Requisites for Ultimate Energy Resolution EELS and Band Gap Measurements
نویسندگان
چکیده
منابع مشابه
VEELS band gap measurements using monochromated electrons
With the development of monochromators for transmission electron microscopes, valence electron energy-loss spectroscopy (VEELS) has become a powerful technique to study the band structure of materials with high spatial resolution. However, artefacts such as Cerenkov radiation and surface effects pose a limit for interpretation of the low-loss spectra; also the inelastic delocalisation restricts...
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1 Nion Co., 1102 Eight St, Kirkland, WA 98033, USA 2 Center for Solid State Science, Arizona State University, Tempe, AZ 85287, USA 3 Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA 4 School for Engineering of Matter, Transport and Energy, ASU, Tempe, AZ 85287, USA 5 Department of Physics, ASU, Tempe, AZ 85287, USA 6 Department of Physics, University of ...
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An important property with any new material is the band gap. Standard density functional theory methods grossly underestimate band gaps. This is known as the band gap problem. Here, we show that the hybrid B3PW91 density functional returns band gaps with a mean absolute deviation (MAD) from experiment of 0.22 eV over 64 insulators with gaps spanning a factor of 500 from 0.014 to 7 eV. The MAD i...
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ژورنال
عنوان ژورنال: Microscopy and Microanalysis
سال: 2006
ISSN: 1431-9276,1435-8115
DOI: 10.1017/s1431927606068905