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Tuthill DR, Scarborough TD, Gorman TT, Hamer KA, Jones RR, Gaarde MB, Lopata K, Mauger F, Schafer KJ, DiMauro LF. Investigation of Interferences in Carbon Dioxide through Multidimensional Molecular-Frame High-Harmonic Spectroscopy. J Phys Chem A 2022; 126:8588-8595. [DOI: 10.1021/acs.jpca.2c04606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Daniel R. Tuthill
- Department of Physics, The Ohio State University, Columbus, Ohio43210, United States
| | | | - Timothy T. Gorman
- Department of Physics, The Ohio State University, Columbus, Ohio43210, United States
| | - Kyle A. Hamer
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Robert R. Jones
- Department of Physics, University of Virginia, Charlottesville, Virginia22904, United States
| | - Mette B. Gaarde
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Kenneth Lopata
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - François Mauger
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Kenneth J. Schafer
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Louis F. DiMauro
- Department of Physics, The Ohio State University, Columbus, Ohio43210, United States
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2
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Phase-matched high-order harmonic generation in pre-ionized noble gases. Sci Rep 2022; 12:7715. [PMID: 35546598 PMCID: PMC9095879 DOI: 10.1038/s41598-022-11313-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 04/21/2022] [Indexed: 11/17/2022] Open
Abstract
One of the main difficulties of efficiently generating high-order harmonics in long neutral-gas targets is to reach the phase-matching conditions. The issue is that the medium cannot be sufficiently ionized by the driving laser due to plasma defocusing. We propose a method to improve the phase-matching by pre-ionizing the gas using a weak capillary discharge. We have demonstrated this mechanism, for the first time, in absorption-limited XUV generation by an 800 nm femtosecond laser in argon and krypton. The ability to control phase-mismatch is confirmed by an analytical model and numerical simulations of the entire generation process. Our method allows to increase the efficiency of the harmonic generation significantly, paving the way towards photon-hungry applications of these compact short-wavelength sources.
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Influence of shape resonances on the angular dependence of molecular photoionization delays. Nat Commun 2021; 12:7343. [PMID: 34930902 PMCID: PMC8688504 DOI: 10.1038/s41467-021-27360-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 11/03/2021] [Indexed: 11/22/2022] Open
Abstract
Characterizing time delays in molecular photoionization as a function of the ejected electron emission direction relative to the orientation of the molecule and the light polarization axis provides unprecedented insights into the attosecond dynamics induced by extreme ultraviolet or X-ray one-photon absorption, including the role of electronic correlation and continuum resonant states. Here, we report completely resolved experimental and computational angular dependence of single-photon ionization delays in NO molecules across a shape resonance, relying on synchrotron radiation and time-independent ab initio calculations. The angle-dependent time delay variations of few hundreds of attoseconds, resulting from the interference of the resonant and non-resonant contributions to the dynamics of the ejected electron, are well described using a multichannel Fano model where the time delay of the resonant component is angle-independent. Comparing these results with the same resonance computed in e-NO+ scattering highlights the connection of photoionization delays with Wigner scattering time delays.
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Gorman TT, Scarborough TD, Abanador PM, Mauger F, Kiesewetter D, Sándor P, Khatri S, Lopata K, Schafer KJ, Agostini P, Gaarde MB, DiMauro LF. Probing the interplay between geometric and electronic-structure features via high-harmonic spectroscopy. J Chem Phys 2019; 150:184308. [DOI: 10.1063/1.5086036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- T. T. Gorman
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - T. D. Scarborough
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - P. M. Abanador
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - F. Mauger
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - D. Kiesewetter
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - P. Sándor
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - S. Khatri
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - K. Lopata
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - K. J. Schafer
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - P. Agostini
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - M. B. Gaarde
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - L. F. DiMauro
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
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5
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Stickler BA, Schrinski B, Hornberger K. Rotational Friction and Diffusion of Quantum Rotors. PHYSICAL REVIEW LETTERS 2018; 121:040401. [PMID: 30095961 DOI: 10.1103/physrevlett.121.040401] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 03/14/2018] [Indexed: 06/08/2023]
Abstract
We present the Markovian quantum master equation describing rotational decoherence, friction, diffusion, and thermalization of planar, linear, and asymmetric rotors in contact with a thermal environment. It describes how an arbitrary initial rotation state decoheres and evolves toward a Gibbs-like thermal ensemble, as we illustrate numerically for the linear and the planar top, and it yields the expected rotational Fokker-Planck equation of Brownian motion in the semiclassical limit.
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Affiliation(s)
- Benjamin A Stickler
- University of Duisburg-Essen, Faculty of Physics, Lotharstraße 1, 47048 Duisburg, Germany
| | - Björn Schrinski
- University of Duisburg-Essen, Faculty of Physics, Lotharstraße 1, 47048 Duisburg, Germany
| | - Klaus Hornberger
- University of Duisburg-Essen, Faculty of Physics, Lotharstraße 1, 47048 Duisburg, Germany
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