In-laboratory EXAFS apparatus by use of plane-crystal monochromator.

A Single-Element Plane Grating Monochromator

Concerted rotations of a self-focused varied line-space diffraction grating about its groove axis and surface normal define a new geometric class of monochromator. Defocusing is canceled, while the scanned wavelength is reinforced at fixed conjugate distances and horizontal deviation angle. This enables high spectral resolution over a wide band, and is of particular advantage at grazing reflect...

Monochromator-induced glitches in EXAFS data II. Test of the model for a pinhole sample

Monochromator-induced glitches m the extended X-ray absorption fine structure (EXAFS) are studied using a pinhole sample . We have collected more detailed beam-profile data that enabled us to do a better simulation of the glitch shape. Applying the model we developed earlier, we obtain excellent agreement between the simulation and the experimental pinhole glitch . We point out that the EXAFS g...

CATALYST STRUCTURE STUDIED BY A LABORATORY EXAFS FACILITY : Ru/Al2O3

‏‎suppression of coke formation in thermal cracking by coke inhibitors‎‏

‏‎the main purpose of this research was to:1.develop a coking model for thermal cracking of naphtha.2.study coke inhibition methods using different coke inhibitors.developing a coking model in naphtha cracking reactors requires a suitable model of the thermal cracking reactor based on a reliable kinetic model.to obtain reliable results all these models shall be solved simultaneously.for this pu...

Adapting a Standard Thin-Layer Chromatography Apparatus for Laboratory Use

The Eastman Chromagram apparatus was employed in thin-layer chromatographic studies involving United States species of Polymnia (Compositae). Certain technical modifications of this apparatus were made in an attempt to more efficiently saturate the chamber with vapors of the eluents. Results indicated that a critical level of reproducibility could be achieved only with modified apparatus, which...