Physical properties of amorphous solid interstellar material from X-ray absorption spectroscopy of Scorpius X-1

Crystallization of Amorphous Germanium Investigated by X-ray Absorption Spectroscopy

X-ray Absorption Spectroscopy

X-ray absorptioń spectroscopy, today widely used as a tool for structural investigations, is described. Theoretically it is shown that above an absorption edge the absorption coefficient is well approximated by a sum of terms, each one describing a particular path followed by the photoelectron outgoing from the atom. Such geometrical feature allows to use X-ray absorption spectroscopy for struc...

X-ray Absorption Spectroscopy

1.59.1 PHYSICS OF X-RAY ABSORPTION 1 1.59.1.1 X-ray Absorption Edges 2 1.59.1.2 X-ray Fluorescence 3 1.59.1.3 Measurement of X-ray Absorption Spectra 3 1.59.2 EXTENDED X-RAY ABSORPTION FINE STRUCTURE 6 1.59.2.1 Theoretical Description of EXAFS Spectra 6 1.59.2.1.1 Single scattering 6 1.59.2.1.2 Multiple scattering 8 1.59.2.1.3 Other corrections to the EXAFS equation 9 1.59.2.2 Programs for Calc...

X-ray Absorption Spectroscopy on Amorphous Mixed-valent Alloys

X-ray absorption msurements were performed on & Pdl, and Eux armrphous alloys. In both systems, LIII edgesclearly demns t ra te a concentration-induced valence change. The Eu valence a&t u r e is found t o be inhomgeneous in nature. XANES and = experiments show the existence of well-defined local environments w h i c h are typical of those encountered for !&2+ and E U ~ + i n the Eu/Pd system. ...

X-ray Absorption Spectroscopy Using X–ray Fluorescence Spectrometer

Strong characteristic Kα X-ray lines are accompanied by weak lines due to the radiative Auger effect (RAE) [1, 2]. The characteristic Kα fluorescent X-rays (K-L2,3 lines) are emitted by the 2p→1s electric dipole transition after one of the 1s electron photoionization, Though the probability is less than 0.01, one of the 2p electrons is excited into an unoccupied discrete or continuum level simu...