离子像 meaning in English

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Research on their field emission characteristics with fem and fim is helpful to the understanding of their field emission mechanism and the relationship of their end structures with their field emission properties . two methods of assembling swnts on tungsten tips such as physical method and chemical method were provided . the influence of different assembling methods on their field emission characteristics was analyzed
本文给出了将单壁碳纳米管组装到钨针尖上的两种方法，即物理组装方法和化学组装方法，并分析了不同组装方法对单壁碳纳米管场发射特性的影响，讨论了单壁碳纳米管场发射像与场离子像之间的对应关系以及单壁碳纳米管场发射电流的稳定性及其影响因素等。