Transition rates were obtained from spectra for pure metallic samples of atomic number ranging from 22 to 27, measured with monochromatic incident X-ray beams from a synchrotron source. The experimental setup for this consisted of an energy dispersive spectrometer in a conventional 45–45 geometry, mounted in an evacuated chamber. Absorption, detector efficiency and multiple scattering were take...

α-fe2o3 (hematite) is the most stable iron oxide under ambient conditions. this transition metal oxide has been extensively investigated because it has unique electrical and catalytic properties. in this report, a novel microwave method for preparation of α-fe2o3 nanoparticles has been developed. the process contained two steps: first, precursor were obtained from a mixed solution of 50 ml of 0...

in this research zinc oxide (zno) nano-crystalline powders were prepared by sol-gel method using zinc acetate. the zno nanoparticles were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem), ultraviolet-visible (uv-vis), fourier transform infra-red (ft-ir) and energy dispersive x-ray (edx) spectroscopy. the structure of nanoparticles was studied using xrd pattern. the c...

A passive electrostatic recycling spectrometer for charged particles is described and demonstrated to store electrons with typical kinetic energies of tens of eV. The design of the charged particle optics and the basic operating characteristics of the storage ring are discussed. The storage lifetime achieved is approximately 50 micros, which is target gas pressure limited and corresponds to app...

The contamination of the Raman scattering signal with luminescence is a well-known problem when dealing with biological media excited by visible light. The viability of the shifted-excitation Raman difference spectroscopy (SERDS) technique for luminescence suppression on Raman spectra of biological samples was studied in this work. A tunable Lithrow-configuration diode laser (λ = 785 and 830 nm...

A method of feature extraction based on principal component analysis (PCA) to identify drugs packed in anthropomorphic phantom was proposed. An energy dispersive X-ray diffraction spectrometer was used to acquire the spectra of drugs and the other materials. Features of spectra were extracted by PCA which excels in analyzing highdimensional data. Furthermore, the number of principal components ...

A new chelating material from mercerized cotton linter was prepared by a reaction with succinic anhydride in the presence of toluene/triethylamine and a 4-dimethylaminopyridine catalyst, followed by reacting with Fe(III) to obtain the final product. The materials were characterized by Fourier transform infrared spectrometry, scanning electron microscopy, and energy dispersive spectrometer; the ...

Wavelength-dispersive high-resolution X-ray spectrometers often employ elastically bent crystals for the wavelength analysis. In a preceding paper [Honkanen et al. (2014). J. Synchrotron Rad. 21, 104-110] a theory for quantifying the internal stress of a macroscopically large spherically curved analyser crystal was presented. Here the theory is applied to compensate for the corresponding decrea...

An inter-laboratory exercise has been carried out to evaluate the analytical performance of Method for Determining Hazardous Substances: MDHS 91 for determining Metals and metalloids in workplace air by X-ray fluorescence spectrometry, published by the Health and Safety Executive, United Kingdom. Sets of prepared filter standards were used to “transport” a master calibration established on an X...

Traditionally Electron Probe Micro Analysis (EPMA) has relied upon precise characterization of the continuum intensities adjacent to the emission line of interest using Wavelength Dispersive Spectrometry (WDS) for determination of the background under the peak. Recent improvements including new hardware designs with large area Bragg crystals, new software methods implementing exponential and po...