O2+离子穿过碳膜引起的前后表面电子发射

原子核物理评论 , 2014, (1): 92-95. doi: 10.11804/NuclPhysRev.31.01.092

O2+离子穿过碳膜引起的前后表面电子发射

虞洋 ^1, , 赵永涛 ^2, , 王瑜玉 ^3, , 王兴 ^4, , 程锐 ^5, , 周贤明 ^6, , 李永峰 ^7, , 刘世东 ^8, , 雷瑜 ^9, , 孙渊博 ^10,

1.中国科学院近代物理研究所，兰州 730000; 中国科学院大学，北京 100049

2.中国科学院近代物理研究所,兰州,730000

3.中国科学院近代物理研究所,兰州,730000

4.中国科学院近代物理研究所,兰州,730000

5.中国科学院近代物理研究所,兰州,730000

6.中国科学院近代物理研究所,兰州,730000

7.中国科学院近代物理研究所，兰州 730000; 中国科学院大学，北京 100049

8.中国科学院近代物理研究所，兰州 730000; 中国科学院大学，北京 100049

9.中国科学院近代物理研究所,兰州,730000

10.中国科学院近代物理研究所,兰州,730000

基金项目: National Natural Science-Foundation of China(11075192,11105192,11275241,11275238,11205225) 国家重点基础研究发展计划项目(973计划)(2010CB832902)；国家自然科学基金资助项目(11075192,11105192,11275241,11275238,11205225)@@@@ National Basic Research Program of China(973 Program)(2010CB832902)

关键词：电子发射 , 电子能损 , 离子束流强度

Forward and Backward Secondary Electron Emission from Carbon Foils by O2+ Ion

Keywords： electron emission , electronic energy loss , ion beam intensity

测量了入射能为1.9～11.3 keV/u的O2+离子穿过碳膜诱导的前向、后向(分别对应出射表面和入射表面)电子发射产额。实验中，通过改变入射离子的能量和流强，系统地研究了电子能损和离子束流强度对前向、后向电子发射产额的影响。结果表明，在本实验的能量范围内，前向、后向电子发射产额与对应表面的电子能损有近似的正比关系，而与束流强度无关。分析还发现引起后向电子发射的动能阈值约为0.2 keV/u，势能电子发射产额约为1 e-/ion。

We have measured the secondary electron emission yields in forward and backward directions from the carbon foils, which are penetrated by O2+ion of the energy form 1.9 to 11.3 keV/u. In the experiment, the role of electronic energy loss and ion beam intensity in forward and backward electron emission yields have been systematically studied by changing the projectile ion energy and ion beam intensity. The results show that, forward and backward electron emission yields are approximately proportional to the electron energy loss at the exit surfaces and entrance surfaces respectively, and they are independent of the ion beam intensity. Further analyses show that, the kinetic energy threshold for the backward electron emission is about 0.2 keV/u, where the electron emission yield due to the potential energy deposition was roughly 1 e-/ion in the experiment.

参考文献

[1]	赵永涛;肖国青;徐忠锋;Abdul Qayyum;王瑜玉;张小安;李福利;詹文龙.高电荷态离子40Arq+与Si表面作用中的电子发射产额[J].物理学报,2007(10):5734-5738.
[2]	WANG Yuyu;SUN Jianrong;ZHAO Yongtao.[J].NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACT,2013317:33.
[3]	WANG Xing;ZHAO Yongtao;CHENG Rui.[J].Acta Phys Sin,201261(19):193201.
[4]	李德慧;赵永涛;王瑜玉;赵迪;肖国青;QAYYUM A.低速多电荷态离子He2+、O2+和Ne2+与W靶表面相互作用的动能电子发射研究[J].原子与分子物理学报,2008(4):777-781.
[5]	Ritzau SM.;Baragiola RA..Electron emission from carbon foils induced by keV ions[J].Physical Review.B.Condensed Matter,19985(5):2529-2538.
[6]	肖国青.快重离子在固体中引起的电子发射[J].原子核物理评论,2000(03):159-164.
[7]	Clouvas A.;Rothard H.;Hofmann D.;Wunsch R.;Groeneveld KO.;Katsanos A.;Xenoulis AC.;Potiriadis C..ROLE OF PROJECTILE ELECTRONS IN SECONDARY ELECTRON EMISSION FROM SOLID SURFACES UNDER FAST-ION BOMBARDMENT[J].Physical Review.B.Condensed Matter,199718(18):12086-12098.
[8]	JUNG M;ROTHARD H;GERVAIS B.[J].Physical Review A,199654(05):4153.
[9]	ROTHARD H;CARABY C;CASSIMI A.[J].Physical Review A,199551(04):3066.
[10]	赵永涛;肖国青;张小安;杨治虎;陈熙萌;张艳萍.用于高电荷态离子与表面相互作用研究的原子物理实验平台[J].原子与分子物理学报,2006(1):23-26.
[11]	肖国青;赵永涛;张小安;王瑜玉;房燕;马新文;杨治虎;李福利;陈熙萌;王铁山;詹文龙.320KV-ECR离子源表面物理实验终端[J].原子与分子物理学报,2006(z1):175-178.
[12]	ZIEGLER J F;ZIEGLER M D;BIERSACK J P .SRIM[EB/OL].http://www.srim.org,2012-08-01.
[13]	SCHOU J.[J].Physical Review B:Condensed Matter,198022(05):2141.
[14]	WANG Yuyu;ZHAO Yongtao;SUN Jianrong.[J].NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACT,2011269:977.

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