Measurement of twofold astigmatism of probe-forming lens using low-order zone-axis ronchigram.
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.
Kuramochi
Koji
K
Department of Physics, Tokyo University of Science, 1-3 Kagurazaka/Shinjuku-ku, Tokyo 162-8601, Japan.
Yamazaki
Takashi
T
Kotaka
Yasutoshi
Y
Kikuchi
Yoshio
Y
Hashimoto
Iwao
I
Watanabe
Kazuto
K