絞り径

aperture diameter

[目次：レンズ系]

レンズ絞りの直径。コンデンサー絞りの径は照射ビームの開き角を決定し、対物絞りの径はTEM像の結像に用いる透過波や回折波の数(出射電子の散乱角)を決め、制限視野絞りの径は回折図形を得る領域を決める。

A diameter of a lens aperture. The condense-aperture diameter determines the divergence angle of an electron beam. The objective-aperture diameter determines scattering angle of electrons exiting from a specimen (the number of diffracted beams used for forming a TEM image). The selector-aperture diameter determines an area from which a diffraction pattern is obtained.

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