Determination of Phase Angles and Absolute Values of the Structure Potential V0002of Cadmium Sulfide from Equal Thickness Fringesin Electron Micrographs
Open Access
- 1 July 1977
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 32 (7) , 750-753
- https://doi.org/10.1515/zna-1977-0714
Abstract
Fringe spacings were measured at the three different diffraction conditions: 0002-Bragg position, 0004-Bragg position and the symmetric position for 000l systematic reflections. The absolute value |V0002| and the phase angle Φ0002 were determined by analyzing the ratios of fringe spacings with a 15-beam calculation. The values determined were |V0002| = 6.5 ± 0.5 Volt and tan Φ0002 = -0.54 ± 0.04 on the origin at a cadmium atom. From these values the atom form factors at the position of 0002 reflection were calculated as fx cd = 42.4 ± 0.5 and fx s= 13.0 ±0.2, assuming the parameter u determined by X-ray diffraction.Keywords
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