Published 1957 | Version v1
Miscellaneous Open

Contribution to the study of X ray absorption in the vicinity of the Bragg angle. I - Experimental study; II - Theoretical study

Creators

  • 1. Laboratoire de Chimie-Physique de la Faculte des Sciences de Paris (France)

Description

A first article reports an experimental photographic study of X ray absorption by crystals as X rays travel through these crystals according to a direction which is close to the Bragg incidence. The authors used aluminium crystals and then quartz crystals. The experimental apparatus is described and the resulting spectrographs obtained with curved crystals are discussed (white lines, primary extinction, secondary extinction). Results obtained with plane crystals are then discussed with a presentation of the experimental installation, of the preparation of quartz blades, of the study of transmission lines with respect to preparation. The causes of the evolution of transmission lines are discussed. The study of crystals after bending is reported. The second article reports the application of the crystal dynamic theory, and compares theoretical results with the experimental ones obtained in the case of plane crystals. The author also comments the content of publications published after his works. Articles published in 'Bulletin de la Societe francaise de Mineralogie et de Cristallographie', volume 80, 7-9, 1957, pp. 344-377 and volume 80, 10-12, 1957, pp. 417-438

Abstract (French)

L'etude photographique montre qu'il existe, pour des cristaux plans de quartz, une relation entre l'aspect des lignes dues a la transmission du rayonnement X monochromatique pour lequel l'incidence, sur les plans reticulaires consideres, a lieu sous l'angle de Bragg et la perfection cristalline. Ces lignes, claires pour un cristal imparfait, se bordent d'un trait sombre, correspondant a un maximum d'intensite, qui s'accentue lorsque la perfection croit. Dans certains cas, ces cristaux conservent apres courbure des lignes, dues a la transmission, claires, bordees d'un trait sombre, analogues a celles qu'ils presentaient a l'etat plan, au lieu des lignes claires habituelles. Dans une deuxieme partie, des resultats sont deduits de la theorie dynamique des cristaux et compares aux resultats experimentaux de la premiere partie concernant les cristaux plans. Une rapide mise au point des connaissances actuelles sur le phenomene etudie est ensuite faite a la lumiere des travaux plus recents. Articles publies dans le 'Bulletin de la Societe francaise de Mineralogie et de Cristallographie', volume 80, 7-9, 1957, pp. 344-377 et volume 80, 10-12, 1957, pp. 417-438

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Additional details

Additional titles

Original title (French)
Contribution a l'etude de l'absorption des rayons X au voisinage de l'angle de Bragg. I - Etude experimentale; II - Etude theorique

Identifiers

DOI
10.3406/bulmi.1957.5179;

Publishing Information

Imprint Pagination
58 p.
Report number
INIS-FR--21-0091

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
52011468
Subject category
S36: MATERIALS SCIENCE; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
ABSORPTION; ABSORPTION SPECTROSCOPY; ALUMINIUM; BRAGG CURVE; BRAGG REFLECTION; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; CRYSTALLOGRAPHY; QUARTZ; SHAPE; SLABS; TRANSMISSION; X RADIATION; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY
Descriptors DEC
COHERENT SCATTERING; CRYSTAL STRUCTURE; DIAGRAMS; DIFFRACTION; ELECTROMAGNETIC RADIATION; ELEMENTS; INFORMATION; IONIZING RADIATIONS; METALS; MINERALS; OXIDE MINERALS; RADIATIONS; REFLECTION; SCATTERING; SORPTION; SPECTROSCOPY

Optional Information

Notes
40 refs.; Available from doi: https://doi.org/10.3406/bulmi.1957.5179; Also available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses