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oai:recercat.cat:2117/3405662026-02-11T05:13:00Zcom_2072_1033col_2072_452950

Localized Core Four-Wave Mixing Buildup in the X-ray Spectrum of Chemical Species Serrat Jurado, Carles Universitat Politècnica de Catalunya. Departament de Física Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers Àrees temàtiques de la UPC::Física X-Rays Absorption Density functionals Raigs X Absorció (Físico-química) Funcional de densitat, Teoria del Using the Kohn–Sham density functional theory, we numerically study the four-wave mixing response of a carbon atom model system exposed to a train of femtosecond two color ω–3ω random phase coherent X-ray pulses near the K-edge. The phase-sensitivity cancellation of the 5ω anti-Stokes component previously described in two- and three-level systems in the infrared and optical regions is extended into the X-ray. Resonances with the absorption lines in the XANES and EXAFS regions produce 5ω peak intensities that increase near the phase-sensitivity cancellation frequencies. Based on this effect, we predict that highly selective intense X-ray 5ω photon energies can be achieved in real systems. The high localization of the ω–3ω four-wave mixing nonlinear technique that we address entails a new valuable tool in X-ray spectroscopies of chemical species as it can readily be extended to different photon energies in other atomic absorption edges, with broad applications. Peer Reviewed Postprint (author's final draft) 2021-01-20 Article Serrat, C. Localized Core Four-Wave Mixing Buildup in the X-ray Spectrum of Chemical Species. "Journal of Physical Chemistry Letters", 20 Gener 2021, vol. 12, núm. 3, p. 1093-1097. 1948-7185 https://hdl.handle.net/2117/340566 10.1021/acs.jpclett.0c03270 eng https://pubs.acs.org/doi/10.1021/acs.jpclett.0c03270 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-85526-R/ES/OPTICA NOLINEAL DE ATTOSEGUNDOS Y LASERES DE RAYOS X/ Open Access 5 p. application/pdf