Results 321 to 330 of about 4,274,938 (365)

Electron Diffraction and Crystallography

2001
Reciprocal lattices of materials are spanned by three reciprocal-lattice vectors, so the diffraction patterns of materials are inherently three-dimensional. To obtain all available diffraction information, the diffraction intensity should be measured for all magnitudes and orientations of the three-dimensional diffraction vector, Δ k, with coordinates ...
Brent Fultz, James M. Howe
openaire   +2 more sources

Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction

, 2018
The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis.
T. Wolf, D. Sanchez, J. Yang, R. Parrish, J. P. Nunes, M. Centurion, R. Coffee, J. Cryan, M. Gühr, K. Hegazy, A. Kirrander, R. Li, J. Ruddock, X. Shen, T. Vecchione, S. Weathersby, P. Weber, K. Wilkin, H. Yong, Q. Zheng, X. Wang, M. Minitti, T. Martínez   +22 more
semanticscholar   +1 more source

3D electron diffraction techniques.

Acta Crystallographica. Section B: Structural Science, Crystal Engineering and Materials, 2019
3D electron diffraction is an emerging technique for the structural analysis of nanocrystals. The challenges that 3D electron diffraction has to face for providing reliable data for structure solution and the different ways of overcoming these challenges
M. Gemmi, A. Lanza
semanticscholar   +1 more source

Electron diffraction of membranes

Biophysik, 1971
Electron diffraction conducted on myelin membranes, photosynthetic and photoreceptor membranes yielded spot diffraction patterns indicating an ordered state of membranes; the interplanar spacings being of the order of A units. It was observed, too, that a membrane specimen accommodates different space structures. Based on these findings it is suggested
openaire   +3 more sources

Electron-diffraction transistors

Proceedings., IEEE/Cornell Conference on Advanced Concepts in High Speed Semiconductor Devices and Circuits, 2003
The design, fabrication, and applications of QUADFETs (quantum diffraction field effect transistors) are described. The QUADFETs will enable Fraunhofer diffraction to be demonstrated and exploited. These devices are high-electron-mobility transistors (HEMTs), in which the source and a specially formed drain perform the functions of the light source and
Alfred M. Kriman, Gary H. Bernstein
openaire   +2 more sources

Inelastic diffraction of electrons

AIP Conference Proceedings, 1996
We have measured the angular distribution of electrons reflected from Cu(001) having excited: i) an interband transition, ii) a plasmon, and iii) a core electron. We have found that the angular patterns in cases i) and ii) are similar to the angular pattern of elastically reflected electrons; in particular, the inelastic electrons are reflected along ...
G. Zampieri, M. A. Vicente Alvarez, Hugo Ascolani   +2 more
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Picosecond electron diffraction

Applied Physics Letters, 1982
A picosecond photoelectron pulse generated by a streak camera has been used to probe a thin film of aluminum producing a diffraction pattern representative of its lattice structure. Because this photoelectron pulse is in picosecond synchronism with the optical pulse, this technique will make possible the investigation of structural phase transitions in
S. Williamson, Gerard Mourou
openaire   +2 more sources

Establishing electron diffraction in chemical crystallography

Nature Reviews Chemistry, 2021
T. Gruene, J. Holstein, G. Clever, B. Keppler   +3 more
semanticscholar   +1 more source

Electron Diffraction Intensities

Nature, 1941
UNDER this title, Fordham1 has discussed the intensity anomalies observed by us in the electron diffraction pattern of zinc oxide. Fordham believes that “variations in extinction due to irregular crystal shape or to anisotropy will explain at least qualitatively many of the observed differences between calculated and observed electron diffraction ...
K. Lark–Horovitz, H. J. Yearian
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Electron Diffraction by Gases

The Journal of Chemical Physics, 1935
The method of electron diffraction is used for determining the C–O–C valence angle (α) in 4,4′ diiododiphenyl ether [(C6H4I)2O] and the molecular structures of phosphorus (P4) and arsenic (As4). The electron diffraction photographs were analyzed by four different methods as follows: (1) Visual measurements, (2) measurements of densitometer records, (3)
V. M. Mosley, Louis R. Maxwell, Sterling B. Hendricks   +2 more
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