1
|
Revival structure of rotational wave packets in the process of the field-free molecular orientation. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
2
|
Hossain MM, Zhang X, Minemoto S, Sakai H. Stronger orientation of state-selected OCS molecules with relative-delay-adjusted nanosecond two-color laser pulses. J Chem Phys 2022; 156:041101. [DOI: 10.1063/5.0075849] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Md. Maruf Hossain
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Xiang Zhang
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shinichirou Minemoto
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hirofumi Sakai
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Institute for Photon Science and Technology, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| |
Collapse
|
3
|
Karra M, Schmidt B, Friedrich B. Quantum dynamics of a polar rotor acted upon by an electric rectangular pulse of variable duration. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1966111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Burkhard Schmidt
- Institut für Mathematik, Freie Universität Berlin, Berlin, Germany
| | | |
Collapse
|
4
|
Nautiyal VV, Devi S, Tyagi A, Vidhani B, Maan A, Prasad V. Orientation and Alignment dynamics of polar molecule driven by shaped laser pulses. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 256:119663. [PMID: 33827039 DOI: 10.1016/j.saa.2021.119663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 02/17/2021] [Accepted: 02/28/2021] [Indexed: 06/12/2023]
Abstract
We review the theoretical status of intense laser induced orientation and alignment-a field of study which lies at the interface of intense laser physics and chemical dynamics and having potential applications such as high harmonic generation, nano-scale processing and control of chemical reactions. The evolution of the rotational wave packet and its dynamics leading to orientation and alignment is the topic of the present discussion. The major part of this article primarily presents an overview of recent theoretical progress in controlling the orientation and alignment dynamics of a molecule by means of shaped laser pulses. The various theoretical approaches that lead to orientation and alignment such as static electrostatic field in combination with laser field(s), combination of orienting and aligning field, combination of aligning fields, combination of orienting fields, application of train of pulses etc. are discussed. It is observed that the train of pulses is quite an efficient tool for increasing the orientation or alignment of a molecule without causing the molecule to ionize. The orientation and alignment both can occur in adiabatic and non-adiabatic conditions with the rotational period of the molecule taken under consideration. The discussion is mostly limited to non-adiabatic rotational excitation (NAREX) i.e. cases in which the pulse duration is shorter than the rotational period of the molecule. We have emphasised on the so called half-cycle pulse (HCP) and square pulse (SQP). The effect of ramped pulses and of collision on the various laser parameters is also studied. We summarize the current discussion by presenting a consistent theoretical approach for describing the action of such pulses on movement of molecules. The impact of a particular pulse shape on the post-pulse dynamics is also calculated and analysed. In addition to this, the roles played by various laser parameters including the laser frequency, the pulse duration and the system temperature etc. are illustrated and discussed. The concept of alignment is extended from one-dimensional alignment to three-dimensional alignment with the proper choice of molecule and the polarised light. We conclude the article by discussing the potential applications of intense laser orientation and alignment.
Collapse
Affiliation(s)
- Vijit V Nautiyal
- Department of Physics and Astrophysics, University of Delhi, Delhi, Delhi 110007, India
| | - Sumana Devi
- Department of Physics and Astrophysics, University of Delhi, Delhi, Delhi 110007, India; Department of Physics, Miranda House College, University of Delhi, Delhi, Delhi 110007, India
| | - Ashish Tyagi
- Department of Physics, Swami Shradhanand College, University of Delhi, Delhi, Delhi 110036, India
| | - Bhavna Vidhani
- Department of Physics, Hansraj College, University of Delhi, Delhi, Delhi 110007, India
| | - Anjali Maan
- Department of Physics, Pt.N.R.S.G.C.Rohtak, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Vinod Prasad
- Department of Physics, Swami Shradhanand College, University of Delhi, Delhi, Delhi 110036, India.
| |
Collapse
|
5
|
Heid CG, Bentham IP, Walpole V, Jambrina PG, Aoiz FJ, Brouard M. Controlling the Spin-Orbit Branching Fraction in Molecular Collisions. J Phys Chem Lett 2021; 12:310-316. [PMID: 33351625 DOI: 10.1021/acs.jpclett.0c02941] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The collision geometry, that is, the relative orientation of reactants before interaction, can have a large effect on how a collision or reaction proceeds. Certain geometries may prevent access to a given product channel, while others might enhance it. In this Letter, we demonstrate how the initial orientation of NO molecules relative to approaching Ar atoms determines the branching between the spin-orbit changing and the spin-orbit conserving rotational product channels. We use a recently developed quantum treatment to calculate differential and integral branching fractions, at any arbitrary orientation, from theoretical and experimental data points. Our results show that a substantial degree of control over the final spin-orbit state of the scattering products can be achieved by tuning the initial collision geometry.
Collapse
Affiliation(s)
- Cornelia G Heid
- Department of Chemistry, University of Oxford, The Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Imogen P Bentham
- Department of Chemistry, University of Oxford, The Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Victoria Walpole
- Department of Chemistry, University of Oxford, The Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Pablo G Jambrina
- Departamento de Química Física, Universidad de Salamanca, 37008 Salamanca, Spain
| | - F Javier Aoiz
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Mark Brouard
- Department of Chemistry, University of Oxford, The Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| |
Collapse
|
6
|
Mun JH, Kim DE. Field-free molecular orientation by delay- and polarization-optimized two fs pulses. Sci Rep 2020; 10:18875. [PMID: 33139806 PMCID: PMC7606518 DOI: 10.1038/s41598-020-75826-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/21/2020] [Indexed: 11/16/2022] Open
Abstract
Unless the molecular axis is fixed in the laboratory frame, intrinsic structural information of molecules can be averaged out over the various rotational states. The macroscopic directional properties of polar molecules have been controlled by two fs pulses with an optimized delay. In the method, the first one-color laser pulse provokes molecular alignment. Subsequently, the molecular sample is irradiated with the second two-color laser pulse, when the initial even-J states are aligned, and the odd-J states are anti-aligned in the thermal ensemble. The second pulse selectively orients only the aligned even-J states in the same direction, which results in significant enhancement of the net degree of orientation. This paper reports the results of simulations showing that the two-pulse technique can be even more powerful when the second pulse is cross-polarized. This study shows that the alignment and orientation can be very well synchronized temporally because the crossed field does not disturb the preformed alignment modulation significantly, suggesting that the molecules are very well confined in the laboratory frame. This cross-polarization method will serve as a promising technique for studying ultrafast molecular spectroscopy in a molecule-fixed frame.
Collapse
Affiliation(s)
- Je Hoi Mun
- Department of Physics and Center for Attosecond Science and Technology, POSTECH, Pohang, 37673, South Korea.
- Max Planck POSTECH/KOREA Research Initiative, Pohang, 37673, South Korea.
| | - Dong Eon Kim
- Department of Physics and Center for Attosecond Science and Technology, POSTECH, Pohang, 37673, South Korea.
- Max Planck POSTECH/KOREA Research Initiative, Pohang, 37673, South Korea.
| |
Collapse
|
7
|
Hossain MM, Sakai H. All-optical orientation of linear molecules with combined linearly and elliptically polarized two-color laser fields. J Chem Phys 2020; 153:104102. [PMID: 32933273 DOI: 10.1063/5.0023396] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We show that a combination of a fundamental pulse with linear polarization along the vertical direction and an elliptically polarized second harmonic pulse with both vertical and horizontal electric field components can be used to orient linear molecules efficiently, leading to higher degrees of orientation. Due to this specific combination of polarizations, the asymmetric hyperpolarizability interaction potential, which remains the same as that in a linearly polarized two-color laser field, is created along the vertical component of the elliptically polarized second harmonic pulse. On the other hand, the horizontal component suppresses the otherwise strong symmetric polarizability potential responsible for alignment, increasing the tunneling probability from the shallower potential well to the deeper one. As a result, the degree of orientation increases and can be controlled by changing the intensity of the horizontal component of the elliptically polarized second harmonic pulse. This study is the generalization of the all-optical molecular orientation technique based on the anisotropic hyperpolarizability interaction.
Collapse
Affiliation(s)
- Md Maruf Hossain
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hirofumi Sakai
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| |
Collapse
|
8
|
Novelli F, Ruiz Pestana L, Bennett KC, Sebastiani F, Adams EM, Stavrias N, Ockelmann T, Colchero A, Hoberg C, Schwaab G, Head-Gordon T, Havenith M. Strong Anisotropy in Liquid Water upon Librational Excitation Using Terahertz Laser Fields. J Phys Chem B 2020; 124:4989-5001. [DOI: 10.1021/acs.jpcb.0c02448] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabio Novelli
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Luis Ruiz Pestana
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Pitzer Center for Theoretical Chemistry, Departments of Chemistry, Chemical and Biomolecular Engineering, and Bioengineering, University of California, Berkeley, Berkeley, California 94720, United States
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, Florida, United States
| | - Kochise C. Bennett
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Pitzer Center for Theoretical Chemistry, Departments of Chemistry, Chemical and Biomolecular Engineering, and Bioengineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Federico Sebastiani
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Ellen M. Adams
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Nikolas Stavrias
- Radboud University, FELIX Laboratory, Toernooiveld 7, Nijmegen, The Netherlands
| | - Thorsten Ockelmann
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Alejandro Colchero
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Claudius Hoberg
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Gerhard Schwaab
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Teresa Head-Gordon
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Pitzer Center for Theoretical Chemistry, Departments of Chemistry, Chemical and Biomolecular Engineering, and Bioengineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Martina Havenith
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| |
Collapse
|
9
|
Souissi H, Mejrissi L, Habli H, Alsahhaf M, Oujia B, Xavier Gadéa EF. Ab initio diabatic and adiabatic calculations for francium hydride FrH. NEW J CHEM 2020. [DOI: 10.1039/c9nj06391a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Explicit ab initio diabatic and adiabatic calculations of potential energy curves (PECs) of the states 1,3Σ+, 1,3Π, and 1,3Δ of francium hydride FrH have been carried out with several approaches.
Collapse
Affiliation(s)
- Hanen Souissi
- Laboratoire de Physique Quantique
- Faculté des Sciences de Monastir
- Université of Monastir
- Monastir
- Tunisia
| | - Leila Mejrissi
- Laboratoire de Physique Quantique
- Faculté des Sciences de Monastir
- Université of Monastir
- Monastir
- Tunisia
| | - Hela Habli
- Laboratoire de Physique Quantique
- Faculté des Sciences de Monastir
- Université of Monastir
- Monastir
- Tunisia
| | - Maarib Alsahhaf
- Physics Department
- Faculty of Science
- Princess Nourah Bint Abdulrahman University
- Riyadh
- Kingdom of Saudi Arabia
| | - Brahim Oujia
- University of Jeddah
- Faculty of Science
- Physics Department
- Jeddah
- Kingdom of Saudi Arabia
| | - et Florent Xavier Gadéa
- Laboratoire de Chimie et Physique Quantique
- UMR5626 du CNRS
- Université de Toulouse
- UPS
- Toulouse Cedex 4
| |
Collapse
|
10
|
Jambrina PG, Menéndez M, Zanchet A, García E, Aoiz FJ. How reactant polarization can be used to change the effect of interference on reactive collisions. Phys Chem Chem Phys 2019; 21:14012-14022. [PMID: 30638224 DOI: 10.1039/c8cp06892e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It is common knowledge that integral and differential cross sections (DCSs) are strongly dependent on the spatial distribution of the molecular axis of the reactants. Hence, by controlling the axis distribution, it is possible to either promote or hinder the yield of products into specific final states or scattering angles. This idea has been successfully implemented in experiments by polarizing the internuclear axis before the reaction takes place, either by manipulating the rotational angular distribution or by the Stark effect in the presence of an orienting field. When there is a dominant reaction mechanism, characterized by a set of impact parameters and angles of attack, it is expected that a preparation that helps the system to reach the transition state associated with that mechanism will promote the reaction, whilst a different preparation would generally impair the reaction. However, when two or more competing mechanisms via interference contribute to the reaction into specific scattering angles and final states, it is not evident which would be the effect of changing the axis preparation. To address this problem, throughout this article we have simulated the effect that different experimental preparations have on the DCSs for the H + D2 reaction at relatively high energies, for which it has been shown that several competing mechanisms give rise to interference that shapes the DCS. To this aim, we have extended the formulation of the polarization dependent DCS to calculate polarization dependent generalized deflection functions of ranks greater than zero. Our results show that interference is very sensitive to changes in the internuclear axis preparation, and that the shape of the DCS can be controlled exquisitely.
Collapse
Affiliation(s)
- P G Jambrina
- Departamento de Química Física, Universidad de Salamanca, Salamanca, 37008, Spain.
| | | | | | | | | |
Collapse
|
11
|
Interferences between En and Mn ( n=1,2…) optical transition moments. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
12
|
Mirahmadi M, Schmidt B, Karra M, Friedrich B. Dynamics of polar polarizable rotors acted upon by unipolar electromagnetic pulses: From the sudden to the adiabatic regime. J Chem Phys 2018; 149:174109. [DOI: 10.1063/1.5051591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Marjan Mirahmadi
- Institute for Mathematics, Freie Universität Berlin, Arnimallee 6, D-14195 Berlin, Germany
| | - Burkhard Schmidt
- Institute for Mathematics, Freie Universität Berlin, Arnimallee 6, D-14195 Berlin, Germany
| | - Mallikarjun Karra
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Bretislav Friedrich
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| |
Collapse
|
13
|
Reid KL. Accessing the molecular frame through strong-field alignment of distributions of gas phase molecules. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2018; 376:rsta.2017.0158. [PMID: 29431684 PMCID: PMC5805919 DOI: 10.1098/rsta.2017.0158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/25/2017] [Indexed: 06/08/2023]
Abstract
A rationale for creating highly aligned distributions of molecules is that it enables vector properties referenced to molecule-fixed axes (the molecular frame) to be determined. In the present work, the degree of alignment that is necessary for this to be achieved in practice is explored. Alignment is commonly parametrized in experiments by a single parameter, [Formula: see text], which is insufficient to enable predictive calculations to be performed. Here, it is shown that, if the full distribution of molecular axes takes a Gaussian form, this single parameter can be used to determine the complete set of alignment moments needed to characterize the distribution. In order to demonstrate the degree of alignment that is required to approach the molecular frame, the alignment moments corresponding to a few chosen values of [Formula: see text] are used to project a model molecular frame photoelectron angular distribution into the laboratory frame. These calculations show that [Formula: see text] needs to approach 0.9 in order to avoid significant blurring to be caused by averaging.This article is part of the theme issue 'Modern theoretical chemistry'.
Collapse
Affiliation(s)
- Katharine L Reid
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
| |
Collapse
|
14
|
Marklund EG, Ekeberg T, Moog M, Benesch JLP, Caleman C. Controlling Protein Orientation in Vacuum Using Electric Fields. J Phys Chem Lett 2017; 8:4540-4544. [PMID: 28862456 DOI: 10.1021/acs.jpclett.7b02005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Single-particle imaging using X-ray free-electron lasers is an emerging technique that could provide high-resolution structures of macromolecules in the gas phase. One of the largest difficulties in realizing this goal is the unknown orientation of the individual sample molecules at the time of exposure. Preorientation of the molecules has been identified as a possible solution to this problem. Using molecular dynamics simulations, we identify a range of electric field strengths where proteins become oriented without losing their structure. For a number of experimentally relevant cases we show that structure determination is possible only when orientation information is included in the orientation-recovery process. We conclude that nondestructive field orientation of intact proteins is feasible and that it enables a range of new structural investigations with single-particle imaging.
Collapse
Affiliation(s)
- Erik G Marklund
- Department of Chemistry - BMC, Uppsala University , Box 576, SE-751 23 Uppsala, Sweden
- Physical & Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford GB-OX1 3QZ, United Kingdom
| | - Tomas Ekeberg
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron , DE-22607 Hamburg, Germany
| | - Mathieu Moog
- Department of Physics and Astronomy, Uppsala University , Box 516, SE-751 20 Uppsala, Sweden
| | - Justin L P Benesch
- Physical & Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford GB-OX1 3QZ, United Kingdom
| | - Carl Caleman
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron , DE-22607 Hamburg, Germany
- Department of Physics and Astronomy, Uppsala University , Box 516, SE-751 20 Uppsala, Sweden
| |
Collapse
|
15
|
Pan H, Wang F, Czakó G, Liu K. Direct mapping of the angle-dependent barrier to reaction for Cl + CHD3 using polarized scattering data. Nat Chem 2017; 9:1175-1180. [DOI: 10.1038/nchem.2858] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 07/28/2017] [Indexed: 11/09/2022]
|
16
|
Chen K, Huang YX, Yang XH. Laser-Assisted Stark Deceleration of Polar Molecules HC2n+1N (n=2, 3, 4) in High-Field-Seeking State. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1704079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
17
|
Controlling the quantum rotational dynamics of a driven planar rotor by rebuilding barriers in the classical phase space. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1312-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
18
|
Thomas EF, Henriksen NE. Phase-Modulated Nonresonant Laser Pulses Can Selectively Convert Enantiomers in a Racemic Mixture. J Phys Chem Lett 2017; 8:2212-2219. [PMID: 28467085 DOI: 10.1021/acs.jpclett.7b00662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Deracemization occurs when a racemic molecular mixture is transformed into a mixture containing an excess of a single enantiomer. Recent advances in ultrafast laser technology hint at the possibility of using shaped pulses to generate deracemization via selective enantiomeric conversion; however, experimental implementation remains a challenge and has not yet been achieved. Here we suggest a simple, yet novel approach to laser-induced enantiomeric conversion based on dynamic Stark control. We demonstrate theoretically that current laser and optical technology can be used to generate a pair of phase-modulated, nonresonant, linearly polarized Gaussian laser pulses that can selectively deracemize a racemic mixture of 3D-oriented, 3,5-difluoro-3',5'-dibromobiphenyl (F2H3C6-C6H3Br2) molecules, the laser-induced dynamics of which are well studied experimentally. These results strongly suggest that designing a closed-loop coherent control scheme based on this methodology may lead to the first-ever achievement of enantiomeric conversion via coherent laser light in a laboratory setting.
Collapse
Affiliation(s)
- Esben F Thomas
- Department of Chemistry, Technical University of Denmark , Building 206, DK-2800 Kongens Lyngby, Denmark
| | - Niels E Henriksen
- Department of Chemistry, Technical University of Denmark , Building 206, DK-2800 Kongens Lyngby, Denmark
| |
Collapse
|
19
|
Floß J, Brumer P. Laser-induced molecular alignment in the presence of chaotic rotational dynamics. J Chem Phys 2017; 146:124313. [DOI: 10.1063/1.4979061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Johannes Floß
- Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Paul Brumer
- Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| |
Collapse
|
20
|
Simulating electric field interactions with polar molecules using spectroscopic databases. Sci Rep 2017; 7:45068. [PMID: 28338042 PMCID: PMC5364483 DOI: 10.1038/srep45068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 02/16/2017] [Indexed: 11/10/2022] Open
Abstract
Ro-vibrational Stark-associated phenomena of small polyatomic molecules are modelled using extensive spectroscopic data generated as part of the ExoMol project. The external field Hamiltonian is built from the computed ro-vibrational line list of the molecule in question. The Hamiltonian we propose is general and suitable for any polar molecule in the presence of an electric field. By exploiting precomputed data, the often prohibitively expensive computations associated with high accuracy simulations of molecule-field interactions are avoided. Applications to strong terahertz field-induced ro-vibrational dynamics of PH3 and NH3, and spontaneous emission data for optoelectrical Sisyphus cooling of H2CO and CH3Cl are discussed.
Collapse
|
21
|
Luo S, Hu W, Yu J, Zhu R, He L, Li X, Ma P, Wang C, Liu F, Roeterdink WG, Stolte S, Ding D. Rotational Dynamics of Quantum State-Selected Symmetric-Top Molecules in Nonresonant Femtosecond Laser Fields. J Phys Chem A 2017; 121:777-783. [PMID: 28067509 DOI: 10.1021/acs.jpca.6b11209] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rotational dynamics of quantum state selected and unselected CH3I molecules in intense femtosecond laser fields has been studied. The orientation and alignment evolutions are derived from a pump-probe measurement and in good agreement with the numerical results from the time-dependent Schrödinger equation (TDSE) calculation. The different rotational transitions through nonresonant Raman process have been assigned from the Fourier analysis of the orientation and alignment revivals. These revivals are derived from a pump-probe measurement and in good agreement with the numerical results from the TDSE calculation. For the molecules in rotational state |1, ±1, ∓1⟩, the transitions can be assigned to ΔJ = ±1, ±2, while for thermally populated molecules, the transitions are ΔJ = ±2. Our results illustrate that the orientation and alignment revivals of the rotational quantum-state-selected molecules give a deep insight into the rotational excitation pathways for the transition of different rotational states of molecules in ultrafast laser fields.
Collapse
Affiliation(s)
- Sizuo Luo
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Wenhui Hu
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Jiaqi Yu
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Ruihan Zhu
- School of Science, Changchun University of Science and Technology , Changchun 130022, China
| | - Lanhai He
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Xiaokai Li
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Pan Ma
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Chuncheng Wang
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Fuchun Liu
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Wim G Roeterdink
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Steven Stolte
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| | - Dajun Ding
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University , Changchun 130012, China
| |
Collapse
|
22
|
Apostol M, Cune L. Molecular dynamics in high electric fields. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
23
|
Sharma K, Friedrich B. Pair-eigenstates and mutual alignment of coupled molecular rotors in a magnetic field. Phys Chem Chem Phys 2016; 18:13467-77. [PMID: 27126576 DOI: 10.1039/c6cp00390g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We examine the rotational states of a pair of polar (2)Σ molecules subject to a uniform magnetic field. The electric dipole-dipole interaction between the molecules creates entangled pair-eigenstates of two types. In one type, the Zeeman interaction between the inherently paramagnetic molecules and the magnetic field destroys the entanglement of the pair-eigenstates, whereas in the other type it does not. The pair-eigenstates exhibit numerous intersections, which become avoided for pair-eigenstates comprised of individual states that meet the selection rules ΔJi = 0, ± 1, ΔNi = 2n (n = 0, ±1, ±2,…), and ΔMi = 0, ± 1 imposed by the electric dipole-dipole operator. Here Ji, Ni and Mi are the total, rotational and projection angular momentum quantum numbers of molecules i = 1, 2 in the absence of the electric dipole-dipole interaction. We evaluate the mutual alignment of the pair-eigenstates and find it to be independent of the magnetic field, except for states that undergo avoided crossings, in which case the alignment of the interacting states is interchanged at the magnetic field corresponding to the crossing point. We present an analytic model which provides ready estimates of the pairwise alignment cosine that characterises the mutual alignment of the pair of coupled rotors.
Collapse
Affiliation(s)
- Ketan Sharma
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
| | - Bretislav Friedrich
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
| |
Collapse
|
24
|
Sun XN, Kim LY, Zhao BS, Chung DS. Rotational-State-Dependent Dispersion of Molecules by Pulsed Optical Standing Waves. PHYSICAL REVIEW LETTERS 2015; 115:223001. [PMID: 26650301 DOI: 10.1103/physrevlett.115.223001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Indexed: 06/05/2023]
Abstract
We report on the rotational-state-dependent, transverse acceleration of CS_{2} molecules affected by pulsed optical standing waves. The steep gradient of the standing wave potential imparts far stronger dipole forces on the molecules than propagating pulses do. Moreover, large changes in the transverse velocities (i.e., up to 80 m/s) obtained with the standing waves are well reproduced in numerical simulations using the effective polarizability that depends on the molecular rotational states. Our analysis based on the rotational-state-dependent effective polarizability can therefore serve as a basis for developing a new technique of state selection for both polar and nonpolar molecules.
Collapse
Affiliation(s)
- Xing Nan Sun
- Department of Chemistry, Seoul National University, Seoul, Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Lee Yeong Kim
- Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Bum Suk Zhao
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, Korea
- Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Doo Soo Chung
- Department of Chemistry, Seoul National University, Seoul, Korea
| |
Collapse
|
25
|
Talukder S, Sen S, Shandilya BK, Sharma R, Chaudhury P, Adhikari S. Enhancing the branching ratios in the dissociation channels for O(16)O(16)O(18) molecule by designing optimum laser pulses: A study using stochastic optimization. J Chem Phys 2015; 143:144109. [PMID: 26472365 DOI: 10.1063/1.4932333] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We propose a strategy of using a stochastic optimization technique, namely, simulated annealing to design optimum laser pulses (both IR and UV) to achieve greater fluxes along the two dissociating channels (O(18) + O(16)O(16) and O(16) + O(16)O(18)) in O(16)O(16)O(18) molecule. We show that the integrated fluxes obtained along the targeted dissociating channel is larger with the optimized pulse than with the unoptimized one. The flux ratios are also more impressive with the optimized pulse than with the unoptimized one. We also look at the evolution contours of the wavefunctions along the two channels with time after the actions of both the IR and UV pulses and compare the profiles for unoptimized (initial) and optimized fields for better understanding the results that we achieve. We also report the pulse parameters obtained as well as the final shapes they take.
Collapse
Affiliation(s)
- Srijeeta Talukder
- Department of Chemistry, University of Calcutta, 92 A P C Road, Kolkata 700 009, India
| | - Shrabani Sen
- Department of Chemistry, Rammohan College, 102/1, Raja Rammohan Sarani, Kolkata 700 009, India
| | - Bhavesh K Shandilya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Rahul Sharma
- Department of Chemistry, St. Xavier's College, 30 Mother Teresa Sarani, Kolkata 700 016, India
| | - Pinaki Chaudhury
- Department of Chemistry, University of Calcutta, 92 A P C Road, Kolkata 700 009, India
| | - Satrajit Adhikari
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| |
Collapse
|
26
|
Milner AA, Korobenko A, Floß J, Averbukh IS, Milner V. Magneto-Optical Properties of Paramagnetic Superrotors. PHYSICAL REVIEW LETTERS 2015; 115:033005. [PMID: 26230789 DOI: 10.1103/physrevlett.115.033005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Indexed: 06/04/2023]
Abstract
We study the dynamics of paramagnetic molecular superrotors in an external magnetic field. An optical centrifuge is used to create dense ensembles of oxygen molecules in ultrahigh rotational states. In is shown, for the first time, that the gas of rotating molecules becomes optically birefringent in the presence of a magnetic field. The discovered effect of "magneto-rotational birefringence" indicates the preferential alignment of molecular axes along the field direction. We provide an intuitive qualitative model, in which the influence of the applied magnetic field on the molecular orientation is mediated by the spin-rotation coupling. This model is supported by the direct imaging of the distribution of molecular axes, the demonstration of the magnetic reversal of the rotational Raman signal, and by numerical calculations.
Collapse
Affiliation(s)
- A A Milner
- Department of Physics and Astronomy, The University of British Columbia, Vancouver V6T 2K9, Canada
| | - A Korobenko
- Department of Physics and Astronomy, The University of British Columbia, Vancouver V6T 2K9, Canada
| | - J Floß
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - I Sh Averbukh
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - V Milner
- Department of Physics and Astronomy, The University of British Columbia, Vancouver V6T 2K9, Canada
| |
Collapse
|
27
|
Aoiz FJ, Brouard M, Gordon SDS, Nichols B, Stolte S, Walpole V. A new perspective: imaging the stereochemistry of molecular collisions. Phys Chem Chem Phys 2015; 17:30210-28. [DOI: 10.1039/c5cp03273c] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The concept of the steric effect plays a central role in chemistry. This Perspective describes how the polarization of reactant molecules in space can be used to probe directly the steric effect, and highlights some of the new measurements that are made possible by coupling reactant orientation and alignment with ion imaging techniques.
Collapse
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física
- Facultad de Química
- Universidad Complutense
- 28040 Madrid
- Spain
| | - M. Brouard
- The Department of Chemistry
- University of Oxford
- The Physical and Theoretical Chemistry Laboratory
- Oxford
- UK
| | - S. D. S. Gordon
- The Department of Chemistry
- University of Oxford
- The Physical and Theoretical Chemistry Laboratory
- Oxford
- UK
| | - B. Nichols
- The Department of Chemistry
- University of Oxford
- The Physical and Theoretical Chemistry Laboratory
- Oxford
- UK
| | - S. Stolte
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Department of Physics and Astronomy
| | - V. Walpole
- The Department of Chemistry
- University of Oxford
- The Physical and Theoretical Chemistry Laboratory
- Oxford
- UK
| |
Collapse
|
28
|
Tyagi A, Arya U, Vidhani B, Prasad V. Pulse train induced rotational excitation and orientation of a polar molecule. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:193-200. [PMID: 24747844 DOI: 10.1016/j.saa.2014.03.075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 02/27/2014] [Accepted: 03/15/2014] [Indexed: 06/03/2023]
Abstract
We investigate theoretically the rotational excitation and field free molecular orientation of polar HBr molecule, interacting with train of ultrashort laser pulses. By adjusting the number of pulses, pulse period and the intensity of the pulse, one can suppress a population while simultaneously enhancing the desired population in particular rotational state. We have used train of laser pulses of different shaped pulse envelopes. The dynamics and orientation of molecules in the presence of pulse train of different shapes is studied and explained.
Collapse
Affiliation(s)
- Ashish Tyagi
- Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi 110036, India.
| | - Urvashi Arya
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India.
| | - Bhavna Vidhani
- Department of Physics, Hansraj College, University of Delhi, Delhi 110007, India.
| | - Vinod Prasad
- Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi 110036, India.
| |
Collapse
|
29
|
Gopakumar G, Abe M, Hada M, Kajita M. Dipole polarizability of alkali-metal (Na, K, Rb)-alkaline-earth-metal (Ca, Sr) polar molecules: prospects for alignment. J Chem Phys 2014; 140:224303. [PMID: 24929384 DOI: 10.1063/1.4881396] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Electronic open-shell ground-state properties of selected alkali-metal-alkaline-earth-metal polar molecules are investigated. We determine potential energy curves of the (2)Σ(+) ground state at the coupled-cluster singles and doubles with partial triples (CCSD(T)) level of electron correlation. Calculated spectroscopic constants for the isotopes ((23)Na, (39)K, (85)Rb)-((40)Ca, (88)Sr) are compared with available theoretical and experimental results. The variation of the permanent dipole moment (PDM), average dipole polarizability, and polarizability anisotropy with internuclear distance is determined using finite-field perturbation theory at the CCSD(T) level. Owing to moderate PDM (KCa: 1.67 D, RbCa: 1.75 D, KSr: 1.27 D, RbSr: 1.41 D) and large polarizability anisotropy (KCa: 566 a.u., RbCa: 604 a.u., KSr: 574 a.u., RbSr: 615 a.u.), KCa, RbCa, KSr, and RbSr are potential candidates for alignment and orientation in combined intense laser and external static electric fields.
Collapse
Affiliation(s)
- Geetha Gopakumar
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Minori Abe
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Masahiko Hada
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Masatoshi Kajita
- National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795, Japan
| |
Collapse
|
30
|
Krupp AT, Gaj A, Balewski JB, Ilzhöfer P, Hofferberth S, Löw R, Pfau T, Kurz M, Schmelcher P. Alignment of D-state Rydberg molecules. PHYSICAL REVIEW LETTERS 2014; 112:143008. [PMID: 24765956 DOI: 10.1103/physrevlett.112.143008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Indexed: 06/03/2023]
Abstract
We report on the formation of ultralong-range Rydberg D-state molecules via photoassociation in an ultracold cloud of rubidium atoms. By applying a magnetic offset field on the order of 10 G and high resolution spectroscopy, we are able to resolve individual rovibrational molecular states. A full theory, using a Fermi pseudopotential approach including s- and p-wave scattering terms, reproduces the measured binding energies. The calculated molecular wave functions show that in the experiment we can selectively excite stationary molecular states with an extraordinary degree of alignment or antialignment with respect to the magnetic field axis.
Collapse
Affiliation(s)
- A T Krupp
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - A Gaj
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - J B Balewski
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - P Ilzhöfer
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - S Hofferberth
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - R Löw
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - T Pfau
- 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - M Kurz
- Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany and The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - P Schmelcher
- Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany and The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| |
Collapse
|
31
|
Schmidt B, Friedrich B. Topology of surfaces for molecular Stark energy, alignment, and orientation generated by combined permanent and induced electric dipole interactions. J Chem Phys 2014; 140:064317. [DOI: 10.1063/1.4864465] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
32
|
Dahiya B, Tyagi A, Prasad V. Dynamics of orientation of adsorbed polar molecules in static electric and laser field. Mol Phys 2013. [DOI: 10.1080/00268976.2013.856487] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Brijender Dahiya
- Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi, India
| | - Ashish Tyagi
- Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi, India
| | - Vinod Prasad
- Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi, India
| |
Collapse
|
33
|
Affiliation(s)
- Mikhail Lemeshko
- a ITAMP, Harvard-Smithsonian Center for Astrophysics , Cambridge , MA , 02138 , USA
- b Physics Department , Harvard University , Cambridge , MA , 02138 , USA
- c Kavli Institute for Theoretical Physics , University of California , Santa Barbara , CA , 93106 , USA
| | - Roman V. Krems
- c Kavli Institute for Theoretical Physics , University of California , Santa Barbara , CA , 93106 , USA
- d Department of Chemistry , University of British Columbia , BC V6T 1Z1, Vancouver , Canada
| | - John M. Doyle
- b Physics Department , Harvard University , Cambridge , MA , 02138 , USA
| | - Sabre Kais
- e Departments of Chemistry and Physics , Purdue University , West Lafayette , IN , 47907 , USA
| |
Collapse
|
34
|
List of publications of Bretislav Friedrich. Mol Phys 2013. [DOI: 10.1080/00268976.2013.792470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
35
|
Bredtmann T, Katsuki H, Manz J, Ohmori K, Stemmle C. Wavepacket interferometry for nuclear densities and flux densities. Mol Phys 2013. [DOI: 10.1080/00268976.2013.780103] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Timm Bredtmann
- a Institut für Chemie und Biochemie, Freie Universität Berlin , Berlin , Germany
| | - Hiroyuki Katsuki
- b Graduate School of Materials Science , Nara Institute of Science and Technology , Ikoma , Japan
| | - Jörn Manz
- a Institut für Chemie und Biochemie, Freie Universität Berlin , Berlin , Germany
- c Laser Spectroscopy Laboratory , Shanxi University , Taiyuan , People’s Republic of China
| | - Kenji Ohmori
- d Institute for Molecular Science, National Institutes of Natural Sciences , Okazaki , Japan
- e CREST, Japan Science and Technology Agency , Tokyo , Japan
| | - Christian Stemmle
- a Institut für Chemie und Biochemie, Freie Universität Berlin , Berlin , Germany
| |
Collapse
|
36
|
Trippel S, Mullins TG, Müller NL, Kienitz JS, Długołȩcki K, Küpper J. Strongly aligned and oriented molecular samples at a kHz repetition rate. Mol Phys 2013. [DOI: 10.1080/00268976.2013.780334] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | | | - Nele L.M. Müller
- a Center for Free-Electron Laser Science , DESY , Hamburg , Germany
| | - Jens S. Kienitz
- a Center for Free-Electron Laser Science , DESY , Hamburg , Germany
- b The Hamburg Center for Ultrafast Imaging , Hamburg , Germany
| | - Karol Długołȩcki
- a Center for Free-Electron Laser Science , DESY , Hamburg , Germany
| | - Jochen Küpper
- a Center for Free-Electron Laser Science , DESY , Hamburg , Germany
- b The Hamburg Center for Ultrafast Imaging , Hamburg , Germany
- c Department of Physics , University of Hamburg , Hamburg , Germany
| |
Collapse
|
37
|
Grohmann T, Manz J, Schild A. Effects of molecular symmetry on the directions of nuclear flux densities during tunnelling in double well potentials. Mol Phys 2013. [DOI: 10.1080/00268976.2013.800599] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Thomas Grohmann
- Institut für Chemie und Biochemie, Freie Universiät Berlin , Berlin, 14195, Germany
| | - Jörn Manz
- Institut für Chemie und Biochemie, Freie Universiät Berlin , Berlin, 14195, Germany
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University , Taiyuan, 030006, China
| | - Axel Schild
- Institut für Chemie und Biochemie, Freie Universiät Berlin , Berlin, 14195, Germany
| |
Collapse
|
38
|
LIU YONG, LI JIAN, YU JIE, CONG SHULIN. FIELD-FREE MOLECULAR ORIENTATION IN DISSIPATIVE MEDIA BY A COMBINATION OF FEMTOSECOND AND THz LASER PULSES. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633613500065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We present a theoretical scheme for achieving the field-free molecular orientation in dissipative media by a combination of femtosecond and THz laser pulses. Numerical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch model. The molecular orientation degree is sensitive to the carrier-envelope phase of the THz pulse and the delay time between the two pulses. The orientation and the rotational population of CO molecules in dissipative environment are computed at different pressures and temperatures. The influence of pure decoherence on the molecular orientation is also discussed.
Collapse
Affiliation(s)
- YONG LIU
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - JIAN LI
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - JIE YU
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - SHU-LIN CONG
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China
| |
Collapse
|
39
|
Arya U, Dahiya B, Prasad V. Pulse shape effect of delayed pulse on non-adiabatic rotational excitation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 95:491-496. [PMID: 22580143 DOI: 10.1016/j.saa.2012.04.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 03/20/2012] [Accepted: 04/07/2012] [Indexed: 05/31/2023]
Abstract
We examine the time evolution of Non-adiabatic excitation of polar molecule in static field exposed to a combination of delayed pulses. The delayed pulse pair consists of half cycle pulse (HCP) and an another delayed pulse (either ultrashort half cycle pulse or zero area pulse). We describe how Non-adiabatic rotational excitation (NAREX) due to Gaussian HCP pulse alone can be greatly modified by applying ultrashort HCP/zero area pulse. It is also shown that non-adiabatic rotational excitation can be controlled by various laser parameters, out of which pulse shape plays the most significant role for controlling the dynamics. Time dependent Schrödinger equation (TDSE) of NAREX dynamics, are studied using efficient fourth order Runge Kutta method.
Collapse
Affiliation(s)
- Urvashi Arya
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India.
| | | | | |
Collapse
|
40
|
Nakajima K, Abe H, Ohtsuki Y. Optimal Control Simulation of Field-Free Molecular Orientation: Alignment-Enhanced Molecular Orientation. J Phys Chem A 2012; 116:11219-27. [DOI: 10.1021/jp3052054] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Katsuhiro Nakajima
- Department of Chemistry, Graduate
School of Science, Tohoku University, Sendai
980-8578, Japan
| | - Hiroya Abe
- Department of Chemistry, Graduate
School of Science, Tohoku University, Sendai
980-8578, Japan
| | - Yukiyoshi Ohtsuki
- Department of Chemistry, Graduate
School of Science, Tohoku University, Sendai
980-8578, Japan
| |
Collapse
|
41
|
Lemeshko M, Friedrich B. Interaction between polar molecules subject to a far-off-resonant optical field: entangled dipoles up- or down-holding each other. Mol Phys 2012. [DOI: 10.1080/00268976.2012.689868] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
42
|
Moiseyev N, Gupta AK. Distinguishing between aligned and randomly oriented polar molecules by using a combination of strong laser field with a weak static field. Mol Phys 2012. [DOI: 10.1080/00268976.2012.674565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
43
|
Ortigoso J. Mechanism of molecular orientation by single-cycle pulses. J Chem Phys 2012; 137:044303. [DOI: 10.1063/1.4736844] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
|
44
|
Parker SM, Ratner MA, Seideman T. Coherent control of molecular torsion. J Chem Phys 2011; 135:224301. [DOI: 10.1063/1.3663710] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
|
45
|
Gershnabel E, Shapiro M, Averbukh IS. Stern-Gerlach deflection of field-free aligned paramagnetic molecules. J Chem Phys 2011; 135:194310. [DOI: 10.1063/1.3662135] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
46
|
Omiste JJ, González-Férez R, Schmelcher P. Rotational spectrum of asymmetric top molecules in combined static and laser fields. J Chem Phys 2011; 135:064310. [DOI: 10.1063/1.3624774] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
47
|
Minemoto S, Sakai H. Measuring polarizability anisotropies of rare gas diatomic molecules by laser-induced molecular alignment technique. J Chem Phys 2011; 134:214305. [DOI: 10.1063/1.3594681] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
48
|
Omiste JJ, Gärttner M, Schmelcher P, González-Férez R, Holmegaard L, Nielsen JH, Stapelfeldt H, Küpper J. Theoretical description of adiabatic laser alignment and mixed-field orientation: the need for a non-adiabatic model. Phys Chem Chem Phys 2011; 13:18815-24. [DOI: 10.1039/c1cp21195a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- J J Omiste
- Instituto Carlos I de Física Teórica y Computacional and Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Filsinger F, Meijer G, Stapelfeldt H, Chapman HN, Küpper J. State- and conformer-selected beams of aligned and oriented molecules for ultrafast diffraction studies. Phys Chem Chem Phys 2010; 13:2076-87. [PMID: 21165481 DOI: 10.1039/c0cp01585g] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The manipulation of the motion of neutral molecules with electric or magnetic fields has seen tremendous progress over the last decade. Recently, these techniques have been extended to the manipulation of large and complex molecules. In this article we introduce experimental approaches to the manipulation of large molecules, i.e., the deflection, focusing and deceleration using electric fields. We detail how these methods can be exploited to spatially separate quantum states and how to select individual conformers of complex molecules. We briefly describe mixed-field orientation experiments made possible by the quantum-state selection. Moreover, we provide an outlook on ultrafast diffraction experiments using these highly controlled samples.
Collapse
Affiliation(s)
- Frank Filsinger
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | | | | | | | | |
Collapse
|
50
|
Quantum Switching of Magnetic Fields by Circularly Polarized Re-Optimized π Laser Pulses: From One-Electron Atomic Ions to Molecules. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-3-642-15054-8_2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|