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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47324

Title: Study of mean absorptive potential using Lenz model:Toward quantification of phase contrast from an electrostatic phase plate
Authors: F. R. Chen
K. F. Chen
C. S. Chang
J. Shiue
Y. Hwu
W. H. Chang
J. J. Kai
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Electrostatic phase plate
Absorptive potential
Lenz model
Date: 2008-08
Issue Date: 2018-07-16T03:20:09Z
Publisher: MICRON
Abstract: Abstract: An electrostatic phase plate can provide better phase contrast, a fact that plays a promising role for the high-resolution observation of specimens containing light elements. However, in order to quantify the “phase” contrast from images recorded using the phase plate, the “absorption” (or scattering) contrast arising from electrons scattered elastically and inelastically outside of the phase-plate ring must be analyzed. Angular distributions of the elastic and inelastic scattering are predicted using the Lenz model. The mean absorptive potential, serving as an index for the contribution of “absorption” contrast, is calculated from the reciprocal mean free path of elastic and inelastic scattering, and is verified experimentally. The mean absorptive potential of a particular phase plate with inner and outer radii of 0.25 μm (θ1 = 0.09 mrad) and 1 μm (θ2 = 0.4 mrad), respectively, is approximately 0.11 eV for carbon and is equivalent to that of an objective aperture of semiangle 17 mrad (cutoff frequency 6.7 nm−1).
Relation: 39(6) pp.749-756
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47324
Appears in Collections:[光電科學研究所] 期刊論文

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