Bragg-Vulf Condition

Bragg-Vul’f Condition

a condition determining the position of the interference maximums of X rays that are scattered by a crystal without a change in wavelength. The Bragg-Vul’f condition was established independently in 1913 by two scientists, the Englishman W. L. Bragg and the Russian G. V. Vul’f, shortly after the German scientist M. von Laue and his colleagues discovered the diffraction of X rays. According to the Bragg-Vul’f theory, the maximums arise upon the reflection of X rays from a system of parallel crystallographic planes when the beams reflected by the various planes in the parallel system have a path difference equal to

Figure 1

a whole number of wavelengths. The Bragg-Vul’f condition may be expressed as follows:

2d sin θ = mλ

where d is the distance between planes, θ is the Bragg angle (the angle between the reflecting plane and the incident beam), λ is the wavelength of the X radiation, and m is the so-called order of reflection, which is a positive whole number (see Figure 1).

The Bragg-Vul’f condition is fulfilled in cases of the scattering by crystals not only of gamma rays but also of X rays, as well as the diffraction of electrons, protons, and neutrons.

单词	bragg-vulf condition
释义	Bragg-Vulf Condition Bragg-Vul’f Condition a condition determining the position of the interference maximums of X rays that are scattered by a crystal without a change in wavelength. The Bragg-Vul’f condition was established independently in 1913 by two scientists, the Englishman W. L. Bragg and the Russian G. V. Vul’f, shortly after the German scientist M. von Laue and his colleagues discovered the diffraction of X rays. According to the Bragg-Vul’f theory, the maximums arise upon the reflection of X rays from a system of parallel crystallographic planes when the beams reflected by the various planes in the parallel system have a path difference equal to Figure 1 a whole number of wavelengths. The Bragg-Vul’f condition may be expressed as follows: 2d sin θ = mλ where d is the distance between planes, θ is the Bragg angle (the angle between the reflecting plane and the incident beam), λ is the wavelength of the X radiation, and m is the so-called order of reflection, which is a positive whole number (see Figure 1). The Bragg-Vul’f condition is fulfilled in cases of the scattering by crystals not only of gamma rays but also of X rays, as well as the diffraction of electrons, protons, and neutrons.
随便看	revoked individual retirement accounts revoked ira revoked iras revokement revoker revokers revokes revoking revokingly revolade revoliutsiia 1905–1907 godov v rossii revoliutsiia i tserkov revoliutsii peak revoliutsionnaia rossiia revoloution revoloutionary revolt revolt against revolt against (someone or something) revolted revolted against revolted at revolted at (someone or something) revolted by revolted by (someone or something)