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中国原子能科学研究院
收稿日期:1984-03-15,
纸质出版日期:1986-02
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蒋崧生, 崔云峰, 李迁, 等. 静电加速器离子束杂质成分的测定[J]. 核技术, 1986,09(2):34-36,61.
Songsheng Jiang, Yunfeng Cui, Qian Li, et al. Determination of impurity in the ion beams of Van de Graaff accelerator[J]. Nuclear techniques, 1986, 09(2): 34-36,61.
静电加速器广泛应用于离子的X射线分析、背散射、核反应和研究离子与物质的相互作用等等。静电加速器的离子由离子源产生,被端部高压进行加速。离子源所产生的离子往往不是很纯净的。为此,通常依靠磁分析器来排除那些被加速而又不需要的离子,并挑选出所需要的离子。但是,磁分析器要区分开那些荷质比相近的离子是十分困难的。在磁分析器所挑选出的离子束中,往往含有一些荷质比相近的其他离子。例如,在选择氘离子源的D
-
离子中伴随有
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离子;相反在选择氢离子源的
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离子却伴随有D
-
离子。
4
He
+
离子中可能伴随
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和
12
C
3-
离子。离子束中的杂质成分往往被人们所忽视,但在有些情况下,却是不容忽视的。例如,在利用D
-
离子分析表面氢含量时,D
+
离子束中含有
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离子就会直接影响到分析的灵敏度
[1]
;在研究
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离子与固体膜相互作用时
[2]
,
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离子中含有的D
+
离子的数量大小也会影响到测量的精度;在背散射分析、离子溅射、辐照损伤研究以及核反应截面测量时,有时也不能忽视离子束中的杂质成分
[3]
。
In this work Rutherford scattering technique was used to determine the unwanted accelerated ions which have the similar charge-mass ratio to the main required beam after the magnetic analyzer. The principle of this technique
the experimental arrangement
and determinations of
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ions in the D
+
ion beam from deuterium ion source and D
+
ions in the
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ion beam from hydrogen ion source are described.
郭清江 等 , 核物理 , 3 , 211 ( 1983 ).
H. J. Gaillard et al . , Nucl. Instr. Meth. , 132 , 69 ( 1976 ).
Y. C. Liu et al . , Nucl. Instr. Meth. , 152 , 349 ( 1978 ).
蒋崧生 等 , 核技术 , 6 , 8 ( 1984 ).
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