| 扫描隧道显微镜中场蒸发过程的理论分析 |
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| 引用本文： | 李志扬,刘 武,李兴教.扫描隧道显微镜中场蒸发过程的理论分析[J].物理学报,1998,47(8):1383-1390. |
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| 作者姓名： | 李志扬 刘 武 李兴教 |
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| 作者单位： | (1)华中理工大学固体电子学系，武汉 430074; (2)华中师范大学物理系，武汉 430079 |
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| 基金项目： | 国家自然科学基金(批准号：29403020)和武汉工业大学材料复合新技术国家重点实验室资助的课题. |
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| 摘 要： | 从电热动力学(Electrothermodynamics)角度出发，分析了扫描隧道显微镜(STM)中场蒸发过程.引入了一个有效结合能，并推导得到了STM中的蒸发场强计算公式.用该公式计算得到了与实验一致的金离子的蒸发场强.同时发现传统的电荷交换模型与成象势垒模型，由于它们要求被蒸发原子完全电离并被蒸发到无穷远处，因而对STM计算的蒸发场强偏高.
关键词：
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| 关 键 词： | 蒸发场强 扫描隧道显微镜 场蒸发过程 |
| 收稿时间： | 1997-10-31 |
A THEORETICAL ANALYSIS OF THE FIELD EVAPORATION IN THE CONFIGURATION OF SCANNING TUNNELING MICROSCOPE |
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| LI ZHI-YANG,LIU WU and LI XING-JIAO.A THEORETICAL ANALYSIS OF THE FIELD EVAPORATION IN THE CONFIGURATION OF SCANNING TUNNELING MICROSCOPE[J].Acta Physica Sinica,1998,47(8):1383-1390. |
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| Authors: | LI ZHI-YANG LIU WU and LI XING-JIAO |
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| Abstract: | An electrothermodynamic analysis of field evaporation in the configuration of scanning tunneling microscope(STM) has been performed. By introduction of an effective binding energy, a formula for the evaporation field in STM has been constructed. The calculated evaporation field for Au-1, for the first time to our knowledge, agrees well with experiment. On the other hand it was found that the classic charge exchange model and image hump model yield very high evaporation field because they require that the adatoms be fully ionized and evaporated to infinity. |
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