期刊
ULTRAMICROSCOPY
卷 99, 期 2-3, 页码 115-123出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2003.11.001
关键词
high-resolution electron microscopy; image restoration; wave aberration function
类别
A new method is presented for the determination of the antisymmetric coefficients of the wave aberration function from a tableau of tilted illumination images. The approach is based on measurements of the apparent defocus and twofold astigmatism using a phase correlation function and phase contrast index calculated from a short focus series acquired at each tilt. This method is shown to be suitable for a wide range of specimens and is sufficiently accurate for exit plane wave restoration at 0.1 nm resolution. Experimental examples of this approach are provided and the method is compared to results obtained from measurements of conventional power spectra. (C) 2003 Elsevier B.V. All rights reserved.
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