电子原子碰撞K壳层电离截面研究

原子核物理评论 , 2003, 20(4): 268-276. doi: 10.3969/j.issn.1007-4627.2003.04.009

电子原子碰撞K壳层电离截面研究

安竹 ^1, , 刘慢天 ^2, , 唐昶环 ^3, , 付玉川 ^4, , 彭秀峰 ^5, , 何福庆 ^6, , 罗正明 ^7,

1.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

2.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

3.中国工程物理研究院激光聚变研究中心,四川,绵阳,621900

4.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

5.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

6.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

7.四川大学辐射物理及技术教育部重点实验室,四川大学原子核科学技术研究所,四川,成都,610064

基金项目: 国家自然科学基金(10276029) 高等学校博士学科点专项科研项目(20020610019)

关键词：电子原子碰撞 , K壳层电离截面 , 卢瑟福背散射 , 蒙特卡罗模拟

Study of K-shell Ionization Cross-sections of Atoms by Electron Impact

Keywords： electron impact , K-shell ionization cross-section , Rutherford backscattering spectroscopy , Monte Carlo simulation

近年来, 研究组发展了一套利用厚衬底薄靶测量电子原子碰撞内壳层电离截面的方法. 该方法具有避免制作自支撑薄靶困难的优点. 最近, 又采取了一些措施来提高该方法测量数据的精度. 首先评述了近年来该领域的一些研究进展, 并通过测量Cr元素在小于26 keV能量范围K壳层电离截面的例子介绍了研究组的实验方法. 同时, 也对8种低Z元素和16种中﹑高Z元素在keV能区的实验数据和理论模型﹑经验公式进行了比较, 并对目前电子原子碰撞K壳层电离截面的实验测量和理论研究的现状及需进一步开展的工作进行了讨论.

In this paper, we give a description of recent progress on the measurements of electron-impact K-shell ionization cross-sections of atoms in the keV energy range. We present our experimental method of using thin targets with thick substrates and our measurements taken recently to improve the accuracy of the experimental data by an example of measuring K-shell ionization cross-section for Cr element within the incident energy of less than 26 keV. We also compare the K-shell experimental data sets available for 8 low-Z elements and 16 medium- and higher-Z elements in the keV energy range with some theoretical models and empirical formulae. The general comments on the status of measurement and comparison with theories for atomic K-shell ionization cross-section by electron impact are given.

参考文献

[1]	Powell C J. Cross Sections for Ionization of Inner-shell Electrons by Electrons [J]. Rev Mod Phys, 1976, 48: 33.
[2]	Powell C J. Innershell Ionization Cross Sections [M]. In: Mrk T D and Dunn G H ed. Electron Impact Ionization . New York: Springer- Verlag, 1985, Ch. 6, 198-231.
[3]	Powell C J. Cross Sections for Inner-shell Ionization by Electron Impact [Z]. Private communications, 1998.
[4]	An Z, Luo Z, Tang C. Study of Cross-sections for the K-shell Ionization of Atoms by Electron and Positron Impact [J]. Nucl Instr and Meth, 2001, B179: 334 and references therein.
[5]	Luo Z, Tang C, An Z, et al. Selenium and Yttrium K-shell Ionization Cross-sections by Electron Impact[J]. Phys Rev, 2001, A63: 034702.
[6]	Tang C, Luo Z, An Z, et al. L-shell Ionization Study of Indium, Tin, and Rhenium by Low-energy Electron Impact [J]. Phys Rev, 2002, A65: 052707.
[7]	Llovet X, Merlet C, Salvat F. Measurement of K-shell Ionization Cross Sections of Cr, Ni, and Cu by Impact of 6.5-40 keV electrons [J]. J Phys, 2000, B33: 3 761.
[8]	Llovet X, Merlet C, Salvat F. Measurements of Absolute Cross Sections for K-shell Ionization of Fe and Mn by Electron Impact [J]. J Phys, 2002, B35: 973 and references therein.
[9]	Campos C S, Vasconcellos M A Z, Llovet X, et al. Measurement of L-shell X-ray Production Cross Sections of W, Pt, and Au by 10-30 keV Electron [J]. Phys Rev, 2002, A66: 012719.
[10]	Shanker R, Hippler R. Characteristic and Non-characteristic X-ray Emission from SF6 and SO2 Molecules by Electron Impact [J]. Z Phys, 1997, D42: 161.
[11]	Schneider H, Tobehn I, Ebel F, et al. Absolute Cross Sections for Inner Shell Ionization by Lepton Impact [J]. Phys Rev Lett, 1993, 71: 2 707.
[12]	Khare S P, Wadehra J M. K-, L-, and M-shells Ionization of Atoms by Electron and Positron Impact [J]. Can J Phys, 1996, 74: 376.
[13]	Luo S. Study of Electron-specimen Interactions [D]. Ph D Thesis. Knoxville: The University of Tennessee, 1994.
[14]	Long X, Liu M, He F, et al. Cross Sections for K-shell Ionization by Electron Impact [J]. At Data Nucl Data Tables, 1990, 45: 353.
[15]	Joy D C. A Database on Electron-solid Interactions [J]. Scanning, 1995, 175: 270 (available from http://web. utk. edu/～srcutk).
[16]	An Z, Liu M T, Fu Y C, et al. Some Recent Progress on the Measurement of K-shell Ionization Cross-sections of Atoms by Electron Impact: Application to Ti and Cr elements [J]. Nucl Instr and Meth, 2003, B207: 268.
[17]	Hippler R. Plane Wave Born Calculations of K-shell Ionization at Low Velocities [J]. Phys Lett, 1990, A144: 81.
[18]	Mayol R, Salvat F. Cross Sections for K-shell Ionisation by Electron Impact [J]. J Phys, 1990, B23: 2 117.
[19]	Casnati E, Tartari A, Baraldi C. An Empirical Approach to K-shell Ionisation Cross section by Electrons [J]. J Phys, 1982, B15: 155.
[20]	Quarles C A, Estep L. Chemical Effects in the K X-ray Yield of Sulfur [J]. Phys Rev, 1986, A34: 2 488.
[21]	Liu M, An Z, Tang C, et al. Experimental Electron-impact K-shell Ionization Cross Sections [J]. At Data Nucl Data Tables, 2000, 76: 213 (Revised version by An Z available from http://inst. scu. edu. cn).
[22]	Bethe H A. Zur Theorie des Durchgangs Schnelleer Korpurkularstrahlen durch Materie [J]. Ann Physik, 1930, 5: 325.
[23]	Gryzinski M. Classical Theory of Atomic Collisions. I: Theory of inelastic collisions [J]. Phys Rev, 1965, A138: 336.
[24]	Hombourger C. An Empirical Expression for K-shell Ionization Cross Section by Electron Impact [J]. J Phys, 1998, B31: 3 693.
[25]	Deutsch H, Becker K, Mrk T D. Improved Low-energy Dependence of Calculated Cross Sections for the K-shell Ionization of Atoms Using the Deutsch-Mrk Formalism [J]. Int J Mass Spectrom, 1998, 177: 47.
[26]	Saarilahti J, Rauhala E. Interactive Personal-computer Data Analysis of Ion Backscattering Spectra [J]. Nucl Instr and Meth, 1992, B64: 734.
[27]	An Z, Liu M. On the Efficiency Calibration of Si(Li) Detector in the Low-energy Region Using ThicK-target Bremsstrahlung [J]. Nucl Instr and Meth, 2002, B194: 513.
[28]	Tschischgale J, Küchler D, Lehnert U, et al. Efficiency Calibration of a Si(Li) Detector in the Low-energy Region Using Electron Bremsstrahlung [J]. Nucl Instr and Meth, 1997, A400: 387.
[29]	Wolters U, Meyer D, Wiesemann K. Low-energy Intensity Calibration of a Si(Li) Detector Using Thick-target Bremsstrahlung [J]. J Phys, 1998, D31: 2 112.
[30]	Salvat F, Fernandez-Varea J M, Acosta E, et al. PENELOPE, a Code System for Monte Carlo Simulation of Electron and Photon Transport [R]. Paris: NEA/NSC/DOC(2001)19, 2001.
[31]	Acosta E, Llovet X, Salvat F. Monte Carlo Simulation of Bremsstrahlung Emission by Electrons [J]. Appl Phys Lett, 2002, 80: 3 228.
[32]	Kissel L, Quarles C A, Pratt R H. Shape Functions for Atomic-field Bremsstrahlung from Electrons of Kinetic Energy 1-500 keV on Selected Neutral Atoms 1 ≤Z ≤92 [J]. At Data Nucl Data Tables, 1983, 28: 381.
[33]	Nelson W R, Hirayama H, Rogers D W O. The EGS4 Code System [R]. SLAC-Report-265, Stanford Linear Accelerator Center, 1985.
[34]	Luo Z, An Z, He F, et al. Correction of the Influence of the Substrate upon the Measurement of K-shell Ionization Cross Section [J]. J Phys, 1996, B29: 4 001.
[35]	Hubbell J H, Trehan P N, Singh N, et al. A Review, Bibliography, and Tabulation of K, L, and Higher Atomic Shell X-ray Fluorescence Yields [J]. J Phys Chem Ref Data, 1994, 23: 339.
[36]	Khan M R, Karimi M. Kβ/Kα Ratios in Energy-dispersive X-ray Emission Analysis [J]. X-ray Spectrom, 1980, 9: 32.
[37]	He F, Peng X, Long X, et al. K-shell Ionization Cross Sections by Electron Bombardment at Low Energies [J]. Nucl Instr and Meth, 1997, B129: 445.

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网