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A Point Focusing X-Ray Monochromator for the Study of Low Angle Diffraction

Shenfil, Leon and Danielson, Warren E. and DuMond, Jesse W. M. (1952) A Point Focusing X-Ray Monochromator for the Study of Low Angle Diffraction. Journal of Applied Physics, 23 (8). pp. 854-859. ISSN 0021-8979. doi:10.1063/1.1702319.

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A point focusing x‐ray monochromator was designed and constructed for low angle scattering studies. The anastigmatic point focus is achieved by means of two cylindrically bent quartz crystals whose focal circles are mutually perpendicular. The beam, emanating from the copper target of an x‐ray tube, is reflected in succession, first from the crystal defining the horizontal focal circle, and second from the crystal defining the vertical focal circle following which it comes to a monochromatic point focus of wavelength 1.537A (CuKα_1). The sample to be studied is placed between the second crystal and the point focus, and the scattered beam is detected by means of a photographic film placed at the point focus, at right angles to the undeviated beam, the latter being suppressed by means of an absorber, or allowed to pass through a hole in the film. Mathematical analysis, in which a ray was traced through the two‐crystal system, revealed correctly the shape and size of the point focus, and the possibility of reducing the latter in size by stopping down the beam emerging from the target.

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Additional Information:© 1952 The American Institute of Physics. (Received February 18, 1952) This work was performed and financed under the joint sponsorship of the ONR and the AEC by contract with the California Institute of Technology. In conclusion we wish to express our gratitude to the ONR for their generous support and sponsorship of the development of this instrument and to Professor Linus Pauling of this Institute for his faith in and support of the project in recommending it to its present sponsors when its success was still problematical. We are also most grateful for the friendly advice and cooperation of Professor R. B. Corey of the C.LT. Chemistry Department and to Professors J. Weigle and G. W. Beadle of the C.I.T. Biology Department for most helpful advice and discussions regarding possible problems suitable for the new instrument.
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Office of Naval Research (ONR)UNSPECIFIED
Atomic Energy CommissionUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20140621-115706810
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46412
Deposited By: George Porter
Deposited On:23 Jun 2014 16:31
Last Modified:10 Nov 2021 17:25

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