High-order harmonic generation with resonant core excitation by ultraintense X-rays

• Verfasst von: Buth, Christian [VerfasserIn]
• Titel: High-order harmonic generation with resonant core excitation by ultraintense X-rays
• Verf.angabe: Christian Buth
• E-Jahr: 2015
• Jahr: 15 October 2015
• Umfang: 27 S.
• Fussnoten: Gesehen am 30.10.2020
• Titel Quelle: Enthalten in: The European physical journal / D
• Ort Quelle: Berlin : Springer, 1998
• Jahr Quelle: 2015
• Band/Heft Quelle: 69(2015,10) Artikel-Nummer 234, 27 Seiten
• ISSN Quelle: 1434-6079
• DOI: doi:10.1140/epjd/e2015-60357-3
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1737430118

Abstract

High-order harmonic generation (HHG) is combined with resonant X-ray excitation of a core electron into the transient valence vacancy that is created in the course of the HHG process. To describe this setting, I develop a two-active-electron quantum theory for a single atom assuming no Coulomb interaction among the electrons; one electron performs a typical HHG three-step process whereas another electron is excited (or even Rabi flops) by intense X-rays from the core shell into the valence hole after the first electron has left the atom. Depending on the amplitude to find a vacancy in the valence and the core, the returning continuum electron recombines with the valence and the core, respectively, emitting high-order harmonic (HH) radiation that is characteristic of the combined process. After presenting the theory of X-ray boosted HHG for continuous-wave light fields, I develop a description for X-ray pulses with a time-varying amplitude and phase. My prediction offers novel prospects for nonlinear X-ray physics, attosecond X-rays, and HHG-based time-dependent chemical imaging involving core orbitals.