Secondary-electron emission from porous solids.
Secondary-electron emission from porous solids.
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多孔固体的二次电子发射。
DOI：
10.1103/physreva.52.433
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Lafon
中科院分区：
文献类型：
--
作者：
Millet;Lafon
多孔结构可以强烈地改变受到高能电子轰击的材料的电行为：由于这些孔的尺寸小，强电场（10 8V/m）可以在孔内生长。我们给出了一个模型的多孔材料，使我们能够强调和说明的二次电子发射的产率的增强（和扩大其分布的频率）在多孔介质中，相比，在散装材料。在这里，我们已经考虑了天体物理学上感兴趣的材料[石墨、铁、铝（Al 2 O3）和二氧化硅].这种增强的特征在于初级电子的小能量具有两个发射峰，并且对于大能量（> 1 keV），产率大约增加4倍。
Porous structure can strongly change the electric behavior of material submitted to bombardment by energetic electrons: strong electric fields (10 8 V/m) can grow within the pores, because of the small sizes of these pores. We give a model of porous material that enables us to emphasize and illustrate the enhancement of the yield of secondary-electron emission (and the broadening in frequency of its profile) in a porous medium, compared to that in bulk material. Here we have considered materials of astrophysical interest [graphite, iron, aluminum (Al 2 O 3), and silica]. The enhancement is characterized by two emission peaks for small energies of the primary electrons and by an increase of the yield roughly by a factor of 4 for large energies (> 1 keV).