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Electrons diffracted

Electron diffraction studies are usually limited to transferred films (see Chapter XV), One study on Langmuir films of fatty acids has used cryoelectron microscopy to fix the structures on vitrified water [179], Electron diffraction from these layers showed highly twinned structures in the form of faceted crystals. [Pg.130]

Transmission electron microscopy (TEM) can resolve features down to about 1 nm and allows the use of electron diffraction to characterize the structure. Since electrons must pass through the sample however, the technique is limited to thin films. One cryoelectron microscopic study of fatty-acid Langmuir films on vitrified water [13] showed faceted crystals. The application of TEM to Langmuir-Blodgett films is discussed in Chapter XV. [Pg.294]

HEED High-energy electron diffraction [104] Diffraction of elastically back-scattered electrons (-20 keV, grazing incidence) Surface structure... [Pg.313]

LEED Low-energy electron diffraction [62, 75, 105] Elastic backscattering of electrons (10-200 eV) Surface structure... [Pg.313]

RHEED Reflection high-energy electron diffraction [78, 106] Similar to HEED Surface structure, composition... [Pg.313]

SHEED Scanning high-energy electron diffraction [106] Scanning version of HEED Surface heterogeneity... [Pg.313]

Bartell and co-workers have made significant progress by combining electron diffraction studies from beams of molecular clusters with molecular dynamics simulations [14, 51, 52]. Due to their small volumes, deep supercoolings can be attained in cluster beams however, the temperature is not easily controlled. The rapid nucleation that ensues can produce new phases not observed in the bulk [14]. Despite the concern about the appropriateness of the classic model for small clusters, its application appears to be valid in several cases [51]. [Pg.337]

The technique of low-energy electron diffraction, LEED (Section VIII-2D), has provided a considerable amount of information about the manner in which a chemisorbed layer rearranges itself. Somotjai [13] has summarized LEED results for a number of systems. Some examples are collected in Fig. XVlII-1. Figure XVIII-la shows how N atoms are arranged on a Fe(KX)) surface [14] (relevant to ammonia synthesis) even H atoms may be located, as in Fig. XVIII-Ih [15]. Figure XVIII-Ic illustrates how the structure of the adsorbed layer, or adlayer, can vary wiA exposure [16].f There may be a series of structures, as with NO on Ru(lOTO) [17] and HCl on Cu(llO) [18]. Surface structures of... [Pg.686]

Takayanagi K, Tanishiro Y, Takahashi M and Takahashi S 1985 Structural analysis of Si(111)-7 7 by UFIV-transmission electron diffraction and microscopy J. Vac. Sot Technol. A 3 1502... [Pg.316]

Another mode of electron diffraction, low energy electron diffraction or FEED [13], uses incident beams of electrons with energies below about 100 eV, with corresponding wavelengths of the order of 1 A. Because of the very strong interactions between the incident electrons and tlie atoms in tlie crystal, there is very little penetration of the electron waves into the crystal, so that the diffraction pattern is detemiined entirely by the... [Pg.1367]

The otiier type of noncrystalline solid was discovered in the 1980s in certain rapidly cooled alloy systems. D Shechtman and coworkers [15] observed electron diffraction patterns with sharp spots with fivefold rotational synnnetry, a syimnetry that had been, until that time, assumed to be impossible. It is easy to show that it is impossible to fill two- or tliree-dimensional space with identical objects that have rotational symmetries of orders other than two, tliree, four or six, and it had been assumed that the long-range periodicity necessary to produce a diffraction pattern with sharp spots could only exist in materials made by the stacking of identical unit cells. The materials that produced these diffraction patterns, but clearly could not be crystals, became known as quasicrystals. [Pg.1369]

As noted earlier, most electron diffraction studies are perfonned in a mode of operation of a transmission electron microscope. The electrons are emitted themiionically from a hot cathode and accelerated by the electric field of a conventional electron gun. Because of the very strong interactions between electrons and matter, significant diffracted intensities can also be observed from the molecules of a gas. Again, the source of electrons is a conventional electron gun. [Pg.1379]

Figure Bl.8.6. An electron diffraction pattern looking down the fivefold synnnetry axis of a quasicrystal. Because Friedel s law introduces a centre of synnnetry, the synnnetry of the pattern is tenfold. (Courtesy of L Bendersky.)... Figure Bl.8.6. An electron diffraction pattern looking down the fivefold synnnetry axis of a quasicrystal. Because Friedel s law introduces a centre of synnnetry, the synnnetry of the pattern is tenfold. (Courtesy of L Bendersky.)...
For bulk structural detemiination (see chapter B 1.9). the main teclmique used has been x-ray diffraction (XRD). Several other teclmiques are also available for more specialized applications, including electron diffraction (ED) for thin film structures and gas-phase molecules neutron diffraction (ND) and nuclear magnetic resonance (NMR) for magnetic studies (see chapter B1.12 and chapter B1.13) x-ray absorption fine structure (XAFS) for local structures in small or unstable samples and other spectroscopies to examine local structures in molecules. Electron microscopy also plays an important role, primarily tlirough unaging (see chapter B1.17). [Pg.1751]

We will, in the latter part of this discussion, focus only on those few methods that have been the most productive, with low-energy electron diffraction (FEED) receiving the most attention. Indeed, LEED has been the most successfiil surface stmctiiral method in two quite distinct ways. First, LEED has become an almost universal characterization... [Pg.1751]


See other pages where Electrons diffracted is mentioned: [Pg.117]    [Pg.151]    [Pg.242]    [Pg.242]    [Pg.2]    [Pg.203]    [Pg.302]    [Pg.395]    [Pg.432]    [Pg.559]    [Pg.285]    [Pg.291]    [Pg.938]    [Pg.1264]    [Pg.1361]    [Pg.1367]    [Pg.1369]    [Pg.1380]    [Pg.1625]    [Pg.1625]    [Pg.1632]    [Pg.1647]    [Pg.1648]    [Pg.1681]   
See also in sourсe #XX -- [ Pg.43 ]




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A Diffraction Experiment with Electrons

Adsorption electron diffraction

Antimony electron diffraction

Apparatus, electron diffraction

Auger electron diffraction

Based on Electron Diffraction

Benzene electron diffraction

Bond angle from electron diffraction

Bond energies electron diffraction/photoelectron

Carbon Fibers electron diffraction

Carbon whisker, electron diffraction

Carbon, electron diffraction

Carbon, electron diffraction pattern

Carbon, electron diffraction pattern from

Cellulose electron diffraction investigations

Cellulose electron diffraction pattern

Characterization electron diffraction

Chemical substitutions electron diffraction studies

Convergent (or focused) beam electron diffraction

Convergent beam electron diffraction

Convergent beam electron diffraction CBED)

Convergent-beam electron diffraction LACBED

Convergent-beam electron diffraction factors

Crystalline solids electron diffraction

Crystallinity electron diffraction

Crystals, electron diffraction

Davisson-Germer electron diffraction

Diborane electron diffraction

Diffraction by single crystals electron density determination

Diffraction contrast, electron microscopy

Diffraction electron microdiffraction

Diffraction electron microscopes

Diffraction electron microscopy

Diffraction experiment with electrons

Diffraction high-energy electron

Diffraction low-energy electron

Diffraction measurements electron

Diffraction methods single crystal electron density determination

Diffraction of electrons, neutrons and X-rays

Diffraction of x-rays and electrons

Diffraction reflection high-energy electron

Diffraction scanning high-energy electron

Diffraction with electrons, X-rays, and atoms

Diffraction, amorphous substances electron

Diffraction, by electrons

Diffraction, of electrons

Diffraction, precession electron

Diffuse low energy electron diffraction

Electron - affinity diffraction

Electron Backscattered Diffraction Analysis

Electron Diffraction Data

Electron Diffraction Database

Electron and X-Ray Diffraction Studies

Electron and X-Ray Diffraction Studies of 1,2,3,5-Dithiadiazolyl Radicals

Electron back-scattered diffraction

Electron back-scattered diffraction EBSD)

Electron backscatter diffraction

Electron backscatter diffraction (EBSD) analyses of oxide scale structure

Electron backscattered diffraction

Electron backscattering diffraction

Electron backscattering diffraction EBSD)

Electron beams, diffraction

Electron charge concentration diffraction

Electron diffraction

Electron diffraction

Electron diffraction 1,2,4-trioxolanes

Electron diffraction Electronegativity

Electron diffraction HEED LEED

Electron diffraction advantages

Electron diffraction analysis

Electron diffraction and transmission

Electron diffraction band

Electron diffraction bond energies

Electron diffraction bond lengths

Electron diffraction by crystals

Electron diffraction code

Electron diffraction contrast

Electron diffraction distribution

Electron diffraction electronic conduction

Electron diffraction electronic defects

Electron diffraction energy-loss

Electron diffraction energy-loss spectroscopy, EELS

Electron diffraction example patterns

Electron diffraction experiments

Electron diffraction gallane vapor

Electron diffraction gallium hydrides

Electron diffraction instrument

Electron diffraction insulators

Electron diffraction interpretation

Electron diffraction kaolinite

Electron diffraction kikuchi lines

Electron diffraction lattice imaging

Electron diffraction measurements, cyclic

Electron diffraction methods

Electron diffraction montmorillonite

Electron diffraction operator

Electron diffraction ozonides

Electron diffraction pattern

Electron diffraction pattern analysis

Electron diffraction pattern, mineral

Electron diffraction patterns mordenite crystals

Electron diffraction phosgene

Electron diffraction plate

Electron diffraction semiconductors

Electron diffraction spectroscopy

Electron diffraction structure determination

Electron diffraction structures, accuracy

Electron diffraction studying

Electron diffraction studying molecular aggregation

Electron diffraction studying monolayer

Electron diffraction surface structure

Electron diffraction techniques

Electron diffraction water clusters

Electron diffraction, allyl

Electron diffraction, allyl radical

Electron diffraction, application

Electron diffraction, basis

Electron diffraction, boron hydrides

Electron diffraction, by gases

Electron diffraction, coherence

Electron diffraction, elastic

Electron diffraction, from surfaces

Electron diffraction, gas-phase

Electron diffraction, general

Electron diffraction, general discussion

Electron diffraction, in gases, and

Electron diffraction, reactive intermediates

Electron microscopy and diffraction in heterogeneous catalysis

Electron microscopy diffraction patterns

Electron-Density Distributions Determined by X-Ray Diffraction Methods

Electron-beam back-scattered diffraction

Electronic Diffraction Database

Electronic diffraction

Electronic diffraction

Energy Electron Diffraction

Energy Electron Diffraction (LEED)

Evaluation of Structural Information from Gaseous Electron Diffraction

Ex situ low-energy electron diffraction

Experimental techniques electron diffraction

Ferrihydrite electron diffraction pattern

Films structure electron diffraction methods

From Diffraction Data to Electron Density

From electron diffraction

Gallane electron diffraction

Gallium electron diffraction

Gas electron diffraction

Gas-phase Molecular Structures Determined by Electron Diffraction

Gas-phase electron diffraction, structure

Hydrogen electron diffraction

In electron diffraction studies

Inelastic low-energy electron diffraction

Infrared Spectroscopy and Gas Electron Diffraction

Interpretation of electron diffraction patterns

Kinematical theory of electron diffraction

LEED Electron Diffraction

LEED—See Low energy electron diffraction

Lamellae, electron diffraction

Langmuir-Blodgett films electron diffraction

Large angle convergent beam electron diffraction

Layer lattice compounds electron diffraction

Low Energy Electron Diffraction LEED)

Low angle electron diffraction

Low energy electron diffraction patterns

Low energy electron diffraction. See

Low-energy electron diffraction LEED) patterns

Low-energy electron diffraction intensities

Low-energy electron diffraction methods

Low-energy electron diffraction surface

Low-energy electron diffraction-Auger

Medium - Energy Electron Diffraction MEED)

Medium-energy electron diffraction

Medium-energy electron diffraction, surface

Medium-energy electron diffraction, surface structure

Micro-area electron diffraction

Microwave Spectroscopy and Electron Diffraction

Molecular orbital calculation-constrained electron diffraction

Molecular structure, electron diffraction

Molecular vibration electron diffraction

Molecule Representation of Structures Based on Electron Diffraction

Molecules, electron diffraction

Mononuclear electron diffraction

Multilayer electron diffraction

Nano-beam electron diffraction

Nanobeam electron diffraction

Neutron and Electron Diffraction

OBLIQUE TEXTURE ELECTRON DIFFRACTION (OTED)

Phase electron diffraction pattern

Poly electron diffraction

Poly electron diffraction pattern

Polyethylene electron diffraction

Polyethylene electron diffraction patterns

Polymers, chain type electron diffraction

Properties electron diffraction study

RHEED electron diffraction

Radial distribution function electron diffraction

Ray and Electron Diffraction

Reflectance high-energy electron diffraction

Reflection electron diffraction

Reflection high electron diffraction

Reflection high electron diffraction RHEED)

Reflection high energy electron diffraction, molecular beam epitaxy

Reflection high-energy electron diffraction RHEED

Reflection high-energy electron diffraction surface structure

Results of X-ray and electron diffraction studies

Role of electron powder diffraction in solving structures

Scanning Electron Micrograph and -Ray Diffraction

Scanning transmission electron microscopy diffraction patterns

Scattering in electron diffraction

Selected area electron diffraction

Selected area electron diffraction SAED)

Selected area electron diffraction patterns

Selected area electron diffraction polymers

Selected-area electron diffraction polycrystalline

Single crystals electron diffraction

Spectroscopy low energy electron diffraction

Spot profile analysis low energy electron diffraction

Structural parameters from electron diffraction

Structure determination by electron diffraction

Studies electron diffraction

Surface diffraction electrons

Surfaces reflection high-energy electron diffraction

Symmetry determinations by electron diffraction

The Interplay between Spectroscopy and Electron Diffraction

The electron diffraction camera

Thiourea, electron diffraction studie

TiO2, electron diffraction

Topology of Electron Density in Dihydrogen-Bonded Systems from Diffraction Data

Transmission electron diffraction

Transmission electron diffraction pattern

Transmission electron diffraction techniques

Transmission electron microscopy X-ray diffraction

Transmission electron microscopy diffraction

Transmission electron microscopy diffraction techniques

Ultrafast electron diffraction

Ultrafast electron diffraction, femtosecond time

Valency angles from electron diffraction measurement

Valonia cellulose electron diffraction studies

Water cluster electron diffraction pattern

X-ray diffraction difference electron density map

X-ray diffraction electron density map

X-ray diffraction electron microscopy

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