title: Femtosecond X-Ray fluorescence
abstract: Using few-cycle-driven coherent laser harmonics, K-shell vacancies have been created in light elements, such as boron (E(B) = 188 eV) and carbon (E(B) = 284 eV), on a time scale of a few femtoseconds for the first time. The capability of detecting x-ray fluorescence excited by few-femtosecond radiation with an accuracy of the order of 1 eV paves the way for probing the evolution of the microscopic environment of selected atoms in chemical and biochemical reactions on previously inaccessible time scales (<100 fs) by tracing the temporal evolution of the "chemical shift" of peaks associated with inner-shell electronic transitions in time-resolved x-ray fluorescence and photoelectron spectra.
authors.affiliation: Institut fur Photonik, Technische Universitat Wien, Gusshausstrasse 27-29, A-1040 Wien, Austria.
authors.initials: M
authors.lastname: Schnurer
authors.initials: C
authors.lastname: Streli
authors.initials: P
authors.lastname: Wobrauschek
authors.initials: M
authors.lastname: Hentschel
authors.initials: R
authors.lastname: Kienberger
authors.initials: C
authors.lastname: Spielmann
authors.initials: F
authors.lastname: Krausz