polyvinyl chloride layers. In turn, these structures are suitable for further processing in rapid quantitative quality control.
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Affiliation(s)
- Tim Kümmel
- Center for Mass Spectrometry and Optical Spectroscopy, Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, Mannheim, 68163, Germany.,University of Heidelberg, Medical Faculty Mannheim, Theodor-Kutzer-Ufer 1-3, Mannheim, 68167, Germany
| | - Tobias Teumer
- Center for Mass Spectrometry and Optical Spectroscopy, Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, Mannheim, 68163, Germany.,Institute of Food Technology and Food Chemistry, Technische Universität Berlin, Seestraße 13, Berlin, 13353, Germany
| | - Patrick Dörnhofer
- Center for Mass Spectrometry and Optical Spectroscopy, Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, Mannheim, 68163, Germany
| | - Frank-Jürgen Methner
- Institute of Food Technology and Food Chemistry, Technische Universität Berlin, Seestraße 13, Berlin, 13353, Germany
| | - Björn Wängler
- University of Heidelberg, Medical Faculty Mannheim, Theodor-Kutzer-Ufer 1-3, Mannheim, 68167, Germany
| | - Matthias Rädle
- Center for Mass Spectrometry and Optical Spectroscopy, Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, Mannheim, 68163, Germany
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3
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Dey D, Ray D, Tiwari AK. Controlling Electron Dynamics with Carrier-Envelope Phases of a Laser Pulse. J Phys Chem A 2019; 123:4702-4707. [PMID: 31074991 DOI: 10.1021/acs.jpca.9b02870] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A theoretical study on the ionization dynamics of carbon atom irradiated with a few-cycle, intense laser field is performed within a quasiclassical model to get mechanistic insights into an earlier reported carrier-envelope phase dependency of ionization probabilities of an atom [ Phys. Rev. Lett. 2013, 110, 083602]. The carrier-envelope phase of the laser pulse is found to govern the overall dynamics, reflecting its importance in controlling electronic motion. To understand the origin of this effect, individual trajectories were analyzed at a particular laser intensity. We found that a variation in the carrier-envelope phase affects the angle of ejection of the electrons and subsequently the attainment of the desired final state.
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Affiliation(s)
- Diptesh Dey
- Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
| | - Dhiman Ray
- Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
| | - Ashwani K Tiwari
- Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
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4
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Pohl V, Hermann G, Tremblay JC. An open-source framework for analyzing N
-electron dynamics. I. Multideterminantal wave functions. J Comput Chem 2017; 38:1515-1527. [DOI: 10.1002/jcc.24792] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 02/27/2017] [Accepted: 02/28/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Vincent Pohl
- Institut für Chemie und Biochemie, Freie Universität Berlin; Takustraße 3 Berlin 14195 Germany
| | - Gunter Hermann
- Institut für Chemie und Biochemie, Freie Universität Berlin; Takustraße 3 Berlin 14195 Germany
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5
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Dey D, Tiwari AK. Coupled Electron-Nuclear Dynamics on H 2+ within Time-Dependent Born-Oppenheimer Approximation. J Phys Chem A 2016; 120:8259-8266. [PMID: 27690436 DOI: 10.1021/acs.jpca.6b09004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Quantum dynamical behavior of H2+ in the presence of a linearly polarized, ultrashort, intense, infrared laser pulse has been studied by numerically solving the time-dependent Schrödinger equation with nuclear motion restricted in one-dimension along the direction of laser polarization and electronic motion in three-dimensions. On the basis of the time-dependent Born-Oppenheimer approximation, we have constructed time-dependent potentials for the ground electronic state (1sσg) of H2+. Subsequent nuclear dynamics is then carried out on these field-dressed potential energy surfaces, and the dissociation dynamics is investigated. Our analyses reveal that although the electronic longitudinal degree of freedom plays the major role in governing the dissociation dynamics, contributions from the electronic transverse degree of freedom should also have to be taken into account to obtain accurate results. Also, modeling electron-nuclei Coulomb interactions in a one-dimensional calculation with an artificially chosen constant softening parameter leads to a discrepancy with the exact results. Comparing our results with other quantum and classical dynamical studies showed a good agreement with exact results.
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Affiliation(s)
- Diptesh Dey
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Ashwani K Tiwari
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
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6
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Klinkusch S, Tremblay JC. Resolution-of-identity stochastic time-dependent configuration interaction for dissipative electron dynamics in strong fields. J Chem Phys 2016; 144:184108. [DOI: 10.1063/1.4948646] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Stefan Klinkusch
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
| | - Jean Christophe Tremblay
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
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7
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Schönborn JB, Saalfrank P, Klamroth T. Controlling the high frequency response of H2 by ultra-short tailored laser pulses: A time-dependent configuration interaction study. J Chem Phys 2016; 144:044301. [DOI: 10.1063/1.4940316] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Jan Boyke Schönborn
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany
| | - Peter Saalfrank
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany
| | - Tillmann Klamroth
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany
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8
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Zhang GP, Si MS, Bai YH, George TF. Magnetic spin moment reduction in photoexcited ferromagnets through exchange interaction quenching: beyond the rigid band approximation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:206003. [PMID: 25950828 DOI: 10.1088/0953-8984/27/20/206003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The exchange interaction among electrons is one of the most fundamental quantum mechanical interactions in nature and underlies any magnetic phenomena from ferromagnetic ordering to magnetic storage. The current technology is built upon a thermal or magnetic field, but a frontier is emerging to directly control magnetism using ultrashort laser pulses. However, little is known about the fate of the exchange interaction. Here we report unambiguously that photoexcitation is capable of quenching the exchange interaction in all three 3d ferromagnetic metals. The entire process starts with a small number of photoexcited electrons which build up a new and self-destructive potential that collapses the system into a new state with a reduced exchange splitting. The spin moment reduction follows a Bloch-like law as M(z)(ΔE) = M(z)(0)(1 - ΔE/ΔE₀)(1/β), where ΔE is the absorbed photon energy and β is a scaling exponent. A good agreement is found between the experimental and our theoretical results. Our findings may have a broader implication for dynamic electron correlation effects in laser-excited iron-based superconductors, iron borate, rare-earth orthoferrites, hematites and rare-earth transition metal alloys.
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Affiliation(s)
- G P Zhang
- Department of Physics, Indiana State University, Terre Haute, IN 47809, USA
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9
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Huber C, Klamroth T. Explicitly time-dependent coupled cluster singles doubles calculations of laser-driven many-electron dynamics. J Chem Phys 2011; 134:054113. [DOI: 10.1063/1.3530807] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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10
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Tremblay JC, Klinkusch S, Klamroth T, Saalfrank P. Dissipative many-electron dynamics of ionizing systems. J Chem Phys 2011; 134:044311. [DOI: 10.1063/1.3532410] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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11
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Nest M, Klamroth T, Saalfrank P. Ab initio Electron Dynamics with the Multi-Configuration Time-Dependent Hartree-Fock Method. ACTA ACUST UNITED AC 2010. [DOI: 10.1524/zpch.2010.6124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
This paper gives an overview of the theory and some selected applications of the Multi-Configuration Time-Dependent Hartree-Fock (MCTDHF) method. This method can be seen as an explicitly time-dependent version of the Complete Active Space Self-Consistent Field (CASSCF) method of standard quantum chemistry. Strengths and shortcomings are discussed, and some comparisons with other methods of correlated electron dynamics are given.
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12
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Paul AK, Adhikari S, Mukhopadhyay D, Halász GJ, Vibók A, Baer R, Baer M. Photodissociation of H2(+) upon exposure to an intense pulsed photonic Fock state. J Phys Chem A 2009; 113:7331-7. [PMID: 19552475 DOI: 10.1021/jp811269g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Producing and controlling nonclassical light states are now the subject of intense experimental efforts. In this paper we consider the interaction of such a light state with a small molecule. Specifically, we develop the theory and apply it numerically to calculate in detail how a short pulse of nonclassical light, such as the high intensity Fock state, induces photodissociation in H(2)(+). We compare the kinetic energy distributions and photodissociation yields with the analogous results of quasi-classical light, namely a coherent state. We find that Fock-state light decreases the overall probability of dissociation for low vibrational states of H(2)(+) as well as the location of peaks and line shapes in the kinetic energy distribution of the nuclei.
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Affiliation(s)
- Amit K Paul
- Department of Physical Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
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13
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Klamroth T, Nest M. Ultrafast electronic excitations of small sodium clusters and the onset of electron thermalization. Phys Chem Chem Phys 2009; 11:349-57. [DOI: 10.1039/b813619j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Eshuis H, Balint-Kurti GG, Manby FR. Dynamics of molecules in strong oscillating electric fields using time-dependent Hartree–Fock theory. J Chem Phys 2008; 128:114113. [DOI: 10.1063/1.2850415] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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15
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Krause P, Klamroth T, Saalfrank P. Molecular response properties from explicitly time-dependent configuration interaction methods. J Chem Phys 2007; 127:034107. [PMID: 17655431 DOI: 10.1063/1.2749503] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper we report the calculation of molecular electric response properties with the help of explicitly time-dependent configuration interaction (TD-CI) methods. These methods have the advantage of being applicable (within the limitations of the time-dependent Schrodinger equation) to time-dependent perturbations of arbitrary shape and strength. Three variants are used to solve the time-dependent electronic Schrodinger equation, namely, the TD-CIS (inclusion of single excitations only), TD-CISD (inclusion of single and double excitations), and TD-CIS(D) (single excitations and perturbative treatment of double excitations) methods and applied for illustration to small molecules, H(2) and H(2)O. In the calculation, slowly varying off-resonant electric fields are applied to the molecules and linear (polarizabilities) and nonlinear (hyperpolarizabilities, harmonic generation) response properties are determined from the time-dependent dipole moments.
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Affiliation(s)
- Pascal Krause
- Theoretische Chemie, Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany
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Baeva T, Gordienko S, Pukhov A. Theory of high-order harmonic generation in relativistic laser interaction with overdense plasma. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:046404. [PMID: 17155179 DOI: 10.1103/physreve.74.046404] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Indexed: 05/12/2023]
Abstract
High-order harmonic generation due to the interaction of a short ultrarelativistic laser pulse with overdense plasma is studied analytically and numerically. On the basis of the ultrarelativistic similarity theory we show that the high-order harmonic spectrum is universal, i.e., it does not depend on the interaction details. The spectrum includes the power-law part In proportional variantion for n(-8/3) for n < sqrt of 8 alpha gammamax3, followed by exponential decay. Here gammamax is the largest relativistic gamma factor of the plasma surface and alpha is the second derivative of the surface velocity at this moment. The high-order harmonic cutoff at proportional variantion gammamax3 is parametrically larger than the 4gammamax2 predicted by the simple "oscillating mirror" model based on the Doppler effect. The cornerstone of our theory is the new physical phenomenon: spikes in the relativistic gamma factor of the plasma surface. These spikes define the high-order harmonic spectrum and lead to attosecond pulses in the reflected radiation.
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Affiliation(s)
- T Baeva
- Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225 Dusseldorf, Germany
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17
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Martiny CPJ, Madsen LB. Symmetry of carrier-envelope phase difference effects in strong-field, few-cycle ionization of atoms and molecules. PHYSICAL REVIEW LETTERS 2006; 97:093001. [PMID: 17026358 DOI: 10.1103/physrevlett.97.093001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2006] [Indexed: 05/12/2023]
Abstract
In few-cycle pulses, the exact value of the carrier-envelope phase difference (CEPD) has a pronounced influence on the ionization dynamics of atoms and molecules. We show that, for atoms in circularly polarized light, a change in the CEPD is mapped uniquely to an overall rotation of the system, and results for arbitrary CEPD are obtained by rotation of the results from a single calculation with fixed CEPD. For molecules, this is true only for linear molecules aligned parallel with the propagation direction of the field. The effects of CEPD are classified as geometric or nongeometric. The observations are exemplified by strong-field calculations on hydrogen.
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Gordienko S, Pukhov A, Shorokhov O, Baeva T. Relativistic Doppler effect: universal spectra and zeptosecond pulses. PHYSICAL REVIEW LETTERS 2004; 93:115002. [PMID: 15447348 DOI: 10.1103/physrevlett.93.115002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2003] [Indexed: 05/24/2023]
Abstract
We report on a numerical observation of the train of zeptosecond pulses produced by the reflection of a relativistically intense femtosecond laser pulse from the oscillating boundary of an overdense plasma because of the Doppler effect. These pulses promise to become unique experimental and technological tools since their length is of the order of the Bohr radius and the intensity is extremely high proportional, variant 10(19) W/cm(2). We present the physical mechanism, analytical theory, and direct particle-in-cell simulations. We show that the harmonic spectrum is universal: the intensity of nth harmonic scales as 1/n(p) for n<4gamma(2), where gamma is the largest gamma factor of the electron fluid boundary, and p=3 and p=5/2 for the broadband and quasimonochromatic laser pulses, respectively.
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Affiliation(s)
- S Gordienko
- Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225, Germany
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Pukhov A, Gordienko S, Baeva T. Temporal structure of attosecond pulses from intense laser-atom interactions. PHYSICAL REVIEW LETTERS 2003; 91:173002. [PMID: 14611340 DOI: 10.1103/physrevlett.91.173002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2003] [Indexed: 05/24/2023]
Abstract
We find that the high harmonics have a power-law spectrum I(omega) approximately omega(-3.3+/-0.25) in a wide frequency domain starting at the ionization potential I(p) and down to the plateau beginning. Our spectrotemporal analysis of the emitted radiation displays clear bowlike structures in the (t,omega) plane. These "bows" correspond to Corkum's reencounters of the freed electron with the atom. We find that the bows are not filled and thus cannot be due to any bremsstrahlung. Rather, it is a resonant process that we call stimulated recombination (SR). It occurs when an electron with momentum p reencounters the incompletely ionized atom, and interferes with itself still remaining in the ground state. The SR leads to a highly efficient resonant emission at Planck's over 2pi omega=p(2)/2m+I(p) in the form of attosecond pulses. The SR relies on a low level of ionization and strongly benefits from the use of few-cycle laser pulses.
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Affiliation(s)
- A Pukhov
- Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
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