Femtosecond Soft-X-ray Absorption Spectroscopy of Liquids with a Water-Window High-Harmonic Source

Smith, Adam D.; Balciunas, Tadas; Chang, Yi-Ping; Schmidt, Cédric; Zinchenko, Kristina; Nunes, Fernanda B.; Rossi, Emanuele; Svoboda, Vít; Yin, Zhong; Wolf, Jean-Pierre; Wörner, Hans Jakob

doi:10.1021/acs.jpclett.9b03559

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Title		Femtosecond Soft-X-ray Absorption Spectroscopy of Liquids with a Water-Window High-Harmonic Source
Authors		Smith, Adam D. Balciunas, Tadas Chang, Yi-Ping Schmidt, Cédric Zinchenko, Kristina Nunes, Fernanda B. Rossi, Emanuele Svoboda, Vít Yin, Zhong Wolf, Jean-Pierre Wörner, Hans Jakob show all authors [1 - 11]
Published in		Journal of Physical Chemistry Letters. 2020, vol. 11, no. 6, p. 1981-1988
Abstract		Femtosecond X-ray absorption spectroscopy (XAS) is a powerful method to investigate the dynamical behavior of a system after photoabsorption in real time. So far, the application of this technique has remained limited to large-scale facilities, such as femtosliced synchrotrons and free-electron lasers (FEL). In this work, we demonstrate femtosecond time-resolved soft-X-ray absorption spectroscopy of liquid samples by combining a sub-micrometer-thin flat liquid jet with a high-harmonic tabletop source covering the entire water-window range (284-538 eV). Our work represents the first extension of tabletop XAS to the oxygen edge of a chemical sample in the liquid phase. In the time domain, our measurements resolve the gradual appearance of absorption features below the carbon K-edge of ethanol and methanol during strong-field ionization and trace the valence-shell ionization dynamics of the liquid alcohols with a temporal resolution of 30 fs. This technique opens unique opportunities to study molecular dynamics of chemical systems in the liquid phase with elemental, orbital, and site sensitivity.
Keywords		Soft X ray — Transient absorption — Liquids — Water window — High harmonics generation — Ethanol — Methanol
Identifiers		DOI: 10.1021/acs.jpclett.9b03559
Full text		Article (Published version) (1.6 MB) - Free access Other version: https://pubs.acs.org/doi/10.1021/acs.jpclett.9b03559
Structures		Faculté des sciences / Section de physique / Groupe de physique appliquée
Research group		Groupe Wolf
Projects		FNS: NCCR MUST (20021_172946) ERC Consolidator Grant (772797-ATTOLIQ)
Citation (ISO format)		SMITH, Adam D. et al. Femtosecond Soft-X-ray Absorption Spectroscopy of Liquids with a Water-Window High-Harmonic Source. In: Journal of Physical Chemistry Letters, 2020, vol. 11, n° 6, p. 1981-1988. doi: 10.1021/acs.jpclett.9b03559 https://archive-ouverte.unige.ch/unige:132260