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Ertel D, Busto D, Makos I, Schmoll M, Benda J, Bragheri F, Osellame R, Lindroth E, Patchkovskii S, Mašín Z, Sansone G. Anisotropy Parameters for Two-Color Photoionization Phases in Randomly Oriented Molecules: Theory and Experiment in Methane and Deuteromethane. J Phys Chem A 2024; 128:1685-1697. [PMID: 38394372 PMCID: PMC10926910 DOI: 10.1021/acs.jpca.3c06759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 01/14/2024] [Accepted: 01/17/2024] [Indexed: 02/25/2024]
Abstract
We present combined theoretical and experimental work investigating the angle-resolved phases of the photoionization process driven by a two-color field consisting of an attosecond pulse train and an infrared pulse in an ensemble of randomly oriented molecules. We derive a general form for the two-color photoelectron (and time-delay) angular distribution valid also in the case of chiral molecules and when relative polarizations of the photons contributing to the attosecond photoelectron interferometer differ. We show a comparison between the experimental data and theoretical predictions in an ensemble of methane and deuteromethane molecules, discussing the effect of nuclear dynamics on the photoionization phases. Finally, we demonstrate that the oscillating component and the phase of the two-color signal can be fitted by using complex asymmetry parameters, in perfect analogy to the atomic case.
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Affiliation(s)
- Dominik Ertel
- Physikalisches
Institut, Albert-Ludwigs-Universität
Freiburg, Hermann-Herder-Straße
3, 79104 Freiburg, Germany
| | - David Busto
- Physikalisches
Institut, Albert-Ludwigs-Universität
Freiburg, Hermann-Herder-Straße
3, 79104 Freiburg, Germany
- Department
of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Ioannis Makos
- Physikalisches
Institut, Albert-Ludwigs-Universität
Freiburg, Hermann-Herder-Straße
3, 79104 Freiburg, Germany
| | - Marvin Schmoll
- Physikalisches
Institut, Albert-Ludwigs-Universität
Freiburg, Hermann-Herder-Straße
3, 79104 Freiburg, Germany
| | - Jakub Benda
- Institute
of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8, 180 00 Czech
Republic
| | | | | | - Eva Lindroth
- Department
of Physics, Stockholm University, AlbaNova
University Center, SE-106
91 Stockholm, Sweden
| | | | - Zdeněk Mašín
- Institute
of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8, 180 00 Czech
Republic
| | - Giuseppe Sansone
- Physikalisches
Institut, Albert-Ludwigs-Universität
Freiburg, Hermann-Herder-Straße
3, 79104 Freiburg, Germany
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Boyer A, Loriot V, Nandi S, Lépine F. Probing Photoionization Dynamics in Acetylene with Angle-Resolved Attosecond Interferometry. J Phys Chem A 2024; 128:840-847. [PMID: 38277696 DOI: 10.1021/acs.jpca.3c06533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2024]
Abstract
Photoionization of acetylene by extreme ultraviolet light results in a stand-alone contribution from the outermost valence orbital, followed by well-separated photoelectron bands from deeper molecular orbitals. This makes acetylene an ideal candidate for probing the photoionization dynamics in polyatomic molecules free from the spectral congestion often arising after interaction with an attosecond pulse train. Here, using an angle-resolved attosecond interferometric technique, we extract the photoionization time delays for the outermost valence orbital in acetylene relative to an atomic target, namely argon. Compared to argon, the photoemission from the acetylene molecule is found to be advanced by almost 28 attoseconds. The strong variation of the relative photoionization time delays as a function of the photoemission angle was interpreted using an analytical model based on semiclassical approximations to be the interplay between different short-range potentials along and perpendicular to the molecular axis. Our results highlight the importance of using attosecond time-resolved measurements to probe the nonspherical nature of the molecular potential, even in the case of relatively small, linear systems.
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Affiliation(s)
- Alexie Boyer
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne F-69622, France
| | - Vincent Loriot
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne F-69622, France
| | - Saikat Nandi
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne F-69622, France
| | - Franck Lépine
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne F-69622, France
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