Pauling, Linus and Bjorkeson, Albert (1925) A New Crystal for Wave-Length Measurements of Soft X-Rays. Proceedings of the National Academy of Sciences of the United States of America, 11 (7). pp. 445-447. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas25
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During an investigation of the crystal structures of hematite and corundum spectral photographs of the K-radiation of molybdenum reflected from the plane (00.1) of the hexagonal crystal beta-alumina, Al2O3, were made. One such photograph is shown in the accompanying reproduction. Upon substituting in the equation n[lambda] = 2d sin [theta] the wave-lengths [lambda] of the X-rays used and the corresponding angles of reflection [theta], the grating-constant d was found to be about 11.2 A, assuming that n is unity for the reflection at the smallest angle. This result shows that this substance has an unusually large grating-constant; and, since this is accompanied by strong reflection, the crystal should prove of great value in the measurement of wave-lengths of soft X-rays.
|Additional Information:||Copyright © 1925 by the National Academy of Sciences We wish to thank Dr. A. A. Klein of the Norton Company, Worcester, Mass., for this speciman; also Dr. R. G. Dickinson of this Institute, and Dr. R. W. G. Wyckoff of the Geophysical Laboratory, for supplying us with some crystals, from the same source, used in our preliminary work.|
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|Deposited On:||18 Dec 2005|
|Last Modified:||14 Nov 2014 19:18|
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