XFS X-ray Fluorescence

WAXD wide angle X-ray diflfaction, XFS X-ray fluorescence spectroscopy... 

Any variations in the composition, structure, stereochemistry or coordination character of a molecule change its chemical properties and MO (molecular orbital) structure. MO changes are clearly observed by the fine structure of XFS (X-ray fluorescence spectroscopy). This makes it possible to relate some features of the chemical behaviour of compounds to their electronic structure and opens a way to various chemical property-electronic structure parameter correlations which are frequently of help for explaining and predicting the chemical properties of compounds. 

Other analytical techniques that have been employed for measuring barium and its compounds in environmental media include x-ray fluorescence spectroscopy (XFS), neutron activation analysis (NAA), scintillation spectroscopy, and spectrography (Boothe and James 1985 Landis and Coons 1954 Larsen 1973 Murata and Noguchi 1974 Oppenheimer et al. 1984). XFS and NAA methods are less sensitive than other available analytical methods for measuring barium or its compounds in environmental media. Scintillation spectroscopy and spectrography are less commonly used to measure barium in the environment relative to other analytical methods. 

There are several methods for directly depicting metal distributions in plants, including autoradiography and X-ray fluorescence (XRF or XFS). The former method - essentially the procedure by which Becquerel discovered the phenomenon of radioactivity in 1896 -means using and detecting (by photographical means) emission by some radionuclide (often non-metals such as "C, but also Ee and Cd (Figs. 2.7 and... 

We have also determined yttrium by x-ray fluorescence (XFS). We will continue to use ICP and AA for yttrium in solutions but for solids MOR bars XFS is being evaluated and compared with the AA and ICP after digestion of the bars. The data base being generated will establish the reproducibility and ease of many of these techniques. 

Rontgenbeugung sdiagramm, Rontgenbeugung saufnahme, Rontgendiagramm, Rontgenbeugung smuster X-ray emission spectroscopy (XES) Rontgenemissionsspektroskopie X-ray fluorescence spectroscopy (XFS)... 

X-ray emission spectra are usually excited by X-ray photons because most chemical compounds are decomposed by electron bombardment. With X-ray emission spectra excitation by photons [secondary emission or fluorescence (XFS)] the fluorescent line intensity depends on the exciting photon energy hv 1- = 0 if < aV. All lines of the ith series appear if hv = aV however, decreases little with further increase in hv. Therefore, to excite X-ray fluoresence one must use a target that contains a substance with intense characteristic X-ray lines whose energy just exceeds eVi, Using the continous radiation of an X-ray tube with a target consisting mostly of heavy elements it is possible to excite X-ray fluorescence. 

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