金属学报(英文版),
2001, 14(6): 473-478.
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1.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China;Laboratori Nazionali di Frascati, Istituto Nazionali di Fisica Nucleare, Via Enrico Fermi 40. P.O. Box 13, I-00044 Frascati, I
2.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing ,100039, China
3.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
4.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
5.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
6.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
7.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
8.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China
9.Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing 100101, China
基金项目:
国家自然科学基金(10074063)
中国科学院资助项目(KJ952-S1-418)
INVESTIGATION OF BONDING IN NANO-SiO2 BY Si L2,3 X-RAY ABSORPTION NEAR-EDGE STRUCTURE SPECTROSCOPY
Keywords:
multiple scattering calculation
The Si L2,3 X-ray absorption near-edge structure (XANES) can be used to probe thelocal structure around Si and derive electronic information of the unoccupied s- andd-like partial density of states in nano-size SiO2. We present Si L2,3-edge for threedifferent size silicates acquired by total electron yield (TEY) at the photoemission sta-tion of Beijing Synchrotron Radiation Facility (BSRF). The Si L2,3-edge spectra areinterpreted based on ab initio full multiple-scattering (MS) calculation. The Si L2.3-edge of nano-size materials has XANES similar to that of a-quartz. The similaritiesbetween the Si L2.3-edge shapes attest to a common molecular-orbital picture of theirSi-O bonding and the same coordination state. However, a considerable broadeningof Si L2,3-edge XANES spectra as decrease of particle size is also an indicative ofpolyhedral distortions.