1
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Effersø KL, Henriksen NE. Dissociation of HeH + in the electronic ground state using shaped mid-IR laser pulses. Phys Chem Chem Phys 2024; 26:14140-14148. [PMID: 38695181 DOI: 10.1039/d4cp00852a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Inspired by recent experimental work, we study the control over the laser-driven dissociation of the HeH+ ion in the electronic ground state. Shaped pulses with peak intensities below 1012 W cm-2 are obtained by phase modulation of high-intensity transform-limited femtosecond pulses. We investigate the performance of pulse shaping for a number of shaping parameters targeting both vibrational and rotational excitation pathways. The numerical results show that pulse shaping is most effective at low pulse energies and broad spectral bandwidths, while intense transform-limited pulses with narrow spectral bandwidths maximize dissociation. We show that the control achieved with a quadratic chirped pulse optimized for vibrational ladder climbing, a cascade excitation process of adjacent vibrational levels, is hindered by rotational motion leading to significantly reduced dissociation. Moreover, pulse shaping using higher-order polynomial phase functions is found to provide only a marginal increase in dissociation yields. Our results provide additional insights into the coherent control of bond breaking in diatomic molecules, and demonstrate the efficacy of pulse shaping for a range of pulse energies.
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Affiliation(s)
- Kasper L Effersø
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark.
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark.
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2
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Morichika I, Tsusaka H, Ashihara S. Generation of High-Lying Vibrational States in Carbon Dioxide through Coherent Ladder Climbing. J Phys Chem Lett 2024; 15:4662-4668. [PMID: 38647557 PMCID: PMC11073050 DOI: 10.1021/acs.jpclett.4c00646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/17/2024] [Accepted: 04/18/2024] [Indexed: 04/25/2024]
Abstract
Mid-infrared laser excitation of molecules into high-lying vibrational states offers a novel route to realize controlled ground-state chemistry. Here we successfully demonstrate vibrational ladder climbing in the antisymmetric stretch of CO2 in the condensed phase by using intense down-chirped mid-infrared pulses. Spectrally resolved pump-probe measurements directly observe excited-state absorptions attributed to vibrational populations up to the v = 9 state, whose corresponding energy of 2.5 eV is 46% of the dissociation energy. By the use of global fitting analysis, important spectroscopic parameters in the high-lying vibrational states, such as transition frequencies and relaxation times, are quantitatively characterized. Remarkably, our analysis shows that 40% of the molecules are excited above the typical activation barriers in the metal-catalyzed CO2 conversions. These results not only demonstrate the promising ability of infrared excitation to produce elevated vibrational states but also represent a significant step toward accelerating CO2 conversions and other chemical processes via mode-specific vibrational excitation.
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Affiliation(s)
- Ikki Morichika
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Hiroki Tsusaka
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Satoshi Ashihara
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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3
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Robinson MS, Küpper J. Unraveling the ultrafast dynamics of thermal-energy chemical reactions. Phys Chem Chem Phys 2024; 26:1587-1601. [PMID: 38131437 DOI: 10.1039/d3cp03954d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
In this perspective, we discuss how one can initiate, image, and disentangle the ultrafast elementary steps of thermal-energy chemical dynamics, building upon advances in technology and scientific insight. We propose that combinations of ultrashort mid-infrared laser pulses, controlled molecular species in the gas phase, and forefront imaging techniques allow to unravel the elementary steps of general-chemistry reaction processes in real time. We detail, for prototypical first reaction systems, experimental methods enabling these investigations, how to sufficiently prepare and promote gas-phase samples to thermal-energy reactive states with contemporary ultrashort mid-infrared laser systems, and how to image the initiated ultrafast chemical dynamics. The results of such experiments will clearly further our understanding of general-chemistry reaction dynamics.
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Affiliation(s)
- Matthew S Robinson
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
- Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Jochen Küpper
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
- Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
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4
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Influence of impurity binding energy on the excitation dynamics of doped GaAs quantum dot: Role of noise. J CHEM SCI 2023. [DOI: 10.1007/s12039-023-02137-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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5
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Datta S, Arif SM, Roy D, Ghosh M. External Field‐induced Transitions in Quantum Dot: Role of Noise‐anharmonicity Interplay. ChemistrySelect 2023. [DOI: 10.1002/slct.202203839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Swarnab Datta
- Eklavya Model Residential School Kanksa, West Burdwan 713148 West Bengal India
| | - Sk. Md. Arif
- Department of Chemistry Physical Chemistry Section Visva-Bharati University Santiniketan, Birbhum 731235 West Bengal India
| | - Debi Roy
- Department of Chemistry Abhedananda Mahavidyalaya Sainthia, Birbhum 731234 West Bengal India
| | - Manas Ghosh
- Department of Chemistry Physical Chemistry Section Visva-Bharati University Santiniketan, Birbhum 731235 West Bengal India
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6
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Seal D, Naskar P, Chaudhury P, Ghosh S. Dissociation of HF molecule in position and momentum representation by an optimally controlled polychromatic field: study in the dual space using simulated annealing. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2131645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Dipayan Seal
- Department of Chemistry, University of Calcutta, Kolkata, India
| | - Pulak Naskar
- Department of Chemistry, Mrinalini Datta Mahavidyapith, Kolkata, India
| | | | - Subhasree Ghosh
- Department of Chemistry, Serampore College, Hoogly, Serampore, India
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7
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Wustelt P, Oppermann F, Mhatre S, Kübel M, Sayler AM, Lein M, Gräfe S, Paulus GG. Laser-Driven Anharmonic Oscillator: Ground-State Dissociation of the Helium Hydride Molecular Ion by Midinfrared Pulses. PHYSICAL REVIEW LETTERS 2021; 127:043202. [PMID: 34355921 DOI: 10.1103/physrevlett.127.043202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 04/06/2021] [Accepted: 04/27/2021] [Indexed: 06/13/2023]
Abstract
The vibrational motion of molecules represents a fundamental example of an anharmonic oscillator. Using a prototype molecular system, HeH^{+}, we demonstrate that appropriate laser pulses make it possible to drive the nuclear motion in the anharmonic potential of the electronic ground state, increasing its energy above the potential barrier and facilitating dissociation by purely vibrational excitation. We find excellent agreement between the frequency-dependent response of the helium hydride molecular cation to both classical and quantum mechanical simulations, thus removing any ambiguities through electronic excitation. Our results provide access to the rich dynamics of anharmonic quantum oscillator systems and pave the way to state-selective control schemes in ground-state chemistry by the adequate choice of the laser parameters.
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Affiliation(s)
- Philipp Wustelt
- Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, D-07743 Jena, Germany
- Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - Florian Oppermann
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
| | - Saurabh Mhatre
- Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Matthias Kübel
- Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, D-07743 Jena, Germany
- Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - A Max Sayler
- Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, D-07743 Jena, Germany
- Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - Manfred Lein
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
| | - Stefanie Gräfe
- Institute of Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Gerhard G Paulus
- Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, D-07743 Jena, Germany
- Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
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8
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Crippa G, Faccialà D, Prasannan Geetha P, Pusala A, Musheghyan M, Assion A, Bonanomi M, Cinquanta E, Ciriolo AG, Devetta M, Fazzi D, Gatto L, De Silvestri S, Vozzi C, Stagira S. Time-domain spectroscopy of methane excited by resonant high-energy mid-IR pulses. JPHYS PHOTONICS 2021. [DOI: 10.1088/2515-7647/ac0d0e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract
We describe the implementation of nonlinear time-domain spectroscopy of rotovibrational IR-active modes in methane through broadband Four-Wave Mixing driven by resonant high-energy mid infrared laser pulses. At high driving pulse intensities we observe an efficient vibrational ladder climbing triggered in the molecules. This study opens the possibility to impulsively and selectively excite molecules of biological interest to high-lying vibrational states and to characterize their dynamics.
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9
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de Lima EF, de Carvalho RE, Forlevesi MD. Nonchaotic laser pulse dissociation through deformed tori. Phys Rev E 2020; 101:022207. [PMID: 32168701 DOI: 10.1103/physreve.101.022207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
We consider the nonlinear classical dynamics of a diatomic molecule under the action of a laser field in the framework of the driven Morse oscillator model. We investigate the influence of the dipole function and the laser field on the deformations of the surviving, invariant tori. For intense and high-frequency fields, some invariant tori traverse the separatrix of motion, visiting both the bound and unbound regions of the interatomic potential. Based on this fact, we propose the use of appropriately designed laser pulses to induce dissociation of trajectories on such invariant tori. This mechanism constitutes a controlled nonchaotic route for dissociation, which is an alternative to chaotic multiphoton dissociation and to chirped pulse dissociation.
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Affiliation(s)
- Emanuel F de Lima
- Departamento de Física, Universidade Federal de São Carlos São Carlos SP 13565-905, Brazil
| | - R Egydio de Carvalho
- Universidade Estadual Paulista (UNESP) Instituto de Geociências e Ciências Exatas-IGCE Rio Claro SP 13506-900, Brazil
| | - M D Forlevesi
- Universidade Estadual Paulista (UNESP) Instituto de Geociências e Ciências Exatas-IGCE Rio Claro SP 13506-900, Brazil
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10
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Mackin RT, Cohn B, Chuntonov L, Rubtsov IV. Intense-field interaction regime with weak laser pulses and localized plasmonic enhancement: Reference-free demonstration by 3rd- and 5th-order infrared spectroscopies. J Chem Phys 2019; 151:121103. [DOI: 10.1063/1.5120531] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Robert T. Mackin
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA
| | - Bar Cohn
- Schulich Faculty of Chemistry, and Solid State Institute, Technion, Haifa, Israel
| | - Lev Chuntonov
- Schulich Faculty of Chemistry, and Solid State Institute, Technion, Haifa, Israel
| | - Igor V. Rubtsov
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA
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11
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Wolf JP. Short-pulse lasers for weather control. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:026001. [PMID: 28783040 DOI: 10.1088/1361-6633/aa8488] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Filamentation of ultra-short TW-class lasers recently opened new perspectives in atmospheric research. Laser filaments are self-sustained light structures of 0.1-1 mm in diameter, spanning over hundreds of meters in length, and producing a low density plasma (1015-1017 cm-3) along their path. They stem from the dynamic balance between Kerr self-focusing and defocusing by the self-generated plasma and/or non-linear polarization saturation. While non-linearly propagating in air, these filamentary structures produce a coherent supercontinuum (from 230 nm to 4 µm, for a 800 nm laser wavelength) by self-phase modulation (SPM), which can be used for remote 3D-monitoring of atmospheric components by Lidar (Light Detection and Ranging). However, due to their high intensity (1013-1014 W cm-2), they also modify the chemical composition of the air via photo-ionization and photo-dissociation of the molecules and aerosols present in the laser path. These unique properties were recently exploited for investigating the capability of modulating some key atmospheric processes, like lightning from thunderclouds, water vapor condensation, fog formation and dissipation, and light scattering (albedo) from high altitude clouds for radiative forcing management. Here we review recent spectacular advances in this context, achieved both in the laboratory and in the field, reveal their underlying mechanisms, and discuss the applicability of using these new non-linear photonic catalysts for real scale weather control.
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Affiliation(s)
- J P Wolf
- Department of Applied Physics (GAP), University of Geneva, 1211 Geneva 4, Switzerland
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12
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Kemlin V, Bonvalet A, Daniault L, Joffre M. Transient Two-Dimensional Infrared Spectroscopy in a Vibrational Ladder. J Phys Chem Lett 2016; 7:3377-3382. [PMID: 27508408 DOI: 10.1021/acs.jpclett.6b01535] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on transient 2D Fourier transform infrared spectroscopy (2DIR) after vibrational ladder climbing induced in the CO-moiety longitudinal stretch of carboxyhemoglobin. The population distribution, spreading up to seven vibrational levels, results in a nonequilibrium 2DIR spectrum evidencing a large number of peaks that can be easily attributed to individual transitions thanks to the anharmonicity of the vibrational potential. We discuss the physical origin of the observed peaks as well as the qualitative behavior of the subsequent dynamics governed by population relaxation in the vibrational ladder.
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Affiliation(s)
- Vincent Kemlin
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM, Université Paris-Saclay , 91128 Palaiseau, France
| | - Adeline Bonvalet
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM, Université Paris-Saclay , 91128 Palaiseau, France
| | - Louis Daniault
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM, Université Paris-Saclay , 91128 Palaiseau, France
| | - Manuel Joffre
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM, Université Paris-Saclay , 91128 Palaiseau, France
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13
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Thomas EF, Henriksen NE. Non-resonant dynamic stark control of vibrational motion with optimized laser pulses. J Chem Phys 2016; 144:244307. [PMID: 27369515 DOI: 10.1063/1.4954663] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The term dynamic Stark control (DSC) has been used to describe methods of quantum control related to the dynamic Stark effect, i.e., a time-dependent distortion of energy levels. Here, we employ analytical models that present clear and concise interpretations of the principles behind DSC. Within a linearly forced harmonic oscillator model of vibrational excitation, we show how the vibrational amplitude is related to the pulse envelope, and independent of the carrier frequency of the laser pulse, in the DSC regime. Furthermore, we shed light on the DSC regarding the construction of optimal pulse envelopes - from a time-domain as well as a frequency-domain perspective. Finally, in a numerical study beyond the linearly forced harmonic oscillator model, we show that a pulse envelope can be constructed such that a vibrational excitation into a specific excited vibrational eigenstate is accomplished. The pulse envelope is constructed such that high intensities are avoided in order to eliminate the process of ionization.
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Affiliation(s)
- Esben F Thomas
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark
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14
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Engin S, Sisourat N, Selles P, Taïeb R, Carniato S. Theoretical study of Raman chirped adiabatic passage by X-ray absorption spectroscopy: highly excited electronic states and rotational effects. J Chem Phys 2015; 140:234303. [PMID: 24952537 DOI: 10.1063/1.4882281] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Raman Chirped Adiabatic Passage (RCAP) is an efficient method to climb the vibrational ladder of molecules. It was shown on the example of fixed-in-space HCl molecule that selective vibrational excitation can thus be achieved by RCAP and that population transfer can be followed by X-ray Photoelectron spectroscopy [S. Engin, N. Sisourat, P. Selles, R. Taïeb, and S. Carniato, Chem. Phys. Lett. 535, 192-195 (2012)]. Here, in a more detailed analysis of the process, we investigate the effects of highly excited electronic states and of molecular rotation on the efficiency of RCAP. Furthermore, we propose an alternative spectroscopic way to monitor the transfer by means of X-ray absorption spectra.
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Affiliation(s)
- Selma Engin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - Nicolas Sisourat
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - Patricia Selles
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - Richard Taïeb
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
| | - Stéphane Carniato
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, F-75005 Paris, France
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15
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Lisaj M, Kühn O. Laser-driven localization of collective CO vibrations in metal-carbonyl complexes. J Chem Phys 2014; 141:204303. [PMID: 25429938 DOI: 10.1063/1.4902067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Using the example of a cobalt dicarbonyl complex it is shown that two perpendicular linearly polarized IR laser pulses can be used to trigger an excitation of the delocalized CO stretching modes, which corresponds to an alternating localization of the vibration within one CO bond. The switching time for localization in either of the two bonds is determined by the energy gap between the symmetric and asymmetric fundamental transition frequencies. The phase of the oscillation between the two local bond excitations can be tuned by the relative phase of the two pulses. The extend of control of bond localization is limited by the anharmonicity of the potential energy surfaces leading to wave packet dispersion. This prevents such a simple pulse scheme from being used for laser-driven bond breaking in the considered example.
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Affiliation(s)
- Mateusz Lisaj
- Institut für Physik, Universität Rostock, Universitätsplatz 3, 18055 Rostock, Germany
| | - Oliver Kühn
- Institut für Physik, Universität Rostock, Universitätsplatz 3, 18055 Rostock, Germany
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16
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17
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Goelman G, Leigh JS. Multi-band Adiabatic Inversion Pulses for Use with the 8th-order Hadamard Spectroscopic Imaging Technique. Isr J Chem 2013. [DOI: 10.1002/ijch.199200034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Sowlati-Hashjin S, Matta CF. The chemical bond in external electric fields: Energies, geometries, and vibrational Stark shifts of diatomic molecules. J Chem Phys 2013; 139:144101. [DOI: 10.1063/1.4820487] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Khan BA. Photodissociation dynamics of triatomic molecule in presence of pulsed and bichromatic laser field. Mol Phys 2013. [DOI: 10.1080/00268976.2013.832818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Schlegel HB. Molecular Dynamics in Strong Laser Fields: A New Algorithm for ab Initio Classical Trajectories. J Chem Theory Comput 2013; 9:3293-8. [DOI: 10.1021/ct400388j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. Bernhard Schlegel
- Department of Chemistry,
Wayne State University, Detroit,
Michigan 48202, United States
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21
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Engin S, Sisourat N, Selles P, Taïeb R, Carniato S. Raman Chirped Adiabatic Passage Probed by X-ray Spectroscopy. J Phys Chem A 2013; 117:8132-8. [DOI: 10.1021/jp401125a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Selma Engin
- Laboratoire de Chimie Physique Matière et Rayonnement, Université Pierre et Marie Curie
- CNRS (UMR 7614), Paris,
France
| | - Nicolas Sisourat
- Laboratoire de Chimie Physique Matière et Rayonnement, Université Pierre et Marie Curie
- CNRS (UMR 7614), Paris,
France
| | - Patricia Selles
- Laboratoire de Chimie Physique Matière et Rayonnement, Université Pierre et Marie Curie
- CNRS (UMR 7614), Paris,
France
| | - Richard Taïeb
- Laboratoire de Chimie Physique Matière et Rayonnement, Université Pierre et Marie Curie
- CNRS (UMR 7614), Paris,
France
| | - Stéphane Carniato
- Laboratoire de Chimie Physique Matière et Rayonnement, Université Pierre et Marie Curie
- CNRS (UMR 7614), Paris,
France
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22
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Su Q, Han Y, Cong SL. Quantum control of multi-photon dissociation of HCl+ with intense femtosecond laser pulses. J Chem Phys 2013; 138:024304. [DOI: 10.1063/1.4773022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Picón A, Jaroń-Becker A, Becker A. Enhancement of vibrational excitation and dissociation of H2(+) in infrared laser pulses. PHYSICAL REVIEW LETTERS 2012; 109:163002. [PMID: 23215074 DOI: 10.1103/physrevlett.109.163002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Indexed: 06/01/2023]
Abstract
We study vibrational excitations, dissociation, and ionization of H(2)(+) in few-cycle laser pulses over a broad wavelength regime. Our results of numerical simulations supported by model calculations show a many orders-of-magnitude enhancement of vibrational excitation and dissociation (over ionization) of the molecular ion at infrared wavelengths. The enhancement occurs without any chirping of the pulse, which was previously applied to take account of the anharmonicity of the molecular vibrations. The effect is related to strong-field two- and higher-order photon transitions between different vibrational states.
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Affiliation(s)
- A Picón
- JILA and Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA
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24
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McCormack EA, Lowth HS, Bell MT, Weidmann D, Ritchie GAD. Population transfer and rapid passage effects in a low pressure gas using a continuous wave quantum cascade laser. J Chem Phys 2012; 137:034306. [DOI: 10.1063/1.4734020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Feng LQ, Chu TS. Intensity enhancement in the molecular ionization and dissociation dynamics in the presence of noise. J Mol Model 2012; 18:5097-106. [PMID: 22752547 DOI: 10.1007/s00894-012-1511-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Accepted: 06/14/2012] [Indexed: 10/28/2022]
Abstract
The ionization and the dissociation of the diatomic molecular ion H(2)(+) have been investigated within a scheme where a noise field is added to an intense infrared laser field. The results show that both the ionization and the dissociation probabilities are enhanced with the introduction of the additional noise (the Gaussian white noise or the color noise) field. Further, by tuning the noise intensity and the delay time between the laser and the noise, a stochastic resonancelike curve is observed for the ionization or the dissociation dynamics, showing the existence of an optimal noise intensity and delay time for the given laser field.
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Affiliation(s)
- Li-Qiang Feng
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian 116023, China
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Mondal CK, Nath B. Modeling Photo-dissociation Dynamics of HBr + by Vibrational Wave-packet Formalism. CHINESE J CHEM PHYS 2012. [DOI: 10.1088/1674-0068/25/03/269-276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Sharma S, Singh H. Laser pulse shaping for optimal control of multiphoton dissociation in a diatomic molecule using genetic algorithm optimization. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.10.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Feng H, Li P, Zheng Y. An analytic algebraic approach to study the influence of molecular alignment and orientation on multiphoton excitation in intense laser fields. Mol Phys 2011. [DOI: 10.1080/00268976.2011.627383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Hairan Feng
- a Department of Physics and Information Engineering , Jining University , Qufu, 273155 , China
| | - Peng Li
- a Department of Physics and Information Engineering , Jining University , Qufu, 273155 , China
| | - Yujun Zheng
- b School of Physics, Shandong University , Jinan 250100 , China
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29
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Tremblay JC, Monturet S, Saalfrank P. The effects of electron-hole pair coupling on the infrared laser-controlled vibrational excitation of NO on Au(111). J Phys Chem A 2011; 115:10698-707. [PMID: 21861512 DOI: 10.1021/jp205902k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we present theoretical simulations of laser-driven vibrational control of NO adsorbed on a gold surface. Our goal is to tailor laser pulses to selectively excite specific modes and vibrational eigenstates, as well as to favor photodesorption of the adsorbed molecule. To this end, various control schemes and algorithms are applied. For adsorbates at metallic surfaces, the creation of electron-hole pairs in the substrate is known to play a dominant role in the transfer of energy from the system to the surroundings. These nonadiabatic couplings are included perturbatively in our reduced density matrix simulations using a generalization of the state-resolved position-dependent anharmonic rate model we recently introduced. An extension of the reduced density matrix is also proposed to provide a sound model for photodesorption in dissipative systems.
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Affiliation(s)
- Jean Christophe Tremblay
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany.
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30
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Jewariya M, Nagai M, Tanaka K. Ladder climbing on the anharmonic intermolecular potential in an amino acid microcrystal via an intense monocycle terahertz pulse. PHYSICAL REVIEW LETTERS 2010; 105:203003. [PMID: 21231227 DOI: 10.1103/physrevlett.105.203003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Indexed: 05/30/2023]
Abstract
We experimentally demonstrated 20 ladder climbing steps on the anharmonic intermolecular potential in the amino-acid microcrystals with an intense monocycle terahertz pulse. Absorption spectra show the suppression of the peak and enhancement of the low-frequency absorption for the incident electric field amplitude. These results are reproduced by simulations based on coherent transition processes between quantum levels in the anharmonic potential. The appearance of such nonlinearity allows us to control macroscopic motion via a phase-controlled terahertz pulse.
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Affiliation(s)
- Mukesh Jewariya
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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31
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32
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Kondorskiy A, Nanbu S, Teranishi Y, Nakamura H. Control of Chemical Dynamics by Lasers: Theoretical Considerations. J Phys Chem A 2010; 114:6171-87. [DOI: 10.1021/jp911579h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexey Kondorskiy
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Shinkoh Nanbu
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Yoshiaki Teranishi
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Hiroki Nakamura
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
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33
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Liu Y, Gong Q. The long-term evolution of D2+ nuclear wave-packet with interaction of intense femtosecond laser pulse. OPTICS EXPRESS 2009; 17:23629-23636. [PMID: 20052072 DOI: 10.1364/oe.17.023629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We investigate the long-term evolution of D2+ nuclear wave-packet after interacting with a 5 fs, 800 nm laser pulse at an intensity of 0.5 x 10(14) W/cm2. The nuclear wave-packet evolves in field-free condition for very long time after the laser pulse. The collapse and revival of nuclear wave-packet is studied. The scale of the classical time (approximately 25 fs), the revival time (approximately 580 fs) and the super-revival time (approximately 12 ps) are determined from the simulation as well as the calculation. The constituents of long-standing nuclear wave-packet are also analyzed.
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Affiliation(s)
- Yunquan Liu
- Department of Physics School and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
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34
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Iijima H, Nagai R, Nishimori N, Hajima R, Minehara EJ. Frequency-resolved optical gating system with a tellurium crystal for characterizing free-electron lasers in the wavelength range of 10-30 microm. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:123106. [PMID: 20059130 DOI: 10.1063/1.3265318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A second-harmonic generation frequency-resolved optical gating (SHG-FROG) system has been developed for the complete characterization of laser pulses in the wavelength range of 10-30 microm. A tellurium crystal is used so that spectrally resolved autocorrelation signals with a good signal-to-noise ratio are obtained. Pulses (wavelength approximately 22 microm) generated from a free-electron laser are measured by the SHG-FROG system. The SHG intensity profile and the spectrum obtained by FROG measurements are well consistent with those of independent measurements of the pulse length and spectrum. The pulse duration and spectral width determined from the FROG trace are 0.6 ps and 5.2 THz at full width half maximum, respectively.
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Affiliation(s)
- Hokuto Iijima
- Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
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35
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Tremblay JC, Saalfrank P. Selective subsurface absorption of hydrogen in palladium using laser distillation. J Chem Phys 2009; 131:084716. [DOI: 10.1063/1.3212695] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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36
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Local Control Theory: Recent Applications to Energy and Particle Transfer Processes in Molecules. ADVANCES IN CHEMICAL PHYSICS 2009. [DOI: 10.1002/9780470431917.ch2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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37
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Klaumünzer B, Kröner D. N-Inversion in 2-azabicyclopentane derivatives: model simulations for a laser controlled molecular switch. NEW J CHEM 2009. [DOI: 10.1039/b812319e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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38
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Seidl M, Etinski M, Uiberacker C, Jakubetz W. Pulse-train control of branching processes: elimination of background and intruder state population. J Chem Phys 2008; 129:234305. [PMID: 19102530 DOI: 10.1063/1.3041380] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The authors introduce and describe pulse train control (PTC) of population branching in strongly coupled processes as a novel control tool for the separation of competing multiphoton processes. Control strategies are presented based on the different responses of processes with different photonicities and/or different frequency detunings to the pulse-to-pulse time delay and the pulse-to-pulse phase shift in pulse trains. The control efficiency is further enhanced by the property of pulse trains that complete population transfer can be obtained over an extended frequency range that replaces the resonance frequency of simple pulses. The possibility to freely tune the frequency assists the separation of the competing processes and reduces the number of subpulses required for full control. As a sample application, PTC of leaking multiphoton resonances is demonstrated by numerical simulations. In model systems exhibiting sizable background (intruder) state population if excited with single pulses, PTC leading to complete accumulation of population in the target state and elimination of background population is readily achieved. The analysis of the results reveals different mechanisms of control and provides clues on the mechanisms of the leaking process itself. In an alternative setup, pulse trains can be used as a phase-sensitive tool for level switching. By changing only the pulse-to-pulse phase shift of a train with otherwise unchanged parameters, population can be transferred to any of two different target states in a near-quantitative manner.
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Affiliation(s)
- Markus Seidl
- Department of Theoretical Chemistry, University of Vienna, 1090 Wien, Austria
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39
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Demirplak M, Rice SA. On the consistency, extremal, and global properties of counterdiabatic fields. J Chem Phys 2008; 129:154111. [DOI: 10.1063/1.2992152] [Citation(s) in RCA: 177] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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40
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Kröner D, Klaumünzer B, Klamroth T. From stochastic pulse optimization to a stereoselective laser pulse sequence: simulation of a chiroptical molecular switch mounted on adamantane. J Phys Chem A 2008; 112:9924-35. [PMID: 18800773 DOI: 10.1021/jp804352q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Quantum dynamical simulations for the laser-controlled isomerization of 1-(2-cis-fluoroethenyl)-2-fluorobenzene mounted on adamantane are reported based on a one-dimensional electronic ground-state potential and dipole moment calculated by density functional theory. The model system 1-(2-cis-fluoroethenyl)-2-fluorobenzene supports two chiral and one achiral atropisomers upon torsion around the C-C single bond connecting the phenyl ring and ethylene group. The molecule itself is bound to an adamantyl frame which serves as a model for a linker or a surface. Due to the C3 symmetry of the adamantane molecule, the molecular switch can have three equivalent orientations. An infrared picosecond pulse is used to excite the internal rotation around the chiral axis, thereby controlling the chirality of the molecule. In order to selectively switch the molecules--independent of their orientations-- from their achiral to either their left- or right-handed form, a stochastic pulse optimization algorithm is applied. A subsequent detailed analysis of the optimal pulse allows for the design of a stereoselective laser pulse sequence of analytical form. The developed control scheme of elliptically polarized laser pulses is enantioselective and orientation-selective.
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Affiliation(s)
- Dominik Kröner
- Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany.
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41
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Clow SD, Trallero-Herrero C, Bergeman T, Weinacht T. Strong field multiphoton inversion of a three-level system using shaped ultrafast laser pulses. PHYSICAL REVIEW LETTERS 2008; 100:233603. [PMID: 18643499 DOI: 10.1103/physrevlett.100.233603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Revised: 12/13/2007] [Indexed: 05/26/2023]
Abstract
We demonstrate strong-field population inversion in a three-level system with single and multiphoton coupling between levels using a single shaped ultrafast laser pulse. Our interpretation of the pulse shape dependence illustrates the difference between sequential population transfer and adiabatic rapid passage in three-level systems with multiphoton coupling between levels.
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Affiliation(s)
- Stephen D Clow
- Department of Physics Stony Brook University, Stony Brook, NY 11794, USA
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42
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Pulse-train control of multiphoton transitions in anharmonic progressions: Resonance loci and resonance ridges. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.02.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Tremblay JC, Beyvers S, Saalfrank P. Selective excitation of coupled CO vibrations on a dissipative Cu(100) surface by shaped infrared laser pulses. J Chem Phys 2008; 128:194709. [DOI: 10.1063/1.2916710] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Barth I, Manz J, Sebald P. Spinning a pseudorotating molecular top by means of a circularly polarized infrared laser pulse: Quantum simulations for 114CdH2. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.02.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Ghosh M, Hazra RK, Bhattacharyya S. Response dynamics of 2-D quantum dots in the presence of time-varying fields: Anharmonicity and pulse shape effects. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.01.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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46
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High energy femtosecond mid-infrared generation pumped by a two-color Ti:sapphire multipass amplifier. CHINESE SCIENCE BULLETIN-CHINESE 2008. [DOI: 10.1007/s11434-008-0158-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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47
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Zhdanovich S, Shapiro EA, Shapiro M, Hepburn JW, Milner V. Population transfer between two quantum states by piecewise chirping of femtosecond pulses: theory and experiment. PHYSICAL REVIEW LETTERS 2008; 100:103004. [PMID: 18352183 DOI: 10.1103/physrevlett.100.103004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2007] [Indexed: 05/26/2023]
Abstract
We propose and experimentally demonstrate the method of population transfer by piecewise adiabatic passage between two quantum states. Coherent excitation of a two-level system with a train of ultrashort laser pulses is shown to reproduce the effect of an adiabatic passage, conventionally achieved with a single frequency-chirped pulse. By properly adjusting the amplitudes and phases of the pulses in the excitation pulse train, we achieve complete and robust population transfer to the target state. The piecewise nature of the process suggests a possibility for the selective population transfer in complex quantum systems.
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Affiliation(s)
- S Zhdanovich
- Department of Physics, The University of British Columbia, Vancouver, Canada
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48
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Ghosh M, Sharma R, Bhattacharyya S. Target excitation in 2-D quantum dots by optimized chirped pulses. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.10.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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49
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Marquetand P, Engel V. Local control theory applied to molecular photoassociation. J Chem Phys 2007; 127:084115. [PMID: 17764237 DOI: 10.1063/1.2762222] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Local control theory (LCT) is employed to achieve molecular photoassociation with shaped laser pulses. Within LCT, the control fields are constructed from the response of the system to the perturbation which makes them accessible to a straightforward interpretation. This is shown regarding the ground-state collision of H+F and H+I atoms. Different objectives are defined, which aim at the formation of vibrational cold or hot associated molecules, respectively. Results are presented for s-wave scattering, where the rotational degree of freedom is ignored and also for full scale calculations including rotations, in order to describe more realistic conditions.
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Affiliation(s)
- Philipp Marquetand
- Universität Würzburg, Institut für Physikalische Chemie, Am Hubland, 97074 Würzburg, Germany
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50
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Kröner D, Klaumünzer B. Laser-operated chiral molecular switch: quantum simulations for the controlled transformation between achiral and chiral atropisomers. Phys Chem Chem Phys 2007; 9:5009-17. [PMID: 17851597 DOI: 10.1039/b705974d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We report quantum dynamical simulations for the laser controlled isomerization of 1-(2-cis-fluoroethenyl)-2-fluorobenzene based on one-dimensional electronic ground and excited state potentials obtained from (TD)DFT calculations. 1-(2-cis-fluoroethenyl)-2-fluorobenzene supports two chiral and one achiral atropisomers, the latter being the most stable isomer at room temperature. Using a linearly polarized IR laser pulse the molecule is excited to an internal rotation around its chiral axis, i.e. around the C-C single bond between phenyl ring and ethenyl group, changing the molecular chirality. A second linearly polarized laser pulse stops the torsion to prepare the desired enantiomeric form of the molecule. This laser control allows the selective switching between the achiral and either the left- or right-handed form of the molecule. Once the chirality is "switched on" linearly polarized UV laser pulses allow the selective change of the chirality using the electronic excited state as intermediate state.
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Affiliation(s)
- Dominik Kröner
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str 24-25, D-14476, Potsdam, Germany.
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