Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Energy dispersive

Figure Bl.24.14. A schematic diagram of x-ray generation by energetic particle excitation, (a) A beam of energetic ions is used to eject inner-shell electrons from atoms in a sample, (b) These vacancies are filled by outer-shell electrons and the electrons make a transition in energy in moving from one level to another this energy is released in the fomi of characteristic x-rays, the energy of which identifies that particular atom. The x-rays that are emitted from the sample are measured witli an energy dispersive detector. Figure Bl.24.14. A schematic diagram of x-ray generation by energetic particle excitation, (a) A beam of energetic ions is used to eject inner-shell electrons from atoms in a sample, (b) These vacancies are filled by outer-shell electrons and the electrons make a transition in energy in moving from one level to another this energy is released in the fomi of characteristic x-rays, the energy of which identifies that particular atom. The x-rays that are emitted from the sample are measured witli an energy dispersive detector.
An alternative type of spectrometer is the energy dispersive spectrometer which dispenses with a crystal dispersion element. Instead, a type of detector is used which receives the undispersed X-ray fluorescence and outputs a series of pulses of different voltages that correspond to the different wavelengths (energies) that it has received. These energies are then separated with a multichannel analyser. [Pg.324]

An energy dispersive spectrometer is cheaper and faster for multielement analytical purposes but has poorer detection limits and resolution. [Pg.324]

A scanning electron microscope can also be equipped with additional instmmentation for electron-excited x-ray analysis (9). In many systems, this is performed in the mode known as energy dispersive x-ray analysis (edx). Other common acronyms for this method are eds for energy dispersive spectroscopy or edax for energy dispersive analysis of x-rays. [Pg.271]

Chemical analysis of the metal can serve various purposes. For the determination of the metal-alloy composition, a variety of techniques has been used. In the past, wet-chemical analysis was often employed, but the significant size of the sample needed was a primary drawback. Nondestmctive, energy-dispersive x-ray fluorescence spectrometry is often used when no high precision is needed. However, this technique only allows a surface analysis, and significant surface phenomena such as preferential enrichments and depletions, which often occur in objects having a burial history, can cause serious errors. For more precise quantitative analyses samples have to be removed from below the surface to be analyzed by means of atomic absorption (82), spectrographic techniques (78,83), etc. [Pg.421]

Elemental chemical analysis provides information regarding the formulation and coloring oxides of glazes and glasses. Energy-dispersive x-ray fluorescence spectrometry is very convenient. However, using this technique the analysis for elements of low atomic numbers is quite difficult, even when vacuum or helium paths are used. The electron-beam microprobe has proven to be an extremely useful tool for this purpose (106). Emission spectroscopy and activation analysis have also been appHed successfully in these studies (101). [Pg.422]

The two most useful supplementary techniques for the light microscope are EDS and FTIR microscopy. Energy dispersed x-ray systems (EDS) and Eourier-transform infrared absorption (ETIR) are used by chemical microscopists for elemental analyses (EDS) of inorganic compounds and for organic function group analyses (ETIR) of organic compounds. Insofar as they are able to characterize a tiny sample microscopically by PLM, EDS and ETIR ensure rapid and dependable identification when appHed by a trained chemical microscopist. [Pg.334]

Energy dispersive spectrometers can, in general, collect the spectmm faster and are less expensive than the more sophisticated wavelength dispersive spectrometers. However, they do not have the resolution and cannot separate closely spaced lines as easily as the wavelength dispersive spectrometers. [Pg.382]

Both the wavelength dispersive and energy dispersive spectrometers are well suited for quaUtative analysis of materials. Each element gives on the average only six emission lines. Because the characteristic x-ray spectra are so simple, the process of allocating atomic numbers to the emission lines is relatively simple and the chance of making a gross error is small. [Pg.382]

Asbestos fiber identification can also be achieved through transmission or scanning electron microscopy (tern, sem) techniques which are especially usefiil with very short fibers, or with extremely small samples (see Microscopy). With appropriate peripheral instmmentation, these techniques can yield the elemental composition of the fibers using energy dispersive x-ray fluorescence, or the crystal stmcture from electron diffraction, selected area electron diffraction (saed). [Pg.352]

FiaaHy, ia method (4) the fabric is padded with a mixture of medium energy disperse dyes, carehiUy selected higher reactivity, and rapid diffusiag fiber-reactive dyes, up to 10 g/L sodium bicarbonate depending on depth of shade, and proprietary auxiHary agents. [Pg.366]

In both these continuous processes medium to high energy disperse dyes should be used to avoid the risk of dye subliming to contaminate the atmosphere of the fixation unit and then staining the print by vapor-phase dyeing, or to produce a loss of definition of the printed mark due to diffusion from the appHed thickened paste. [Pg.371]

Benchtop X-ray energy dispersive analyzer BRA-17-02 based on a gas-filled electroluminescent detector with an x-ray tube excitation and range of the elements to be determined from K (Z=19) to U (Z=92) an electroluminescent detector ensures two times better resolution compared with traditional proportional counters and possesses 20 times greater x-ray efficiency compared with semiconductor detectors. The device is used usually for grits concentration determination when analysing of aviation oils (certified analysis procedures are available) and in mining industry. [Pg.76]

Portable x-ray energy dispersive sulphur in oil analyser ASE-1 with measurement range 0.015 - 5% and a detection limit near 0.001%. SPARK-1-2M, BRA-17-02 and ASE-1 have been certified as measuring... [Pg.76]

Development of a benchtop energy dispersive analyser BRA-18 is carrying out which is based on Si-drift detector and x-ray tube with side window range of the elements to be determined is extended from Mg to U. The distinctive feature of the device is that a specimen to be analysed is placed in the open air. [Pg.76]

These samples were measured non-destructively by energy-dispersive XRF with synclirotron radiation excitation (SYXRS), by g-XRF, by wavelength-dispersive XRF (WDXRS), and by Rutherford back scattering (RBS), by X-ray reflectometry (XRR) and by destructive secondary ion mass spectrometry (SIMS) as well (both last methods were used for independant comparison). [Pg.411]


See other pages where Energy dispersive is mentioned: [Pg.1312]    [Pg.1622]    [Pg.1625]    [Pg.1628]    [Pg.1631]    [Pg.1828]    [Pg.1842]    [Pg.1850]    [Pg.7]    [Pg.362]    [Pg.285]    [Pg.416]    [Pg.420]    [Pg.487]    [Pg.140]    [Pg.332]    [Pg.332]    [Pg.332]    [Pg.335]    [Pg.11]    [Pg.41]    [Pg.320]    [Pg.320]    [Pg.252]    [Pg.382]    [Pg.393]    [Pg.195]    [Pg.365]    [Pg.365]    [Pg.217]    [Pg.90]    [Pg.134]    [Pg.134]    [Pg.451]   
See also in sourсe #XX -- [ Pg.234 ]

See also in sourсe #XX -- [ Pg.267 , Pg.278 ]

See also in sourсe #XX -- [ Pg.238 ]




SEARCH



Additivity of the second-order dispersion energy

Analyzers energy-dispersive

Axilrod-Teller dispersion energy

B3LYP calculations with dispersion energy

Colloidal dispersions interaction energies

Compositional analysis energy dispersive

Diffractometry energy-dispersive

Dispersal of Energy and Matter

Dispersion component of surface energy

Dispersion energies aromatic molecules

Dispersion energies short-range

Dispersion energies, between solvent

Dispersion energy

Dispersion energy anisotropy

Dispersion energy coefficients

Dispersion energy definition

Dispersion energy in the multipole representation

Dispersion energy molecular forces

Dispersion energy triple-dipole

Dispersion energy, estimation

Dispersion forces surface energy component

Dispersion interaction energy

Dispersion self-energy

Dispersion surface energy

Dispersion-repulsion energy

Dispersions total energy content

Dispersive component of the surface free energy

Dispersive components of surface free energy

Dispersive element dissociation energy

Dispersive solvation energy

Dispersive surface energy component

Dissolution dispersal of particle energy

ED AX (energy-dispersive X-ray

EDAX (energy dispersive analysis

EDS (energy dispersive

EDX (energy dispersive X-ray

EDX (energy dispersive analysis

EDXA (Energy dispersive x-ray

EDX—See Energy dispersive x-ray

ENTROPY IS A MEASURE OF DISPERSED ENERGY

EXAFS energy-dispersive XAFS

Electron energy dispersive-spectroscopy

Electron microprobe energy-dispersive

Electron microprobe energy-dispersive analysis

Electron microscopy energy-dispersive analysis

Electrostatic analyzer energy dispersion

Energy Dispersion 15-7 Spectrometers

Energy Dispersion Spectroscopy (EDS

Energy Dispersion X-ray analyzer

Energy Dispersive Spectroscopy (EDS) and its Application

Energy Dispersive X-Ray Microanalysis in the Electron Microscope

Energy and wavelength dispersive x-ray

Energy band dispersion

Energy dispersal

Energy dispersal

Energy disperse X-ray detection

Energy disperse spectroscopy , metal

Energy disperse spectroscopy , metal deposition

Energy disperse x-ray spectroscopy

Energy dispersion X-ray spectra

Energy dispersion component

Energy dispersion curve

Energy dispersion process

Energy dispersion process discussion

Energy dispersive X-ray analysis EDAX)

Energy dispersive X-ray diffraction EDXD)

Energy dispersive X-ray diffraction EDXRD)

Energy dispersive X-ray fluorescence (ED-XRF

Energy dispersive X-ray fluorescence analysis (EDXRF

Energy dispersive X-ray spectrometry

Energy dispersive X-ray spectroscopy

Energy dispersive X-ray spectroscopy (EDS

Energy dispersive X-ray spectroscopy (EDX

Energy dispersive X-ray spectrum

Energy dispersive XRF

Energy dispersive XRF spectrometer

Energy dispersive analysis

Energy dispersive analysis by x-rays

Energy dispersive compositional

Energy dispersive spectromete

Energy dispersive spectrometer

Energy dispersive spectrometers (EDS

Energy dispersive spectrometry

Energy dispersive spectroscopy

Energy dispersive spectroscopy , doped

Energy dispersive spectroscopy characterization

Energy dispersive spectroscopy, EDS

Energy dispersive x-ray analysis, EDXA,

Energy dispersive x-ray spectrometry (EDX

Energy effective dispersion coefficients

Energy greatest dispersal

Energy silicone rubber dispersion

Energy with disperse dyes

Energy-Dispersive Analysis (EDS)

Energy-Dispersive X-Ray (EDX) Analysis

Energy-dispersive EXAFS

Energy-dispersive X-ray

Energy-dispersive X-ray analysi

Energy-dispersive X-ray analysis

Energy-dispersive X-ray fluorescence

Energy-dispersive X-ray fluorescence EDXRF)

Energy-dispersive X-ray fluorescence techniques

Energy-dispersive X-ray spectroscopy EDXS)

Energy-dispersive camera

Energy-dispersive diffraction

Energy-dispersive spectrometr

Energy-dispersive systems

Energy-dispersive x-ray detector

Energy-dispersive x-ray diffraction

Energy-dispersive x-ray mapping

Energy-dispersive x-ray microanalysis

Flat band electron energy dispersion

Fourier Transform Infrared and Energy-Dispersive -ray Spectroscopy

Free-disperse systems interfacial energy

Graphite energy dispersion

Hamiltonian and Energy Dispersion

High-spatial-resolution energy dispersive

High-spatial-resolution energy dispersive spectroscopy

Homogeneous dielectrics dispersion energies

Hybrid dispersion Surface free energy

Induction/dispersion interactions energy

Instrumentation for Energy Dispersive X-Ray Spectrometry

Integrals dispersion energy

Intermolecular potentials dispersion energy

Lennard Jones empirical potentials dispersion energy

London dispersion energy

Long-range effects. The dispersion energy

Membranes scanning electron microscopy/energy dispersive

Molecular interactions dispersion energies

Nanoparticle energy dispersive spectroscopy

Nanoparticles energy-dispersed analysis

Of London dispersive energy

Polarizable continuum model dispersion energies

Polymeric dispersants electrostatic energy barrier

Relative Importance of Electrostatic and Dispersion Energies

Retarded Dispersion Energy

Scanning Electron Microscopy and Energy Dispersive Spectrometry Analyses

Scanning electron microscopy and energy dispersive analysis using X-rays

Scanning electron microscopy coupled with energy-dispersive

Scanning electron microscopy energy dispersive X-ray spectroscopy

Scanning electron microscopy with energy dispersive

Scanning electron microscopy/energy dispersive X-ray analysis (SEM

Solvation dispersion energy

Substances Contain Dispersed Energy

Surface energy dispersion component

The Dispersion Energy Problem

The dispersive element of electron energy analysers

Theoretical Methods to Compute the Dispersion Energy

Thermal energy dispersal

Tomographic energy-dispersive diffraction

Tomographic energy-dispersive diffraction imaging

Trapping energy, dispersion

X-ray energy dispersive spectroscopy XEDS)

© 2024 chempedia.info