Time-resolved Auger–Meitner spectroscopy of the photodissociation dynamics of CS2

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2024-11, Vol.57 (21)
• Main Authors: Thompson, Henry J, Plekan, Oksana, Bonanomi, Matteo, Pal, Nitish, Allum, Felix, Brynes, Alexander D, Coreno, Marcello, Coriani, Sonia, Danailov, Miltcho B, Decleva, Piero, Demidovich, Alexander, Devetta, Michele, Faccialà, Davide, Feifel, Raimund, Forbes, Ruaridh, Grazioli, Cesare, Holland, David M P, Piseri, Paolo, Prince, Kevin C, Rolles, Daniel, Schuurman, Michael S, Simoncig, Alberto, Squibb, Richard J, Tenorio, Bruno N C, Vozzi, Caterina, Zangrando, Marco, Callegari, Carlo, Minns, Russell S, Di Fraia, Michele
• Format: Article
• Language: English
• Subjects: Atom and Molecular Physics and Optics; Atom- och molekylfysik och optik; Auger spectroscopy; free electron lasers; time-resolved x-ray spectroscopy
• ISSN: 0953-4075; 1361-6455; 1361-6455
• DOI: 10.1088/1361-6455/ad7e89

The photodissociation dynamics of UV excited CS2 are investigated using time-resolved Auger-Meitner (AM) spectroscopy. AM decay is initiated by inner-shell ionisation with a femtosecond duration x-ray (179.9 eV) probe generated by the FERMI free electron laser. The time-delayed x-ray probe removes an electron from the S(2p) orbital leading to secondary emission of a high energy electron through AM decay. We monitor the electron kinetic energy of the AM emission as a function of pump-probe delay and observe time-dependent changes in the spectrum that correlate with the formation of bound, excited-state CS2 molecules at early times, and CS + S fragments on the picosecond timescale. The results are analysed based on a simplified kinetic scheme that provides a time constant for dissociation of approximately 1.2 ps, in agreement with previous time-resolved x-ray photoelectron spectroscopy measurements.