نتایج جستجو برای: x ray fluorescence
تعداد نتایج: 760998 فیلتر نتایج به سال:
Resonant inelastic x-ray scattering (RIXS) has been observed in many systems above and below their core threshold. Below threshold, inelastic-loss features are observed, which disperse linearly with excitation energy, but as the excitation increases above the core binding energy, in general nonlinear dispersive effects are observed. These two effects are described by the same physics of coheren...
Thomas Bristow, Robert Downs, Marc Gailhanou, Franck Marchis, Douglas Ming, Richard Morris, Vicente Armando Solé, Kathleen Thompson, Philippe Walter, Michael Wilson, Albert Yen and Samuel Webb, NASA Ames Research Center, Moffett Field, CA [email protected], SETI Institute, Mountain View, CA, Univ. of Arizona, Tucson AZ, IM2NP, Université Paul Cézanne, Marseille, France, NASA Johnson Space Ce...
Micro X-ray fluorescence ~MXRF! offers the analyst a new approach to materials characterization. The range of applications is expanding rapidly. Single point analysis has been demonstrated for nanoliter volumes with detection limits at the 0.5 ng level. MXRF can be used as an element specific detector for capillary electrophoresis. Elemental imaging applications include analysis of sample corro...
In experiments preliminary to the design of an X-ray-excited optical luminescence (XEOL)-based chemical mapping tool we have used X-ray micro (4.5 × 5.2 μm) and macro (1 × 6 mm) beams with similar total fluxes to assess the effects of a high flux density beam of X-rays at energies close to an absorption edge on inorganic surfaces in air. The near surface composition of corroded cupreous alloys ...
X-ray fluorescence offers unparalleled sensitivity for imaging the nanoscale distribution of trace elements in micrometer thick samples, while x-ray ptychography offers an approach to image light element containing structures at a resolution beyond that of the x-ray lens used. These methods can be used in combination, and in continuous scan mode for rapid data acquisition when using multiple pr...
چکیده ندارد.
X-ray fluorescence computed tomography (XFCT) is a molecular imaging technique that can be used to sense different elements or nanoparticle (NP) agents inside deep samples tissues. However, XFCT has not been popular tool because it limited sensitivity and spatial resolution. We present benchtop system in which superfine pencil-beam source ring of spectrometers were simulated using GATE (Geant4 ...
The development of highly efficient X-ray optics has allowed the development of bench-top XRF systems which have high intensity X-ray beams with diameters ranging from 10 micrometres through to a few millimetres. Coupled with integrated high magnification optical cameras, these systems are ideally suited to the needs of the forensic scientist. A microscopic particle from a crime scene can be an...
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