Marroux, Hugo JB;
Polishchuk, Serhii;
Cannelli, Oliviero;
Ingle, Rebecca;
Mancini, Giulia F;
Bacellar, Camila;
Puppin, Michele;
... Chergui, Majed; + view all
(2024)
Separation of kinetic rate orders in extreme ultraviolet transient grating spectroscopy.
Journal of Physics B: Atomic, Molecular and Optical Physics
, 57
(11)
, Article 115401. 10.1088/1361-6455/ad421f.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Separation of kinetic rate orders in extreme ultraviolet transient grating spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1361-6455/ad421f |
| Publisher version: | http://dx.doi.org/10.1088/1361-6455/ad421f |
| Language: | English |
| Additional information: | 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. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10192209 |
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