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Measurement of twofold astigmatism of probe-forming lens using low-order zone-axis ronchigram
Koji Kuramochi1, Takashi Yamazaki, Yasutoshi Kotaka
1Department of Physics, Tokyo University of Science, 1-3 Kagurazaka/Shinjuku-ku, Tokyo 162-8601, Japan.
Ultramicroscopy
|June 30, 2007
Abstract:
By using a low-order zone-axis ronchigram of a crystalline sample, a simple method for measuring twofold astigmatism of a probe-forming lens is proposed. This method allows precise measurement of the value of astigmatism from only one experimental ronchigram.