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scanning electron microscope;SEM (扫描电子显微镜)
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scanning electron microscope;SEM (扫描电子显微镜)
时间:2021-09-02 20:40
关键词:
细胞生物研究方法
大学试题
理学
答案解析
<p> 是1965年发明的较现代的细胞生物学研究工具,主要是利用二次电子信号成像来观察样品的表面形态,即用极狭窄的电子束去扫描样品,通过电子束与样品的相互作用产生各种效应,其中主要是样品的二次电子发射。二次电子能够产生样品表面放大的形貌像,这个像是在样品被扫描时按时序建立起来的,即使用逐点成像的方法获得放大像。扫描电子显微镜的制造是依据电子与物质的相互作用。</p>
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