HIGH-ENERGY ANGLE-RESOLVED SECONDARY-ELECTRON EMISSION-SPECTROSCOPY OF HIGHLY ORIENTED PYROLYTIC-GRAPHITE
HIGH-ENERGY ANGLE-RESOLVED SECONDARY-ELECTRON EMISSION-SPECTROSCOPY OF HIGHLY ORIENTED PYROLYTIC-GRAPHITE
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DOI：
10.1088/0953-8984/2/40/010
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发表时间：
1990-10-08
影响因子：
2.7
通讯作者：
PRAWER, S
中科院分区：
文献类型：
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作者：
HOFFMAN, A;NYBERG, GL;PRAWER, S
在 7-70 eV 电子动能范围内测量了高度取向热解石墨的角分辨二次电子发射 (ARSEE) 光谱。在大约 = 59 eV 处观察到的峰值，K/sub///= 1.35-1.65 AA-1 在基于自由电子抛物线的半经验方法中得到初步解释，该抛物线的内部电势为 -16.2 eV（相对于真空能级），在 59 eV 处穿过 M 点。从自由电子抛物线与区域中心的交叉处独立描述了 16 eV 和 28.5 eV 处的峰。这些结果表明，大动能的空态密度可以通过自由电子抛物线很好地描述。在低于 30 eV 的能量范围内，与之前发表的 ARSEE 实验获得了良好的一致性。进行 XPS 和 AES 测量以验证 59 eV 峰值并非源自杂质水平。氩离子轰击后，HOPG 的 ARSEE 光谱中观察到的精细结构被完全去除。
The angle-resolved secondary-electron emission (ARSEE) spectra of highly oriented pyrolytic graphite have been measured in the 7-70 eV electron kinetic energy range. A peak observed at approximately= 59 eV with K/sub///= 1.35-1.65 AA-1 was tentatively explained within a semiempirical approach based on a free electron parabola with an inner potential of-16.2 eV (relative to the vacuum level) which crosses the M point at 59 eV. From the crossing of the free electron parabola with the zone centre peaks at 16 eV and 28.5 eV were independently described. These results suggest that the empty density of states for large kinetic energies are well described by a free electron parabola. In the energy range below 30 eV good agreement was obtained with previously published ARSEE experiments. XPS and AES measurements were performed to verify that the 59 eV peak did no originate from an impurity level. After argon ion bombardment the fine structure observed in the ARSEE spectra of HOPG was completely removed.