Influence of large angle polepiece on spherical aberration coefficient.
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| Title: | Influence of large angle polepiece on spherical aberration coefficient. |
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| Authors: | Su, Jincan1 (AUTHOR), Hu, Xiaotian1 (AUTHOR), Hu, Tao1 (AUTHOR), Dong, Shigang1 (AUTHOR), Zhang, Jian1 (AUTHOR) zhangjian@xmu.edu.cn, Liu, Yucheng2 (AUTHOR), Chen, Faguo2 (AUTHOR), Zhang, Bingtao2 (AUTHOR) |
| Source: | Journal of Microscopy. Aug2025, Vol. 299 Issue 2, p166-174. 9p. |
| Subjects: | Transmission electron microscopy, Optical aberrations, Azimuth, Finite element method, Design science |
| Abstract: | X‐rays, secondary electrons, and other emitted electrons need to be extracted at a large solid angle to enhance electron collection efficiency in transmission electron microscopy. The finite element method is employed to investigate the effects of different polepiece angles on the spherical aberration coefficient of polepiece. The research findings reveal that the azimuthal angle β of the upper polepiece has a substantial effect on the spherical aberration coefficient. When β = 30°, the minimum spherical aberration coefficient is achieved. When β ≥ 50°, the spherical aberration coefficient increases significantly, which adversely affects imaging. The aperture size of the upper polepiece has a relatively minor effect on the spherical aberration. The design of the large‐angle polepiece offers novel design concepts for future emission X‐ray/electron collection devices, while also offering a new reference for the design of objective lenses in transmission electron microscopy. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Microscopy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Abstract: | X‐rays, secondary electrons, and other emitted electrons need to be extracted at a large solid angle to enhance electron collection efficiency in transmission electron microscopy. The finite element method is employed to investigate the effects of different polepiece angles on the spherical aberration coefficient of polepiece. The research findings reveal that the azimuthal angle β of the upper polepiece has a substantial effect on the spherical aberration coefficient. When β = 30°, the minimum spherical aberration coefficient is achieved. When β ≥ 50°, the spherical aberration coefficient increases significantly, which adversely affects imaging. The aperture size of the upper polepiece has a relatively minor effect on the spherical aberration. The design of the large‐angle polepiece offers novel design concepts for future emission X‐ray/electron collection devices, while also offering a new reference for the design of objective lenses in transmission electron microscopy. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00222720 |
| DOI: | 10.1111/jmi.13430 |
