Separation of kinetic rate orders in extreme ultraviolet transient grating spectroscopy

• DOI: 10.1088/1361-6455/ad421f
• Publication Date: 2024-04-23T22:43:00Z
• Authors: Hugo J B Marroux; Serhii Polishchuk; Oliviero Cannelli; Rebecca A Ingle; Giulia F Mancini; Camila Bacellar; Michele Puppin; Romain Geneaux; Gregor Knopp; Laura Foglia; Emanuele Pedersoli; Flavio Capotondi; Ivaylo Petrov Nik...; Filippo Bencivenga; Riccardo Mincigrucci; Claudio Masciovec...; Majed Chergui
• Keywords: Extreme ultraviolet; Transient (computer programming); Ultraviolet; Ultraviolet visible spectroscopy; Separation (statistics)

Abstract We present an extreme ultraviolet (EUV) transient grating (TG) experiment of the spinel Co 3 O 4 compound using tuneable incident energies across M 2,3 -edge and a 395 nm probe pulse, detecting both first second diffraction orders (SDOs). While order shows monotonous behavior as function time, with sharp response at t = 0, followed by weak sub-picosecond component nearly constant signal thereafter, time dependence SDO varies dramatically energy it is tuned M-edge, appearance > 1 ps that grows increasing energy. The results are rationalized in terms deviations initial from sinusoidal to non-sinusoidal, namely flattening pattern, introduces new Fourier components. These due higher order, three-body population relaxation kinetics. highlight use EUV TG tool identify