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Dray N, Suraud E, Dossat C, Chatry N. RayActive: An all-in-one R2S neutron induced activation analysis tool based on new intrinsic resolution methods. Nuclear Engineering and Design 2022. [DOI: 10.1016/j.nucengdes.2021.111548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
We study from a theoretical perspective the ionization of molecules and clusters induced by irradiation of a combined two-color laser field consisting of a train of attosecond XUV pulses in the presence of an IR field.
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Affiliation(s)
- C.-Z. Gao
- Laboratoire de Physique Théorique
- Université de Toulouse
- CNRS
- UPS
- France
| | - P. M. Dinh
- Laboratoire de Physique Théorique
- Université de Toulouse
- CNRS
- UPS
- France
| | - P.-G. Reinhard
- Institut für Theoretische Physik
- Universität Erlangen
- Erlangen
- Germany
| | - E. Suraud
- Laboratoire de Physique Théorique
- Université de Toulouse
- CNRS
- UPS
- France
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Escartín JM, Vincendon M, Romaniello P, Dinh PM, Reinhard PG, Suraud E. Towards time-dependent current-density-functional theory in the non-linear regime. J Chem Phys 2015; 142:084118. [PMID: 25725723 DOI: 10.1063/1.4913291] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Time-Dependent Density-Functional Theory (TDDFT) is a well-established theoretical approach to describe and understand irradiation processes in clusters and molecules. However, within the so-called adiabatic local density approximation (ALDA) to the exchange-correlation (xc) potential, TDDFT can show insufficiencies, particularly in violently dynamical processes. This is because within ALDA the xc potential is instantaneous and is a local functional of the density, which means that this approximation neglects memory effects and long-range effects. A way to go beyond ALDA is to use Time-Dependent Current-Density-Functional Theory (TDCDFT), in which the basic quantity is the current density rather than the density as in TDDFT. This has been shown to offer an adequate account of dissipation in the linear domain when the Vignale-Kohn (VK) functional is used. Here, we go beyond the linear regime and we explore this formulation in the time domain. In this case, the equations become very involved making the computation out of reach; we hence propose an approximation to the VK functional which allows us to calculate the dynamics in real time and at the same time to keep most of the physics described by the VK functional. We apply this formulation to the calculation of the time-dependent dipole moment of Ca, Mg and Na2. Our results show trends similar to what was previously observed in model systems or within linear response. In the non-linear domain, our results show that relaxation times do not decrease with increasing deposited excitation energy, which sets some limitations to the practical use of TDCDFT in such a domain of excitations.
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Affiliation(s)
- J M Escartín
- Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC, F-31062 Toulouse Cedex, France
| | - M Vincendon
- Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC, F-31062 Toulouse Cedex, France
| | - P Romaniello
- Laboratoire de Physique Théorique, CNRS, IRSAMC, Université Toulouse III - Paul Sabatier and European Theoretical Spectroscopy Facility, 118 Route de Narbonne, 31062 Toulouse Cedex, France
| | - P M Dinh
- Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC, F-31062 Toulouse Cedex, France
| | - P-G Reinhard
- Institut für Theoretische Physik, Universität Erlangen, Staudtstraße 7, D-91058 Erlangen, Germany
| | - E Suraud
- Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC, F-31062 Toulouse Cedex, France
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Neidel C, Klei J, Yang CH, Rouzée A, Vrakking MJJ, Klünder K, Miranda M, Arnold CL, Fordell T, L'Huillier A, Gisselbrecht M, Johnsson P, Dinh MP, Suraud E, Reinhard PG, Despré V, Marques MAL, Lépine F. Probing time-dependent molecular dipoles on the attosecond time scale. Phys Rev Lett 2013; 111:033001. [PMID: 23909314 DOI: 10.1103/physrevlett.111.033001] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Indexed: 06/02/2023]
Abstract
Photoinduced molecular processes start with the interaction of the instantaneous electric field of the incident light with the electronic degrees of freedom. This early attosecond electronic motion impacts the fate of the photoinduced reactions. We report the first observation of attosecond time scale electron dynamics in a series of small- and medium-sized neutral molecules (N(2), CO(2), and C(2)H(4)), monitoring time-dependent variations of the parent molecular ion yield in the ionization by an attosecond pulse, and thereby probing the time-dependent dipole induced by a moderately strong near-infrared laser field. This approach can be generalized to other molecular species and may be regarded as a first example of molecular attosecond Stark spectroscopy.
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Affiliation(s)
- Ch Neidel
- Max-Born Institut, Max-Born Strasse 2A, 12489 Berlin, Germany
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Messud J, Wang Z, Dinh P, Reinhard PG, Suraud E. Polarizabilities as a test of localized approximations to the self-interaction correction. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Messud J, Dinh PM, Reinhard PG, Suraud E. Time-dependent density-functional theory with a self-interaction correction. Phys Rev Lett 2008; 101:096404. [PMID: 18851631 DOI: 10.1103/physrevlett.101.096404] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Indexed: 05/26/2023]
Abstract
We discuss an implementation of the self-interaction correction for the local-density approximation to time-dependent density-functional theory. A variational formulation is given, taking care of the necessary constraints. A manageable and transparent propagation scheme using two sets of wave functions is proposed and applied to laser excitation with subsequent ionization of a dimer molecule.
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Affiliation(s)
- J Messud
- Laboratoire de Physique Théorique, IRSAMC, CNRS, Université de Toulouse, F-31062 Toulouse, France
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Abstract
We investigate theoretically pump and probe dynamics in metal clusters with crossed-polarization laser beams. We explore the relation between the pronounced Mie plasmon resonance and the laser frequency. The resonance moves with the cluster radius and splits according to the actual deformation. We demonstrate that probe pulses with different (linear) polarization axes allow one to resolve the global shape oscillations of the cluster in monopole and quadrupole degrees of freedom.
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Affiliation(s)
- K Andrae
- Institut für Theoretische Physik, Universität Erlangen, Staudtstrasse 7, D-91058 Erlangen, Germany
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Gervais B, Giglio E, Jacquet E, Ipatov A, Reinhard PG, Suraud E. Simple DFT model of clusters embedded in rare gas matrix: Trapping sites and spectroscopic properties of Na embedded in Ar. J Chem Phys 2004; 121:8466-80. [PMID: 15511170 DOI: 10.1063/1.1789473] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present a theoretical model to study the dynamics of metallic clusters embedded in a rare gas matrix. We describe the active electrons of the embedded cluster using time dependent density functional theory, while the surrounding matrix is described in terms of classical molecular dynamics of polarizable atoms. The coupling between the cluster and the rare gas atoms is deduced from the work of Gross and Spiegelmann [J. Chem. Phys. 108, 4148 (1998)] and reformulated explicitly in a simple and efficient density functional form. The electron rare gas interaction takes the form of an averaged dipole fluctuation term, which retains the van der Waals long range interaction, and a short range repulsive pseudopotential, which accounts for the Pauli repulsion of the electron by the rare gas atom. We applied our model to Na clusters embedded in Ar matrix. For the latter we developed an efficient local pseudopotential, which allows studying systems containing more than 10(3) Ar atoms. We show that large systems are indeed necessary to account properly for long range polarization of the matrix, that competes with the matrix confinement effect. We focus our study on Na(2), Na(4), and Na(8). For each system, we have determined the geometry of the most favorable trapping site by means of damped molecular dynamics. We present the effect of matrix embedding on the optical absorption spectrum. For Na(2), the trapping site can be unambiguously identified by comparison of the absorption spectrum with experiment. For Na(4) the spectrum of the embedded cluster is significantly different from the free cluster spectrum, while for Na(8) differences are less pronounced.
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Affiliation(s)
- B Gervais
- CIRIL, unité mixte CEA-CNRS-ENSICAEN et Université de Caen Basse-Normandie BP 5133, F-14070 Caen Cedex 05, France
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Suraud E, Reinhard PG. Impact of ionic motion on ionization of metal clusters under intense laser pulses. Phys Rev Lett 2000; 85:2296-2299. [PMID: 10977995 DOI: 10.1103/physrevlett.85.2296] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/1999] [Indexed: 05/23/2023]
Abstract
We discuss the impact of ionic motion on ionization of metal clusters subject to intense laser pulses in a microscopic approach. We show that for long enough pulses, ionic expansion can drive the system into resonance with the electronic plasmon resonance, which leads to a strongly enhanced ionization.
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Affiliation(s)
- E Suraud
- Laboratoire Physique Quantique, Universite P. Sabatier, 118 Route de Narbonne, 31062 Toulouse, cedex, France
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Abstract
We investigate the kinetic-energy spectra of electrons emitted from a metal cluster following laser excitation. This is done in the framework of a coupled ionic and electronic dynamics. Properly chosen laser parameters, leading to gentle excitations, yield kinetic-energy spectra which nicely resolve the multiphoton processes for each occupied state separately. This gives access to the single-particle energies in clusters, provided one works at sufficiently low temperatures and low electron flow.
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Affiliation(s)
- A Pohl
- Institut fur Theoretische Physik, Universitat Erlangen, Staudtstrasse 7, D-91058 Erlangen, Germany
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Reinhard PG, Babst J, Fischer B, Kohl C, Calvayrac F, Suraud E, Hirschmann T, Brack M. Ionic and electronic structure of metal clusters. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s004600050216] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ullrich CA, Domps A, Calvayrac F, Suraud E, Reinhard PG. Electron response of metallic clusters to strong laser pulses and energetic ion collisions. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s004600050207] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bertsch GF, Reinhard P, Suraud E. Particle evaporation from semiclassical dynamics. Phys Rev C Nucl Phys 1996; 53:1440-1443. [PMID: 9971084 DOI: 10.1103/physrevc.53.1440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Calvayrac F, Reinhard PG, Suraud E. Nonlinear plasmon response in highly excited metallic clusters. Phys Rev B Condens Matter 1995; 52:17056-17059. [PMID: 9981129 DOI: 10.1103/physrevb.52.r17056] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zhang FS, Suraud E. Analysis of multifragmentation in a Boltzmann-Langevin approach. Phys Rev C Nucl Phys 1995; 51:3201-3210. [PMID: 9970423 DOI: 10.1103/physrevc.51.3201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Belkacem M, Suraud E, Ayik S. K+ production far below the free nucleon-nucleon threshold in heavy-ion collisions. Phys Rev C Nucl Phys 1993; 47:R16-R20. [PMID: 9968460 DOI: 10.1103/physrevc.47.r16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Tohyama M, Suraud E. Weighted particle method for solving the Boltzmann equation. Phys Rev C Nucl Phys 1991; 43:R1518-R1521. [PMID: 9967256 DOI: 10.1103/physrevc.43.r1518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Welke G, Malfliet R, Grégoire C, Prakash M, Suraud E. Collisional relaxation in simulations of heavy-ion collisions using Boltzmann-type equations. Phys Rev C Nucl Phys 1989; 40:2611-2620. [PMID: 9966273 DOI: 10.1103/physrevc.40.2611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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