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research article

Separation of kinetic rate orders in extreme ultraviolet transient grating spectroscopy

Marroux, Hugo J. B.  
•
Polishchuk, Serhii  
•
Cannelli, Oliviero  
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June 14, 2024
Journal Of Physics B-Atomic Molecular And Optical Physics

We present an extreme ultraviolet (EUV) transient grating (TG) experiment of the spinel Co3O4 compound using tuneable incident energies across the Co M-2,M-3-edge and a 395 nm probe pulse, detecting both the first and the second diffraction orders (SDOs). While the first diffraction order shows a monotonous behavior as a function of time, with a sharp response at t = 0, followed by a weak sub-picosecond component and a nearly constant signal thereafter, the time dependence of SDO varies dramatically with the incident energy as it is tuned across the Co M-edge, with the appearance of a component at t > 1 ps that grows with increasing energy. The results are rationalized in terms of the deviations of the initial grating from sinusoidal to non-sinusoidal, namely a flattening of the grating pattern, that introduces new Fourier components. These deviations are due to higher order, three-body terms in the population relaxation kinetics. The present results highlight the use of the SDO response in EUV TG as a tool to identify higher order terms in the population kinetics.

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Type
research article
DOI
10.1088/1361-6455/ad421f
Web of Science ID

WOS:001219527400001

Author(s)
Marroux, Hugo J. B.  
•
Polishchuk, Serhii  
•
Cannelli, Oliviero  
•
Ingle, Rebecca Ann  
•
Mancini, Giulia F.  
•
Bacellar, Camila  
•
Puppin, Michele  
•
Geneaux, Romain
•
Knopp, Gregor
•
Foglia, Laura
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Date Issued

2024-06-14

Publisher

Iop Publishing Ltd

Published in
Journal Of Physics B-Atomic Molecular And Optical Physics
Volume

57

Issue

11

Article Number

115401

Subjects

Physical Sciences

•

Electron-Hole Recombination

•

Transient Gratings

•

Spinel Cobalt Oxide

•

Ultrafast

•

Extreme Ultraviolet

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
DQML  
FunderGrant Number

ERC Advanced Grants DYNAMOX

695197

French-German-Swiss Solar Nitrogen Fixation

Ammonia from Sunlight and Air

20SC-1_187032

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Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208320
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