کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5396668 | 1505762 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electron relaxation and transport in nanostructured and bulk silica
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Processes of ballistic and hot electron relaxation in extended bulk as well as nanostructured silica have been analyzed by means of a phonon-based scattering model and respective Monte-Carlo computer simulation. Optical as well as acoustic phonons are taken into account. Trajectories of electrons and their energy attenuation in nanostructured silica are additionally affected by scattering processes at the grain boundaries between the nanoparticles, i.e. by surface phonon as well as potential scattering. Moreover, a flatter conduction band and a higher effective electron mass have been taken into account too. According to these calculations, electrons with an initial energy of several eV, but still below the valence band ionization threshold, were thermalized in 50-300Â fs increasing with the silica grain size from 1Â nm up to bulk material. The electron emission probabilities over the surface barrier into vacuum are extended up to depths of 60-100Â nm, respectively, increasing with enhancement by an electric field.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 173, Issues 2â3, July 2009, Pages 79-83
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 173, Issues 2â3, July 2009, Pages 79-83
نویسندگان
V.S. Kortov, S.V. Zvonarev, E. Schreiber, H.-J. Fitting,