Accession Number : AD0278811

Title :   SPURIOUS SPECTRAL EFFECTS AND ALIGNMENT PROCEDURES IN X-RAY SPECTROMETRY

Corporate Author : CORNELL UNIV ITHACA N Y

Personal Author(s) : SCHNOPPER,HERBERT W.

Report Date : 15 APR 1962

Pagination or Media Count : 1

Abstract : The spurious spectral effects of (1) vertical divergence and (2) improper spectrometer alignment (crystals and x-ray beam) are discussed. The distortions produced in such spectral features as Bragg angle, line shape, width and asymmetry are illustrated both theoretically and experimentally. A new method is described for aligning the crystals, which makes use of the non-dispersive (1,-1) position, and which is independent of vertical divergence. Significant new conclusions of this study are (1) the crystal alignment and the beam alignment must be treated separately and with equal care, and (2) perfect crystal alignment cannot be conveniently achieved in the presence of vertical divergence. Quantitative discussion is given of the spectral distortions which arise from vertical divergence even for perfect alignment of the crystals and of the x-ray beam. (Author)

Descriptors :   CALCITE, CRYSTALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE