title: Double conical crystal x-ray spectrometer for high resolution ultrafast x-ray absorption near-edge spectroscopy of Al K edge.
abstract: An x-ray spectrometer devoted to dynamical studies of transient systems using the x-ray absorption fine spectroscopy technique is presented in this article. Using an ultrafast laser-induced x-ray source, this optical device based on a set of two potassium acid phthalate conical crystals allows the extraction of x-ray absorption near-edge spectroscopy structures following the Al absorption K edge. The proposed experimental protocol leads to a measurement of the absorption spectra free from any crystal reflectivity defaults and shot-to-shot x-ray spectral fluctuation. According to the detailed analysis of the experimental results, a spectral resolution of 0.7 eV rms and relative fluctuation lower than 1% rms are achieved, demonstrated to be limited by the statistics of photon counting on the x-ray detector.
authors.affiliation: Centre Lasers Intenses et Applications (CELIA), Université de Bordeaux-CNRS-CEA, Talence F-33405, France.
authors.forename: A
authors.initials: A
authors.lastname: Levy
authors.forename: F
authors.initials: F
authors.lastname: Dorchies
authors.forename: C
authors.initials: C
authors.lastname: Fourment
authors.forename: M
authors.initials: M
authors.lastname: Harmand
authors.forename: S
authors.initials: S
authors.lastname: Hulin
authors.forename: J J
authors.initials: JJ
authors.lastname: Santos
authors.forename: D
authors.initials: D
authors.lastname: Descamps
authors.forename: S
authors.initials: S
authors.lastname: Petit
authors.forename: R
authors.initials: R
authors.lastname: Bouillaud
mesh_terms: D000042:Absorption; D000465:Algorithms; D017607:Aluminum Compounds / Q000737:chemistry; D004867:Equipment Design; D005240:Feasibility Studies; D007834:Lasers; D016014:Linear Models; D017785:Photons; D010795:Phthalic Acids; D017680:Potassium Compounds; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D056928:X-Ray Absorption Spectroscopy / Q000295:instrumentation* / Q000379:methods*
chemical_list: D017607:Aluminum Compounds; D010795:Phthalic Acids; D017680:Potassium Compounds; C032279:phthalic acid