نتایج جستجو برای: ray fluorescence spectra
تعداد نتایج: 493581 فیلتر نتایج به سال:
We present the result of a systematic search for the iron Kα fluorescent line at ∼ 6.4 keV among 1616 X-ray sources detected by ultra-deep Chandra observations of the Orion Nebula Cluster and the obscured Orion Molecular Cloud 1 population as part of the Chandra Orion Ultra-deep Project (COUP). Seven sources are identified to have an excess emission at ∼ 6.4 keV among 127 control sample sources...
In this study, we compared the high-energy resolution X-ray fluorescence absorption near-edge structure (HERFD-XANES) and normal XANES spectra of various iron (Fe) species Fe in atmospheric aerosol samples to explore advantages K-edge HERFD-XANES for speciation aerosols using linear combination fitting (LCF) spectra. We also conducted extraction experiments validate LCF-XANES. spectra, pre-edge...
A quantitative and comprehensive knowledge of leaf fluorescence is required for the interpretation of fluorescence signals at the canopy level and also for the modelling of leaf and canopy fluorescence. In this work we present full range fluorescence excitation and emission spectra of intact leaves, expressed in units of apparent spectral fluorescence yield, from both the adaxial and the abaxia...
During the development of neoplasia, epithelial tissues undergo biochemical and structural changes that can manifest in tissue fluorescence. There have been several reports on different in vivo fluorescence characteristics between normal and precancerous (dysplastic) tissues. However, it has been difficult to identify and quantify the origins of these changes, mainly because of distortions intr...
We have measured angular-dependent fluorescence-yield x-ray magnetic circular dichroism spectra on single crystals of the heterometallic $3d\ensuremath{-}4f$ 12-metallacrown-4 ${\mathrm{TbMn}}_{4}$ and ${\mathrm{DyMn}}_{4}$ complexes. Simulated using crystal-field multiplet calculations reproduce experimentally observed spectra. The orientation molecules causes linear $4f$ absorption This natur...
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