TY  - JOUR
UR  - http://dx.doi.org/10.1088/1361-6455/ad421f
TI  - Separation of kinetic rate orders in extreme ultraviolet transient grating spectroscopy
N1  - Original content from this work may be used under the terms
of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
SN  - 0953-4075
ID  - discovery10192209
AV  - public
JF  - Journal of Physics B: Atomic, Molecular and Optical Physics
IS  - 11
N2  - We present an Extreme Ultraviolet (EUV) transient grating (TG) experiment of the spinel Co3O4 compound using tuneable incident energies across the Co M2,3-edge and a 395 nm probe pulse, detecting both the first and the second diffraction orders. While the first diffraction order shows a monotonous behaviour 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 second diffraction order 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 rationalised 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. These results highlight the use of the response of the second diffraction order in EUV TG as a tool to identify higher order terms in the population kinetics.
PB  - IOP Publishing
Y1  - 2024/05/07/
VL  - 57
A1  - Marroux, Hugo JB
A1  - Polishchuk, Serhii
A1  - Cannelli, Oliviero
A1  - Ingle, Rebecca
A1  - Mancini, Giulia F
A1  - Bacellar, Camila
A1  - Puppin, Michele
A1  - Géneaux, Romain
A1  - Knopp, Gregor
A1  - Foglia, Laura
A1  - Pedersoli, Emanuele
A1  - Capotondi, Flavio
A1  - Nikolov, Ivaylo
A1  - Bencivenga, Filippo
A1  - Mincigrucci, Riccardo
A1  - Masciovecchio, Claudio
A1  - Chergui, Majed
ER  -