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Characterization and application in XRF of HfO2-coated glass monocapillary based on atomic layer deposition |
| Yan-Li Li(李艳丽)1†, Ya-Bing Wang(王亚冰)2,†, Wei-Er Lu(卢维尔)3, Xiang-Dong Kong(孔祥东)1,4,‡, Li Han(韩立)1,4, and Hui-Bin Zhao(赵慧斌)1 |
1 Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
3 Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Coating a glass monocapillary x-ray optics with high-density film is a promising way to improve transmission characteristics. For a long time, it has been a challenge to coat a high-density film in the inside of monocapillary with an extremely high length-to-diameter ratio. In this work, HfO$_{2}$ film is deposited on the inner wall of a tapered glass monocapillary with length 9.9 cm, entrance diameter 596.4 μm, and exit diameter 402.3 μm by atomic layer deposition. The coated and uncoated monocapillaries are studied by the transmission process of x-rays with energy from 5 keV to 100 keV and the x-ray fluorescence (XRF) spectra of a Mo sample are detected. Improved transmission characteristics have been obtained for the HfO$_{2}$-coated monocapillary. The energy upper limit of focused x-rays increases from 18.1 keV to 33.0 keV and the ‘penetration halo’ is suppressed to some extent. The XRF spectrum presents two stronger peaks at $\sim 17.4$ keV and $\sim 19.6$ keV which are considered as the characteristic x-rays of Mo K$_{\alpha }$ and Mo K$_{\beta }$. These results reveal that more higher energy x-rays from the W x-ray tube are totally reflected on the inner wall of the HfO$_{2}$-coated glass monocapillary due to the increase of total reflection critical angle. This work is significant for more applications of monocapillary in higher energy x-ray field.
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Received: 23 September 2020
Revised: 04 November 2020
Accepted manuscript online: 02 December 2020
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PACS:
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07.85.-m
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(X- and γ-ray instruments)
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41.50.+h
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(X-ray beams and x-ray optics)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2018YFF0109100), Fund from the Institute of Electrical Engineering, Chinese Academy of Sciences (Grant No. E1554404), and the National Natural Science Foundation of China (Grant Nos. 11675019 and 11875087). |
Corresponding Authors:
Xiang-Dong Kong
E-mail: slkongxd@mail.iee.ac.cn
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Cite this article:
Yan-Li Li(李艳丽), Ya-Bing Wang(王亚冰), Wei-Er Lu(卢维尔), Xiang-Dong Kong(孔祥东), Li Han(韩立), and Hui-Bin Zhao(赵慧斌) Characterization and application in XRF of HfO2-coated glass monocapillary based on atomic layer deposition 2021 Chin. Phys. B 30 050703
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