Aberrations of Magnetic Lens having Bell-shaped Field with various Degree of Asymmetry
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The object of this paper is the improvement of the resolution of the electron microscope by means of magnetic lens having bell-shaped field with various degree of asymmetry.<BR>The author profoundly investigated the spherical constant and the chromatic aberration constant of this lens, and obtained that the desired degree of asymmetry are R<SUB>1</SUB>/R<SUB>2</SUB>1/4 and R<SUB>1</SUB>/R<SUB>2</SUB>=1/1⋅5, where R<SUB>1</SUB> R<SUB>2</SUB> are the half field strength distances in the front and rear direction respectively, and in this case the spherical aberration and the chromatic aberration are minimum respectively.<BR>Hence, he obtained the results that the resolution can be made as small as 1 (mμ) by suitable choice of R<SUB>1</SUB>/R<SUB>2</SUB>.
- 公益社団法人 日本顕微鏡学会の論文
公益社団法人 日本顕微鏡学会 | 論文
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