Excitonic and quasiparticle lifetime effects on silicon electron energy loss spectra from first principles

2005 ◽  
Vol 71 (3) ◽  
Author(s):  
B. Arnaud ◽  
S. Lebègue ◽  
M. Alouani
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
First Principles ◽  
Quasiparticle Lifetime ◽  
Lifetime Effects ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra

scholarly journals First-Principles Modeling of Vibrational Electron Energy Loss Spectra

2019 ◽  
Vol 25 (S2) ◽  
pp. 602-603
Author(s):  
G Radtke ◽  
D Taverna ◽  
M Lazzeri ◽  
E Balan ◽  
FS Hage ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
First Principles ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra

Parallel Detection of Electron Energy Loss Spectra in Direct Mode

1990 ◽  
Vol 48 (2) ◽  
pp. 82-83
Author(s):  
Eckhard Quandt ◽  
Stephan laBarré ◽  
Andreas Hartmann ◽  
Heinz Niedrig
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Energy Resolution ◽  
Large Angle ◽  
Maximum Energy ◽  
Semiconductor Detectors ◽  
Parallel Detection ◽  
Photodiode Arrays ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra

Due to the development of semiconductor detectors with high spatial resolution -- e.g. charge coupled devices (CCDs) or photodiode arrays (PDAs) -- the parallel detection of electron energy loss spectra (EELS) has become an important alternative to serial registration. Using parallel detection for recording of energy spectroscopic large angle convergent beam patterns (LACBPs) special selected scattering vectors and small detection apertures lead to very low intensities. Therefore the very sensitive direct irradiation of a cooled linear PDA instead of the common combination of scintillator, fibre optic, and semiconductor has been investigated. In order to obtain a sufficient energy resolution the spectra are optionally magnified by a quadrupole-lens system.The detector used is a Hamamatsu S2304-512Q linear PDA with 512 diodes and removed quartz-glas window. The sensor size is 13 μm ∗ 2.5 mm with an element spacing of 25 μm. Along with the dispersion of 3.5 μm/eV at 40 keV the maximum energy resolution is limited to about 7 eV, so that a magnification system should be attached for experiments requiring a better resolution.

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