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Fu Y, Wang B, Wang K, Tang X, Li B, Yin Z, Han J, Lin CD, Jin C. Controlling laser-dressed resonance line shape using attosecond extreme-ultraviolet pulse with a spectral minimum. Proc Natl Acad Sci U S A 2024; 121:e2307836121. [PMID: 38170749 PMCID: PMC10786267 DOI: 10.1073/pnas.2307836121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 12/01/2023] [Indexed: 01/05/2024] Open
Abstract
High-harmonic generation from a gas target exhibits sharp spectral features and rapid phase variation near the Cooper minimum. By applying spectral filtering, shaped isolated attosecond pulses can be generated where the pulse is split into two in the time domain. Using such shaped extreme-ultraviolet (XUV) pulses, we theoretically study attosecond transient absorption (ATA) spectra of helium [Formula: see text] autoionizing state which is resonantly coupled to the [Formula: see text] dark state by a time-delayed infrared laser. Our simulations show that the asymmetric [Formula: see text] Fano line shape can be readily tuned into symmetric Lorentzian within the time delay of a few tens of attoseconds. Such efficient control is due to the destructive interference in the generation of the [Formula: see text] state when it is excited by a strongly shaped XUV pulse. This is to be compared to prior experiments where tuning the line shape of a Fano resonance would take tens of femtoseconds. We also show that the predicted ATA spectral line shape can be observed experimentally after propagation in a gas medium. Our results suggest that strongly shaped attosecond XUV pulses offer the opportunity for controlling and probing fine features of narrow resonances on the few-ten attoseconds timescale.
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Affiliation(s)
- Yong Fu
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Bincheng Wang
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Kan Wang
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Xiangyu Tang
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Baochang Li
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Zhiming Yin
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - Jiaxin Han
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
| | - C. D. Lin
- Department of Physics, James R. Macdonald Laboratory, Kansas State University, Manhattan, KS66506
| | - Cheng Jin
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
- Ministry of Industry and Information Technology Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, China
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Triple ionization and fragmentation of benzene trimers following ultrafast intermolecular Coulombic decay. Nat Commun 2022; 13:5335. [PMID: 36088449 PMCID: PMC9464219 DOI: 10.1038/s41467-022-33032-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 08/25/2022] [Indexed: 11/25/2022] Open
Abstract
Intermolecular interactions involving aromatic rings are ubiquitous in biochemistry and they govern the properties of many organic materials. Nevertheless, our understanding of the structures and dynamics of aromatic clusters remains incomplete, in particular for systems beyond the dimers, despite their high presence in many macromolecular systems such as DNA and proteins. Here, we study the fragmentation dynamics of benzene trimer that represents a prototype of higher-order aromatic clusters. The trimers are initially ionized by electron-collision with the creation of a deep-lying carbon 2s−1 state or one outer-valence and one inner-valence vacancies at two separate molecules. The system can thus relax via ultrafast intermolecular decay mechanisms, leading to the formation of C\documentclass[12pt]{minimal}
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\begin{document}$${}_{6}{{{{{{{{{\rm{H}}}}}}}}}_{6}}^{+}$$\end{document}6H6+ trications and followed by a concerted three-body Coulomb explosion. Triple-coincidence ion momentum spectroscopy, accompanied by ab-initio calculations and further supported by strong-field laser experiments, allows us to elucidate the details on the fragmentation dynamics of benzene trimers. Higher-order aromatic clusters are prevalent in biochemical systems, but a full understanding of their structural and dynamical properties is lacking. Here, the authors demonstrate that inner-valence ionization can induce ultrafast relaxation and further fragmentation mechanisms in benzene trimers.
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Yu X, Zhang X, Hu X, Zhao X, Ren D, Li X, Ma P, Wang C, Wu Y, Luo S, Ding D. Femtosecond Time-Resolved Neighbor Roles in the Fragmentation Dynamics of Molecules in a Dimer. PHYSICAL REVIEW LETTERS 2022; 129:023001. [PMID: 35867441 DOI: 10.1103/physrevlett.129.023001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 04/07/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
How the neighbor effect plays its role in the fragmentation of molecular clusters attracts great attention for physicists and chemists. Here, we study this effect in the fragmentation of N_{2}O dimer by performing three-body coincidence measurements on the femtosecond timescale. Rotations of bound N_{2}O^{+} triggered by neutral or ionic neighbors are tracked. The forbidden dissociation path between B^{2}Π and ^{4}Π is opened by the spin-exchange effect due to the existence of neighbor ions, leading to a new channel of N_{2}O^{+}→NO+N^{+} originating from B^{2}Π. The formation and dissociation of the metastable product N_{3}O_{2}^{+} from two ion-molecule reaction channels are tracked in real time, and the corresponding trajectories are captured. Our results demonstrate a significant and promising step towards the understanding of neighbor roles in the reactions within clusters.
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Affiliation(s)
- Xitao 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
| | - Xinyu Zhang
- 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
| | - Xiaoqing Hu
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
| | - Xinning Zhao
- 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
| | - Dianxiang Ren
- 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
| | - Yong Wu
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
| | - 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
| | - 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
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Dissociative Ionization and Coulomb Explosion of CHBrCl2 in Intense Near-Infrared Femtosecond Laser Fields. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12105014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We experimentally demonstrate the dissociative photoionization of CHBrCl2 molecules in a femtosecond laser field by time-of-flight mass spectrum and dc-slice imaging technology. The results suggest that the low kinetic energy components are from the dissociative ionization process of single-charged molecular ions. The angular distribution of fragment Cl+ ions can be attributed to the features of dissociative state and molecular configuration, and that of Br+ ions results from the electronic wave-packet evolution and combination of the multi-dissociation processes. The high kinetic energy components are from the Coulomb explosion of multi-charged molecular ions, and the error of the C-Br distance involved in the Coulomb explosion can be explained by the movement of the effective charge center of the polyatomic molecule.
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