Search results
Results from the WOW.Com Content Network
Light atoms usually show only a small anomalous dispersion effect. In this case, the Flack parameter can refine to a physically unrealistic value (less than 0 or greater than 1) and has no meaning. This parameter, introduced by H. D. Flack [1] became one of a standard set of values being checked for structures with noncentrosymmetric space groups.
This choice also places K-alpha firmly in the X-ray energy range. Similarly to Lyman-alpha, the K-alpha emission is composed of two spectral lines, K-alpha 1 (Kα 1) and K-alpha 2 (Kα 2). [6] The K-alpha 1 emission is slightly higher in energy (and, thus, has a lower wavelength) than the K-alpha 2 emission.
[1] In general the X-ray form factor is complex but the imaginary components only become large near an absorption edge. Anomalous X-ray scattering makes use of the variation of the form factor close to an absorption edge to vary the scattering power of specific atoms in the sample by changing the energy of the incident x-rays hence enabling the ...
In structural biology, resolution can be broken down into 4 groups: (1) sub-atomic, when information about the electron density is obtained and quantum effects can be studied, (2) atomic, individual atoms are visible and an accurate three-dimensional model can be constructed, (3) helical, secondary structure, such as alpha helices and beta sheets; RNA helices (in ribosomes), (4) domain, no ...
The 2 cm Flak 38 auf Panzer I Ausführung A, commonly known as the Flakpanzer I, [1] was a rare self-propelled anti-aircraft gun conversion of the Panzer I in use by the military of Nazi Germany during World War II.
High-energy X-rays or HEX-rays are very hard X-rays, with typical energies of 80–1000 keV (1 MeV), about one order of magnitude higher than conventional X-rays used for X-ray crystallography (and well into gamma-ray energies over 120 keV).
There are several types of X-ray diffractometer, depending on the research field (material sciences, powder diffraction, life sciences, structural biology, etc.) and the experimental environment, if it is a laboratory with its home X-ray source or a Synchrotron. In laboratory, diffractometers are usually an "all in one" equipment, including the ...
Beside being towed, the Flak 30/38 could be mounted on a variety of vehicles, ranging from being mounted on the rear platform of cars, trucks and half-tracks, including vehicles such as the Sd.Kfz. 10/4 and 10/5 (Flak 30 / Flak 38), Sd.Kfz. 11/1 (Flak 38) to being used for dedicated anti-air vehicles such as Flakpanzer I and Flakpanzer 38(t).