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从LiF(110) 表面的分子离子脱离通过 pozitron消灭
T Tachibana1, D Hoshi1, Y Nagashima1
1Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan.
Physical review letters
|October 20, 2023
概括
对LiF(110) 表面的 pozitron 辐射使得像FH+和F2+这样的分子离子脱离,与电子辐射不同. 这表明了一种涉及正电子化合物和奥格尔衰变的新型溶解机制.
科学领域:
- 表面科学是一门科学.
- 材料科学是一种材料科学.
- 原子和分子物理学 原子和分子物理学
背景情况:
- 了解离子晶体表面的离子溶解至关重要.
- 电子辐射通常只产生原子离子.
研究的目的:
- 为了研究正子和离子晶体之间的相互作用.
- 使用正子和电子辐射检查LiF(110) 表面的离子脱离.
主要方法:
- 用500 eV的正电子和电子对LiF(110) 晶体表面进行辐射.
- 使用质谱法对被脱离的正离子进行分析.
- 离子产量的温度依赖测量.
主要成果:
- 电子辐射只能使单原子离子 (H+,Li+,F+) 脱离.
- 阳位子辐射诱导了分子离子 (FH+,F2+) 的显著脱离.
- 与原子离子相比,分子离子产量表现出更高的温度灵敏度.
结论:
- 提出了一种新的脱吸模式,涉及到表面正电子化合物的形成.
- pozitron 消灭触发了 Auger 衰变,导致分子离子的脱离.
- 阳位子辐射提供了一种独特的途径,可以从离子表面去吸收分子物种.
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