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Mhamdi A, Rist J, Aslitürk D, Weller M, Melzer N, Trabert D, Kircher M, Vela-Pérez I, Siebert J, Eckart S, Grundmann S, Kastirke G, Waitz M, Khan A, Schöffler MS, Trinter F, Dörner R, Jahnke T, Demekhin PV. Breakdown of the Spectator Concept in Low-Electron-Energy Resonant Decay Processes. PHYSICAL REVIEW LETTERS 2018; 121:243002. [PMID: 30608769 DOI: 10.1103/physrevlett.121.243002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Indexed: 06/09/2023]
Abstract
We suggest that low-energy electrons, released by resonant decay processes, experience substantial scattering on the electron density of excited electrons, which remain a spectator during the decay. As a result, the angular emission distribution is altered significantly. This effect is expected to be a common feature of low-energy secondary electron emission. In this Letter, we exemplify our idea by examining the spectator resonant interatomic Coulombic decay of Ne dimers. Our theoretical predictions are confirmed by a corresponding coincidence experiment.
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Affiliation(s)
- A Mhamdi
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - J Rist
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - D Aslitürk
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - M Weller
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - N Melzer
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - D Trabert
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - M Kircher
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - I Vela-Pérez
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - J Siebert
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - S Eckart
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - S Grundmann
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - G Kastirke
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - M Waitz
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - A Khan
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - M S Schöffler
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - F Trinter
- Deutsches Elektronen-Synchrotron (DESY), FS-PE, Notkestrasse 85, 22607 Hamburg, Germany
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Molecular Physics, Faradayweg 4, 14195 Berlin, Germany
| | - R Dörner
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - T Jahnke
- Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
| | - Ph V Demekhin
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
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Pitzer M, Schmidt P, Ozga C, Hans A, Reiß P, Petrov ID, Artemyev AN, Ehresmann A, Knie A, Demekhin PV. Circular Dichroism in Fluorescence Emission Following the C 1s→π* Excitation and Resonant Auger Decay of Carbon Monoxide. Molecules 2018; 23:molecules23071534. [PMID: 29949868 PMCID: PMC6100420 DOI: 10.3390/molecules23071534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/14/2018] [Accepted: 06/21/2018] [Indexed: 11/26/2022] Open
Abstract
Dichroism in angle-resolved spectra of circularly polarized fluorescence from freely-rotating CO molecules was studied experimentally and theoretically. For this purpose, carbon monoxide in the gas phase was exposed to circularly polarized soft X-ray synchrotron radiation. The photon energy was tuned across the C 1s→π* resonant excitation, which decayed via the participator Auger transition into the CO+ A 2Π state. The dichroic parameter β1 of the subsequent CO+ (A 2Π → X 2Σ+) visible fluorescence was measured by photon-induced fluorescence spectroscopy. Present experimental results are explained with the ab initio electronic structure and dynamics calculations performed by the single center method. Our results confirm the possibility to perform partial wave analysis of the emitted photoelectrons in closed-shell molecules.
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Affiliation(s)
- Martin Pitzer
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Philipp Schmidt
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Christian Ozga
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Andreas Hans
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Philipp Reiß
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Ivan D Petrov
- Rostov State Transport University, Narodnogo Opolcheniya Square 2, 344038 Rostov-on-Don, Russia.
- Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia.
| | - Anton N Artemyev
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Arno Ehresmann
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - André Knie
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Philipp V Demekhin
- Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
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Knie A, Patanen M, Hans A, Petrov ID, Bozek JD, Ehresmann A, Demekhin PV. Angle-Resolved Auger Spectroscopy as a Sensitive Access to Vibronic Coupling. PHYSICAL REVIEW LETTERS 2016; 116:193002. [PMID: 27232020 DOI: 10.1103/physrevlett.116.193002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Indexed: 06/05/2023]
Abstract
In the angle-averaged excitation and decay spectra of molecules, vibronic coupling may induce the usually weak dipole-forbidden transitions by the excitation intensity borrowing mechanism. The present complementary theoretical and experimental study of the resonant Auger decay of core-to-Rydberg excited CH_{4} and Ne demonstrates that vibronic coupling plays a decisive role in the formation of the angle-resolved spectra by additionally involving the decay rate borrowing mechanism. Thereby, we propose that the angle-resolved Auger spectroscopy can in general provide very insightful information on the strength of the vibronic coupling.
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Affiliation(s)
- A Knie
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - M Patanen
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur Yvette Cedex, France
| | - A Hans
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - I D Petrov
- Rostov State Transport University, Narodnogo Opolcheniya Square 2, 344038 Rostov-on-Don, Russia
- Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia
| | - J D Bozek
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur Yvette Cedex, France
| | - A Ehresmann
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Ph V Demekhin
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
- Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia
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Demekhin PV, Petrov ID, Sukhorukov VL, Kielich W, Knie A, Schmoranzer H, Ehresmann A. Symmetry-forbidden electronic state interference observed in angularly resolved NO+ (A 1Π) deexcitation spectra of the N*O(2σ(-1)2π(2)) resonance. PHYSICAL REVIEW LETTERS 2010; 104:243001. [PMID: 20867297 DOI: 10.1103/physrevlett.104.243001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Indexed: 05/29/2023]
Abstract
Quantum mechanical interference between different pathways in inner-shell resonance excitation-deexcitation spectra is a realization of a double-slit experiment on the atomic scale. If the intermediate inner-shell resonances are of different symmetries, this interference is symmetry forbidden in the solid-angle-averaged or magic-angle-recorded deexcitation spectra. It has, however, been suggested that interference may by observable in off-magic-angle-recorded spectra. Here, we prove this interference in angularly resolved deexcitation spectra of the 2σ(-1)2π(2)(2Δ,2Σ±) resonances of N*O by a quantitative comparison between ab initio calculations and experiment.
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Affiliation(s)
- Ph V Demekhin
- Institute of Physics and CINSaT, University of Kassel, D-34132 Kassel, Germany.
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