1
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Ghosh S, Pandey G, Tiwari AK. Efficient Control of Electron Localization and Probability Modulation with Synthesized Two-Color Intense Laser Pulses. J Phys Chem A 2024. [PMID: 39058686 DOI: 10.1021/acs.jpca.4c03416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
A coupled electron-nuclear dynamical study at attosecond time scale is performed on the HD+ and H2+ molecular ions under the influence of synthesized intense two-color electric fields. We have employed ω - 2ω and also, ω - 3ω two-color fields in the infrared/mid-infrared regime to study the different fragmentation processes originating from the interference of n - (n + i) (i = 1, 2) photon absorption pathways. The branching ratios corresponding to different photofragments are controlled by tuning the relative phase as well as intensity of the two-color pulses, while the effect of the initial nuclear wave function is also studied by taking an individual vibrational eigenstate or a coherent superposition of several eigenstates of HD+ and H2+. By comprehensive analysis, the efficacy of the two different types of synthesized two-color pulses (ω - 2ω and ω - 3ω) are analyzed with respect to one-color intense pulses in terms of controlling the probability modulation and electron localization asymmetry and compared with previous theoretical calculations and experimental findings. Through the detailed investigation, we have addressed which one is the major controlling knob to have better electron localization as well as probability modulation.
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Affiliation(s)
- Sandip Ghosh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, West Bengal 741246, India
| | - Gaurav Pandey
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, West Bengal 741246, India
- Theoretical Physical Chemistry, University of Liège, 4000 Liège, Belgium
| | - Ashwani K Tiwari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, West Bengal 741246, India
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2
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Pandey G, Ghosh S, Tiwari AK. Strong Laser Field-Driven Coupled Electron-Nuclear Dynamics: Quantum vs Classical Description. J Phys Chem A 2023; 127:9206-9219. [PMID: 37890168 DOI: 10.1021/acs.jpca.3c05047] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2023]
Abstract
We have performed a coupled electron-nuclear dynamics study of H2+ molecular ions under the influence of an intense few-cycle 4.5 fs laser pulse with an intensity of 4 × 1014 W/cm2 and a central wavelength of 750 nm. Both quantum and classical dynamical methods are employed in the exact similar initial conditions with the aim of head-to-head comparison of two methodologies. A competition between ionization and dissociation channel is explained under the framework of quantum and classical dynamics. The origin of the electron localization phenomena is elucidated by observing the molecular and electronic wave packet evolution pattern. By probing with different carrier envelope phase (CEP) values of the ultrashort pulse, the possibility of electron localization on either of the two nuclei is investigated. The effects of initial vibrational states on final dissociation and ionization probabilities for several CEP values are studied in detail. Finally, asymmetries in the dissociation probabilities are calculated and mutually compared for both quantum and classical dynamical methodologies, whereas Franck-Condon averaging over the initial vibrational states is carried out in order to mimic the existing experimental conditions.
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Affiliation(s)
- Gaurav Pandey
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Kolkata, West Bengal 741246, India
| | - Sandip Ghosh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Kolkata, West Bengal 741246, India
| | - Ashwani K Tiwari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Kolkata, West Bengal 741246, India
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3
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Tong J, Liu X, Dong W, Jiang W, Zhu M, Xu Y, Zuo Z, Lu P, Gong X, Song X, Yang W, Wu J. Probing Resonant Photoionization Time Delay by Self-Referenced Molecular Attoclock. PHYSICAL REVIEW LETTERS 2022; 129:173201. [PMID: 36332237 DOI: 10.1103/physrevlett.129.173201] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 03/28/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Attosecond time-resolved electron tunneling dynamics have been investigated by using attosecond angular streaking spectroscopy, where a clock reference to the laser field vector is required in atomic strong-field ionization and the situation becomes complicated in molecules. Here we reveal a resonant ionization process via a transient state by developing an electron-tunneling-site-resolved molecular attoclock in Ar-Kr^{+}. Two distinct deflection angles are observed in the photoelectron angular distribution in the molecular frame, corresponding to the direct and resonant ionization pathways. We find the electron is temporally trapped in the Coulomb potential wells of the Ar-Kr^{+} before finally releasing into the continuum when the electron tunnels through the internal barrier. By utilizing the direct tunneling ionization as a self-referenced arm of the attoclock, the time delay of the electron trapped in the resonant state is revealed to be 3.50±0.04 fs. Our results give an impetus to exploring the ultrafast electron dynamics in complex systems and also endow a semiclassical presentation of the electron trapping dynamics in a quantum resonant state.
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Affiliation(s)
- Jihong Tong
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Xiwang Liu
- School of Science and Center for Theoretical Physics, Hainan University, Haikou 570288, China
| | - Wenhui Dong
- Department of Physics, College of Science, Shantou University, Shantou, Guangdong 515063, China
| | - Wenyu Jiang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Ming Zhu
- School of Science and Center for Theoretical Physics, Hainan University, Haikou 570288, China
| | - Yidan Xu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Zitan Zuo
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Peifen Lu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Xiaochun Gong
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Xiaohong Song
- School of Science and Center for Theoretical Physics, Hainan University, Haikou 570288, China
| | - Weifeng Yang
- School of Science and Center for Theoretical Physics, Hainan University, Haikou 570288, China
| | - Jian Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
- Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401121, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
- CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
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4
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Stetzler J, Rassolov VA. Comparison of Born–Oppenheimer approximation and electron-nuclear correlation. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2106321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Julian Stetzler
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA
| | - Vitaly A. Rassolov
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA
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5
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Villaseco Arribas E, Agostini F, Maitra NT. Exact Factorization Adventures: A Promising Approach for Non-Bound States. Molecules 2022; 27:molecules27134002. [PMID: 35807246 PMCID: PMC9267945 DOI: 10.3390/molecules27134002] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/07/2022] [Accepted: 06/09/2022] [Indexed: 11/29/2022] Open
Abstract
Modeling the dynamics of non-bound states in molecules requires an accurate description of how electronic motion affects nuclear motion and vice-versa. The exact factorization (XF) approach offers a unique perspective, in that it provides potentials that act on the nuclear subsystem or electronic subsystem, which contain the effects of the coupling to the other subsystem in an exact way. We briefly review the various applications of the XF idea in different realms, and how features of these potentials aid in the interpretation of two different laser-driven dissociation mechanisms. We present a detailed study of the different ways the coupling terms in recently-developed XF-based mixed quantum-classical approximations are evaluated, where either truly coupled trajectories, or auxiliary trajectories that mimic the coupling are used, and discuss their effect in both a surface-hopping framework as well as the rigorously-derived coupled-trajectory mixed quantum-classical approach.
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Affiliation(s)
| | - Federica Agostini
- Institut de Chimie Physique UMR8000, Université Paris-Saclay, CNRS, 91405 Orsay, France;
| | - Neepa T. Maitra
- Department of Physics, Rutgers University, Newark, NJ 07102, USA;
- Correspondence:
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6
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Aebersold LE, Ulusoy IS, Wilson AK. Electron-nuclear quantum dynamics of diatomic molecules: nonadiabatic signatures in molecular spectra. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1988743] [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)
- Lucas E. Aebersold
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
| | - Inga S. Ulusoy
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
- Scientific Software Center, Interdisciplinary Center for Scientific Computing, Heidelberg University, Heidelberg, Germany
| | - Angela K. Wilson
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
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7
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8
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Voznyuk O, Jochim B, Zohrabi M, Broin A, Averin R, Carnes KD, Ben-Itzhak I, Wells E. Adaptive strong-field control of vibrational population in NO 2+. J Chem Phys 2019; 151:124310. [DOI: 10.1063/1.5115504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- O. Voznyuk
- Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA
| | - Bethany Jochim
- Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
| | - M. Zohrabi
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
| | - Adam Broin
- Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA
| | - R. Averin
- Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA
| | - K. D. Carnes
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
| | - I. Ben-Itzhak
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
| | - E. Wells
- Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA
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9
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Monfared M, Irani E, Sadighi-Bonabi R. Controlling the multi-electron dynamics in the high harmonic spectrum from N 2O molecule using TDDFT. J Chem Phys 2018; 148:234303. [PMID: 29935508 DOI: 10.1063/1.5025155] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
In this study, high harmonic generation from a multi-atomic nitrous oxide molecule was investigated. A comprehensive three-dimensional calculation of the molecular dynamics and electron trajectories through an accurate time-dependent density functional theory was conducted to efficiently explore a broad harmonic plateau. The effects of multi-electron and inner orbitals on the harmonic spectrum and generated coherent attosecond pulses were analyzed. The role of the valence electrons in controlling the process and extending the harmonic plateau was investigated. The main issue of producing a super-continuum harmonic spectrum via a frequency shift was considered. The time-frequency representation by means of a wavelet transform of the induced dipole acceleration provided a good insight into the distorted effects from the nonlinear processes in high harmonic emission. The effect of the chirped laser pulse on the production of broadband amplitude was justified in this model. By adjusting the optimal laser parameters to an input intensity of 2.5 × 1014 W cm-2, an isolated 68 as pulse was generated.
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Affiliation(s)
- M Monfared
- Department of Physics, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran
| | - E Irani
- Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - R Sadighi-Bonabi
- Department of Physics, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran
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10
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Yue S, Fu S, Li J, Zhang X, Feng Y, Hu B, Du H. A redshift mechanism of high-order harmonics: Change of ionization energy. J Chem Phys 2018; 148:234304. [PMID: 29935501 DOI: 10.1063/1.5031210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We theoretically study the high-order harmonic generation of H2+ and its isotopes beyond the Born-Oppenheimer dynamics. It is surprising that the spectral redshift can still be observed in high harmonic spectra of H2+ driven by a sinusoidal laser pulse in which the trailing (leading) edge of the laser pulse is nonexistent. The results confirm that this spectral redshift originates from the reduction in ionization energy between recombination time and ionization time, which is obviously different from the nonadiabatic spectral redshift induced by the falling edge of the laser pulse. Additionally, the improved instantaneous frequency of harmonics by considering the changeable ionization energy can deeply verify our results. Therefore, this new mechanism must be taken into account when one uses the nonadiabatic spectral redshift to retrieve the nuclear motion.
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Affiliation(s)
- Shengjun Yue
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Silin Fu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Jinbin Li
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Xiao Zhang
- Center for Interdisciplinary Studies and Key Laboratory for Magnetism and Magnetic Materials of the MoE, Lanzhou University, Lanzhou 730000, China
| | - Yongkang Feng
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Bitao Hu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Hongchuan Du
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
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11
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12
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Li MZ, Jia GR, Bian XB. Alignment dependent ultrafast electron-nuclear dynamics in molecular high-order harmonic generation. J Chem Phys 2017; 146:084305. [PMID: 28249424 DOI: 10.1063/1.4976973] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigated the high-order harmonic generation (HHG) process of diatomic molecular ion H2+ in non-Born-Oppenheimer approximations (NBOA). The corresponding three-dimensional time-dependent Schrödinger equation is solved with arbitrary alignment angles. It is found that the nuclear motion can lead to spectral modulation of HHG in both the tunneling and multiphoton ionization regimes. The universal redshifts of the whole spectrum are unique in molecular HHG. The spectral width of HHG increases in NBOA. We calculated possible influences on redshifts of HHG in real experimental conditions and found that redshifts decrease with the increase of alignment angles of the molecules and are sensitive to the initial vibrational states. It can be used to extract the ultrafast electron-nuclear dynamics and image molecular structure. It will be instructive to related experiments.
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Affiliation(s)
- Mu-Zi Li
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Guang-Rui Jia
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xue-Bin Bian
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
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13
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Dissociation and Ionization of Quasi-Periodically Vibrating H 2+ in Intense Few-Cycle Mid-Infrared Laser Fields. Sci Rep 2017; 7:42086. [PMID: 28165034 PMCID: PMC5292692 DOI: 10.1038/srep42086] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/05/2017] [Indexed: 01/12/2023] Open
Abstract
Using quantum mechanics calculations, we theoretically study the dissociation and ionization dynamics of the hydrogen-molecule ion in strong laser fields. Having prepared the nuclear wave packet of H2+ in a specific vibrational state, a pump laser is used to produce a vibrational excitation, leading to quasi-periodical vibration without ionization. Then, a time-delayed few-cycle laser is applied to trigger the dissociation or ionization of H2+. Both the time delay and the intensity of the probe laser alter the competition between dissociation and ionization. We also explore the dependence of kinetic-energy release spectra of fragments on the time delay, showing that the channels of above-threshold dissociation and below-threshold dissociation are opened and closed periodically. Also, dissociation from different channels is influenced by nuclear motion. The dissociation mechanism has been described in detail using the Floquet picture. This work provides a useful method for steering the electronic and nuclear dynamics of diatomic molecules in intense laser fields.
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14
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Tóth A, Borbély S, Kiss GZ, Halász GJ, Vibók Á. Toward the Full Quantum Dynamical Description of Photon Induced Processes in D 2. J Phys Chem A 2016; 120:9411-9421. [PMID: 27934332 DOI: 10.1021/acs.jpca.6b09623] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dissociative ionization (multiphoton regime) of the D2+ ion by ultrashort laser pulses has been studied theoretically using ab initio calculations. The combined ionization and dissociation spectrum was explored for fixed molecular axis orientations. In accordance with previous investigations, the dominant features in the obtained joint energy spectrum were multiphoton peaks. In addition to this, in the present work, photoelectron angular distributions were analyzed as well. By performing a partial wave analysis for each multiphoton peak, we have identified the number of absorbed photons. Moreover, we also found that the angular distribution can significantly change inside a multiphoton peak as a function of electron and nuclear kinetic energy.
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Affiliation(s)
- A Tóth
- Department of Theoretical Physics, University of Debrecen , PO Box 5, H-4010 Debrecen, Hungary
| | - S Borbély
- Faculty of Physics, Babeş-Bolyai University , Kogălniceanu Street 1, 400084 Cluj Napoca, Romania
| | - G Zs Kiss
- Faculty of Physics, Babeş-Bolyai University , Kogălniceanu Street 1, 400084 Cluj Napoca, Romania
| | - G J Halász
- Department of Information Technology, University of Debrecen , PO Box 12, H-4010 Debrecen, Hungary
| | - Á Vibók
- Department of Theoretical Physics, University of Debrecen , PO Box 5, H-4010 Debrecen, Hungary.,ELI-ALPS, ELI-HU Non-Profit Ltd , Dugonics tér 13, H-6720 Szeged, Hungary
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15
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Dey D, Tiwari AK. Coupled Electron-Nuclear Dynamics on H 2+ within Time-Dependent Born-Oppenheimer Approximation. J Phys Chem A 2016; 120:8259-8266. [PMID: 27690436 DOI: 10.1021/acs.jpca.6b09004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Quantum dynamical behavior of H2+ in the presence of a linearly polarized, ultrashort, intense, infrared laser pulse has been studied by numerically solving the time-dependent Schrödinger equation with nuclear motion restricted in one-dimension along the direction of laser polarization and electronic motion in three-dimensions. On the basis of the time-dependent Born-Oppenheimer approximation, we have constructed time-dependent potentials for the ground electronic state (1sσg) of H2+. Subsequent nuclear dynamics is then carried out on these field-dressed potential energy surfaces, and the dissociation dynamics is investigated. Our analyses reveal that although the electronic longitudinal degree of freedom plays the major role in governing the dissociation dynamics, contributions from the electronic transverse degree of freedom should also have to be taken into account to obtain accurate results. Also, modeling electron-nuclei Coulomb interactions in a one-dimensional calculation with an artificially chosen constant softening parameter leads to a discrepancy with the exact results. Comparing our results with other quantum and classical dynamical studies showed a good agreement with exact results.
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Affiliation(s)
- Diptesh Dey
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Ashwani K Tiwari
- Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
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16
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Csehi A, Halász GJ, Cederbaum LS, Vibók Á. Tracking the photodissociation probability of D2+ induced by linearly chirped laser pulses. J Chem Phys 2016; 144:074309. [DOI: 10.1063/1.4941847] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Paramonov GK, Kühn O, Bandrauk AD. Shaped Post-Field Electronic Oscillations in H2+ Excited by Two-Cycle Laser Pulses: Three-Dimensional Non-Born–Oppenheimer Simulations. J Phys Chem A 2016; 120:3175-85. [DOI: 10.1021/acs.jpca.5b11599] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guennaddi K. Paramonov
- Institut
für Physik, Universität Rostock, Albert-Einstein-Strasse 23-24, D-18059 Rostock, Germany
- Institut
für Chemie, Universität Potsdam, Karl-Liebknecht Strasse 24-25, 14476 Potsdam, Germany
| | - O. Kühn
- Institut
für Physik, Universität Rostock, Albert-Einstein-Strasse 23-24, D-18059 Rostock, Germany
| | - André D. Bandrauk
- Laboratorie
de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
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18
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Sharma P, Das S, Vatsa RK. Role of electron heating in efficient interaction of a nanosecond laser with the cluster media: a case study on tetrahydrofuran cluster system. RSC Adv 2016. [DOI: 10.1039/c6ra14226e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Interaction of tetrahydrofuran clusters with nanosecond laser pulses has been investigated at 532 and 1064 nm, using a time-of-flight mass spectrometer and home-built electron analyzer setup.
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Affiliation(s)
- Pramod Sharma
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Soumitra Das
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Rajesh K. Vatsa
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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19
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Halász GJ, Csehi A, Vibók Á. Photodissociation dynamics of the $$\hbox {D}_{2}^{+}$$ D 2 + ion initiated by several different laser pulses. Theor Chem Acc 2015. [DOI: 10.1007/s00214-015-1745-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Csehi A, Halász GJ, Cederbaum LS, Vibók Á. Photodissociation of D2+ induced by linearly chirped laser pulses. J Chem Phys 2015; 143:014305. [PMID: 26156481 DOI: 10.1063/1.4923441] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- András Csehi
- Department of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
| | - Gábor J Halász
- Department of Information Technology, University of Debrecen, P.O. Box 12, H-4010 Debrecen, Hungary
| | - Lorenz S Cederbaum
- Theoretische Chemie, Physikalish-Chemisches Institut, Universität Heidelberg, H-69120 Heidelberg, Germany
| | - Ágnes Vibók
- Department of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
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21
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Halász GJ, Vibók Á, Cederbaum LS. Direct Signature of Light-Induced Conical Intersections in Diatomics. J Phys Chem Lett 2015; 6:348-54. [PMID: 26261946 DOI: 10.1021/jz502468d] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nonadiabatic effects are ubiquitous in physics, chemistry, and biology. They are strongly amplified by conical intersections (CIs), which are degeneracies between electronic states of triatomic or larger molecules. A few years ago it was revealed that CIs in molecular systems can be formed by laser light, even in diatomics. Because of the prevailing strong nonadiabatic couplings, the existence of such laser-induced conical intersections (LICIs) may considerably change the dynamical behavior of molecular systems. By analyzing the photodissociation process of the D2+ molecule carefully, we found a robust effect in the angular distribution of the photofragments that serves as a direct signature of the LICI, providing undoubted evidence of its existence.
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Affiliation(s)
- G J Halász
- †Department of Information Technology, University of Debrecen, P.O. Box 12, H-4010 Debrecen, Hungary
| | - Á Vibók
- ‡Department of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
| | - L S Cederbaum
- §Theoretische Chemie, Physikalish-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
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22
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Bian XB, Bandrauk AD. Probing nuclear motion by frequency modulation of molecular high-order harmonic generation. PHYSICAL REVIEW LETTERS 2014; 113:193901. [PMID: 25415907 DOI: 10.1103/physrevlett.113.193901] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Indexed: 06/04/2023]
Abstract
Molecular high-order harmonic generation (MHOHG) in a non-Born-Oppenheimer treatment of H(2)(+), D(2)(+), is investigated by numerical simulations of the corresponding time-dependent Schrödinger equations in full dimensions. As opposed to previous studies on amplitude modulation of intracycle dynamics in MHOHG, we demonstrate redshifts as frequency modulation (FM) of intercycle dynamics in MHOHG. The FM is induced by nuclear motion using intense laser pulses. Compared to fixed-nuclei approximations, the intensity of MHOHG is much higher due to the dependence of enhanced ionization on the internuclear distance. The width and symmetry of the spectrum of each harmonic in MHOHG encode rich information on the dissociation process of molecules at the rising and falling parts of the laser pulses, which can be used to retrieve the nuclear dynamics. Isotope effects are studied to confirm the FM mechanism.
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Affiliation(s)
- Xue-Bin Bian
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
| | - André D Bandrauk
- Laboratoire de chimie théorique, Département de Chimie, Université de Sherbrooke, Sherbrooke, Quebéc J1K 2R1, Canada
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Halász GJ, Csehi A, Vibók Á, Cederbaum LS. Influence of Light-Induced Conical Intersection on the Photodissociation Dynamics of D2+ Starting from Individual Vibrational Levels. J Phys Chem A 2014; 118:11908-15. [DOI: 10.1021/jp504889e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gábor J. Halász
- Department
of Information Technology, University of Debrecen, P.O. Box 12, H-4010 Debrecen, Hungary
| | - András Csehi
- Department
of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
| | - Ágnes Vibók
- Department
of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
| | - Lorenz S. Cederbaum
- Theoretische
Chemie, Physikalish-Chemisches Institut, Universität Heidelberg, H-69120 Heidelberg, Germany
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24
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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
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25
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Kling MF, von den Hoff P, Znakovskaya I, de Vivie-Riedle R. (Sub-)femtosecond control of molecular reactions via tailoring the electric field of light. Phys Chem Chem Phys 2013; 15:9448-67. [DOI: 10.1039/c3cp50591j] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Falge M, Engel V, Lein M, Vindel-Zandbergen P, Chang BY, Sola IR. Quantum wave-packet dynamics in spin-coupled vibronic states. J Phys Chem A 2012; 116:11427-33. [PMID: 22946899 DOI: 10.1021/jp306566x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Extending the Shin-Metiu two-electron Hamiltonian, we construct a new Hamiltonian with effective singlet-triplet couplings. The Born-Oppenheimer electronic potentials and couplings are obtained for different parameters, and the laser-free dynamics is calculated with the full Hamiltonian and in the adiabatic limit. We compare the dynamics of the system using nuclear wave packets for different numbers of Born-Oppenheimer potentials and vibronic wave packets on a full 3-dimensional (two electron coordinates plus one nuclear coordinate) grid. Using strong fields, we show that it is possible to dynamically lock the spin state of the system by decoupling the singlet-triplet transition via a nonresonant dynamic Stark effect in the adiabatic limit. Although a similar spin-locking mechanism is observed in the dynamics of vibronic wave packets, multiphoton ionization cannot be neglected leading to the breakdown of the control scheme.
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Affiliation(s)
- Mirjam Falge
- Institut für Physikalische und Theoretische Chemie and Röntgen Research Center for Complex Material Systems Campus Nord, Universität Würzburg, Emil-Fischer-Straße 42, 97074 Würzburg, Germany
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27
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Madsen CB, Anis F, Madsen LB, Esry BD. Multiphoton above threshold effects in strong-field fragmentation. PHYSICAL REVIEW LETTERS 2012; 109:163003. [PMID: 23215075 DOI: 10.1103/physrevlett.109.163003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Indexed: 06/01/2023]
Abstract
We present a study of multiphoton dissociative ionization from molecules. By solving the time-dependent Schrödinger equation for H(2)(+) and projecting the solution onto double continuum scattering states, we observe the correlated electron-nuclear ionization dynamics in detail. We show-for the first time-how multiphoton structure prevails as long as one accounts for the energies of all the fragments. Our current work provides a new avenue to analyze strong-field fragmentation that leads to a deeper understanding of the correlated molecular dynamics.
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Affiliation(s)
- C B Madsen
- Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
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28
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Paramonov GK, Kühn O. State-Selective Vibrational Excitation and Dissociation of H2+ by Strong Infrared Laser Pulses: Below-Resonant versus Resonant Laser Fields and Electron–Field Following. J Phys Chem A 2012; 116:11388-97. [DOI: 10.1021/jp3060679] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | - Oliver Kühn
- Institut für Physik, Universität Rostock, D-18051 Rostock, Germany
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29
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He HX, Lu RF, Zhang PY, Han KL, He GZ. Dissociation and ionization competing processes for H2+ in intense laser field: Which one is larger? J Chem Phys 2012; 136:024311. [DOI: 10.1063/1.3676065] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Hai-Xiang He
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
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30
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YUAN KAIJUN, SUN ZHIGANG, CONG SHULIN, LOU NANQUAN. THE APPLICATION OF BESSEL DISCRETE VARIABLE REPRESENTATION TO ATOMIC HYDROGEN IN INTENSE LASER FIELDS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633607003477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The Bessel discrete variable representation (DVR) method is tested to describe the interaction of atomic hydrogen with intense laser fields by numerically solving the time-dependent Schrödinger equation. Using the Bessel functions of the first kind, the singular terms, r-2 or r-1 at the origin, in the kinetic energy operators are analytically solved. As an illustration example, the high-order harmonic generation (HOHG) spectra in atomic hydrogen is calculated in length and acceleration forms. From the numerical results, it is concluded that this simple Bessel DVR may be a useful method for describing the interaction of atomic hydrogen with intense laser fields.
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Affiliation(s)
- KAI-JUN YUAN
- Department of Physics, Dalian University of Technology, Dalian 116024, China
| | - ZHIGANG SUN
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616, Singapore
| | - SHU-LIN CONG
- Department of Physics, Dalian University of Technology, Dalian 116024, China
| | - NANQUAN LOU
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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31
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Yonehara T, Hanasaki K, Takatsuka K. Fundamental Approaches to Nonadiabaticity: Toward a Chemical Theory beyond the Born–Oppenheimer Paradigm. Chem Rev 2011; 112:499-542. [DOI: 10.1021/cr200096s] [Citation(s) in RCA: 154] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takehiro Yonehara
- Department of Basic Sciences, Graduate School of Arts and Sciences, The University of Tokyo Komaba, 153-8902 Tokyo, Japan
| | - Kota Hanasaki
- Department of Basic Sciences, Graduate School of Arts and Sciences, The University of Tokyo Komaba, 153-8902 Tokyo, Japan
| | - Kazuo Takatsuka
- Department of Basic Sciences, Graduate School of Arts and Sciences, The University of Tokyo Komaba, 153-8902 Tokyo, Japan
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32
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Lötstedt E, Kato T, Yamanouchi K. Classical dynamics of laser-driven D₃⁺. PHYSICAL REVIEW LETTERS 2011; 106:203001. [PMID: 21668225 DOI: 10.1103/physrevlett.106.203001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Indexed: 05/30/2023]
Abstract
A classical model of the triatomic D₃⁺ molecule subjected to an intense, few-cycle laser pulse is introduced. The model is capable of describing the laser-induced correlated motion of both electrons and nuclei in three dimensions, and allows us to follow the motion of the two electrons and three deuterons from the initial field-free state, during the pulse, and until the bond breaking into the final fragments. By averaging over many trajectories, we calculate the relative yields of the ionization and dissociation channels, as well as the kinetic energy release (KER) from the fragment ions. A comparison with recent experimental KER spectra shows good qualitative agreement. In addition, we find a pathway in which an emitted electron recombines into a high-lying Rydberg state, resulting in D + D⁺ + D⁺ fragments with the same KER as in the D⁺ + D⁺ + D⁺ channel.
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Affiliation(s)
- Erik Lötstedt
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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33
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Li Y, Jiang W, Khait YG, Hoffmann MR. Theoretical study of the photodissociation of Li(2)+ in one-color intense laser fields. J Chem Phys 2011; 134:174108. [PMID: 21548674 DOI: 10.1063/1.3585645] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theoretical treatment of the photodissociation of the molecular ion Li(2) (+) in one-color intense laser fields, using the time-dependent wave packet approach in a Floquet Born-Oppenheimer representation, is presented. Six electronic states 1,2 (2)Σ(g)(+), 1,2 (2)Σ(u)(+), 1 (2)Π(g), and 1 (2)Π(u) are of relevance in this simulation and have been included. The dependences of the fragmental dissociation probabilities and kinetic energy release (KER) spectra on pulse width, peak intensity, polarization angle, wavelength, and initial vibrational level are analyzed to interpret the influence of control parameters of the external field. Three main dissociation channels, 1 (2)Σ(g)(+) (m = -1), 2 (2)Σ(g)(+) (m = -2), and 2 (2)Σ(u)(+) (m = -3), are seen to dominate the dissociation processes under a wide variety of laser conditions and give rise to well separated groups of KER features. Different dissociation mechanisms for the involved Floquet channels are discussed.
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Affiliation(s)
- Yuanjun Li
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
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34
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Sonk JA, Caricato M, Schlegel HB. TD-CI Simulation of the Electronic Optical Response of Molecules in Intense Fields: Comparison of RPA, CIS, CIS(D), and EOM-CCSD. J Phys Chem A 2011; 115:4678-90. [DOI: 10.1021/jp107384p] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jason A. Sonk
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Marco Caricato
- Gaussian, Inc., 340 Quinnipiac Street, Building 40, Wallingford, Connecticut 06492, United States
| | - H. Bernhard Schlegel
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
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35
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Takemoto N, Becker A. Visualization and interpretation of attosecond electron dynamics in laser-driven hydrogen molecular ion using Bohmian trajectories. J Chem Phys 2011; 134:074309. [DOI: 10.1063/1.3553178] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Abedi A, Maitra NT, Gross EKU. Exact factorization of the time-dependent electron-nuclear wave function. PHYSICAL REVIEW LETTERS 2010; 105:123002. [PMID: 20867633 DOI: 10.1103/physrevlett.105.123002] [Citation(s) in RCA: 233] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Indexed: 05/26/2023]
Abstract
We present an exact decomposition of the complete wave function for a system of nuclei and electrons evolving in a time-dependent external potential. We derive formally exact equations for the nuclear and electronic wave functions that lead to rigorous definitions of a time-dependent potential energy surface (TDPES) and a time-dependent geometric phase. For the H(2)(+) molecular ion exposed to a laser field, the TDPES proves to be a useful interpretive tool to identify different mechanisms of dissociation.
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Affiliation(s)
- Ali Abedi
- Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
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37
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Atabek O, Lefebvre R, Nguyen-Dang T. Unstable States in Laser Assisted and Controlled Molecular Processes. ADVANCES IN QUANTUM CHEMISTRY 2010. [DOI: 10.1016/s0065-3276(10)60002-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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39
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Paul AK, Adhikari S, Mukhopadhyay D, Halász GJ, Vibók A, Baer R, Baer M. Photodissociation of H2(+) upon exposure to an intense pulsed photonic Fock state. J Phys Chem A 2009; 113:7331-7. [PMID: 19552475 DOI: 10.1021/jp811269g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Producing and controlling nonclassical light states are now the subject of intense experimental efforts. In this paper we consider the interaction of such a light state with a small molecule. Specifically, we develop the theory and apply it numerically to calculate in detail how a short pulse of nonclassical light, such as the high intensity Fock state, induces photodissociation in H(2)(+). We compare the kinetic energy distributions and photodissociation yields with the analogous results of quasi-classical light, namely a coherent state. We find that Fock-state light decreases the overall probability of dissociation for low vibrational states of H(2)(+) as well as the location of peaks and line shapes in the kinetic energy distribution of the nuclei.
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Affiliation(s)
- Amit K Paul
- Department of Physical Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
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40
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Hajgató B, Deleuze MS, Morini F. Probing Nuclear Dynamics in Momentum Space: A New Interpretation of (e, 2e) Electron Impact Ionization Experiments on Ethanol. J Phys Chem A 2009; 113:7138-54. [DOI: 10.1021/jp9027029] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Balázs Hajgató
- Research Group of Theoretical Chemistry, Department SBG, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium, and Eenheid Algemene Chemie, Vrije Universiteit Brussel, Faculteit Wetenschappen, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Michael S. Deleuze
- Research Group of Theoretical Chemistry, Department SBG, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium, and Eenheid Algemene Chemie, Vrije Universiteit Brussel, Faculteit Wetenschappen, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Filippo Morini
- Research Group of Theoretical Chemistry, Department SBG, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium, and Eenheid Algemene Chemie, Vrije Universiteit Brussel, Faculteit Wetenschappen, Pleinlaan 2, B-1050 Brussels, Belgium
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41
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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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42
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Christov IP. Molecular dynamics with time dependent quantum Monte Carlo. J Chem Phys 2008; 129:214107. [DOI: 10.1063/1.3031214] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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43
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Yuan S, Wu WF, Dou Y, Zhao JS. Trans–cis photoisomerization of azobenzene by n→π* excitation: A semiclassical dynamics study. CHINESE CHEM LETT 2008. [DOI: 10.1016/j.cclet.2008.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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44
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Lu RF, Zhang PY, Han KL. Attosecond-resolution quantum dynamics calculations for atoms and molecules in strong laser fields. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:066701. [PMID: 18643391 DOI: 10.1103/physreve.77.066701] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 02/28/2008] [Indexed: 05/26/2023]
Abstract
A parallel quantum electron and nuclei wave packet computer code, LZH-DICP, has been developed to study laser-atom-molecule interaction in the nonperturbative regime with attosecond resolution. The nonlinear phenomena occurring in that regime can be studied with the code in a rigorous way by numerically solving the time-dependent Schrödinger equation of electrons and nuclei. Time propagation of the wave functions is performed using a split-operator approach, and based on a sine discrete variable representation. Photoelectron spectra for hydrogen and kinetic-energy spectra for molecular hydrogen ion in linearly polarized laser fields are calculated using a flux operator scheme, which testifies to the validity and the high efficiency of LZH-DICP.
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Affiliation(s)
- Rui-Feng Lu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
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45
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Cederbaum LS. Born–Oppenheimer approximation and beyond for time-dependent electronic processes. J Chem Phys 2008; 128:124101. [DOI: 10.1063/1.2895043] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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46
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Vibrational excitation of simple molecular ions in resonant and under-resonant strong laser fields: Dissociation and ionization of ppe and pde; laser-enhanced nuclear fusion in ddμ and dtμ. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.04.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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47
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Yagi K, Takatsuka K. Nonadiabatic chemical dynamics in an intense laser field: electronic wave packet coupled with classical nuclear motions. J Chem Phys 2007; 123:224103. [PMID: 16375466 DOI: 10.1063/1.2130335] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dynamics of molecules in an intense laser field is studied in terms of the quantum electronic wave packet coupled with classical nuclear motions. The equations of motion are derived taking a proper account of molecular interactions with the vector potential of a classical electromagnetic field, along with the nonadiabatic interaction due to the breakdown of the Born-Oppenheimer approximation. With the aid of electronic structure calculations, the present method enables us to track, in an ab initio manner, the dynamics of polyatomic molecules in an intense field. Preliminary calculations are carried out for the vibrational state of LiF and a collision of Li+F under an intense laser pulse, which are limited to the domain of no ionization.
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Affiliation(s)
- Kiyoshi Yagi
- Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, Komaba, 153-8902 Tokyo, Japan.
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48
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Schlegel HB, Smith SM, Li X. Electronic optical response of molecules in intense fields: Comparison of TD-HF, TD-CIS, and TD-CIS(D) approaches. J Chem Phys 2007; 126:244110. [PMID: 17614540 DOI: 10.1063/1.2743982] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Time-dependent Hartree-Fock (TD-HF) and time-dependent configuration interaction (TD-CI) methods with Gaussian basis sets have been compared in modeling the response of hydrogen molecule, butadiene, and hexatriene exposed to very short, intense laser pulses (760 nm, 3 cycles). After the electric field of the pulse returns to zero, the molecular dipole continues to oscillate due to the coherent superposition of excited states resulting from the nonadiabatic excitation caused by the pulse. The Fourier transform of this residual dipole gives a measure of the nonadiabatic excitation. For low fields, only the lowest excited states are populated, and TD-CI simulations using singly excited states with and without perturbative corrections for double excitations [TD-CIS(D) and TD-CIS, respectively] are generally in good agreement with the TD-HF simulations. At higher field strengths, higher states are populated and the methods begin to differ significantly if the coefficients of the excited states become larger than approximately 0.1. The response of individual excited states does not grow linearly with intensity because of excited state to excited state transitions. Beyond a threshold in the field strength, there is a rapid increase in the population of many higher excited states, possibly signaling an approach to ionization. However, without continuum functions, the present TD-HF and TD-CI calculations cannot model ionization directly. The TD-HF and TD-CIS simulations are in good accord because the excitation energies obtained by linear response TD-HF [also known as random phase approximation (RPA)] agree very well with those obtained from singly excited configuration interaction (CIS) calculations. Because CIS excitation energies with the perturbative doubles corrections [CIS(D)] are on average lower than the CIS excitation energies, the TD-CIS(D) response is generally stronger than TD-CIS.
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Affiliation(s)
- H Bernhard Schlegel
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
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