HREELS energy resolution

HREELS High-resolution electron energy-loss spectroscopy [129, 130] Same as EELS Identification of adsorbed species through their vibrational energy spectrum... 

Sc yrodcT. Ninth Conference on Electron Microscopy. 1978, vol. l,p.534. (Microscopial Society of Canada, Toronto, Canada) Unique combination of Eg = 30 keV used in HREELS study of -Si (H) films with meV energy resolution. 

HREELS High-Resolution Electron Energy Loss Spectroscopy... 

HREELS high-resolution electron energy loss spectroscopy... 

HREELS experiments [66] were performed in a UHV chamber. The chamber was pre-evacuated by polyphenylether-oil diffusion pump the base pressure reached 2 x 10 Torr. The HREELS spectrometer consisted of a double-pass electrostatic cylindrical-deflector-type monochromator and the same type of analyzer. The energy resolution of the spectrometer is 4-6 meV (32-48 cm ). A sample was transferred from the ICP growth chamber to the HREELS chamber in the atmosphere. It was clipped by a small tantalum plate, which was suspended by tantalum wires. The sample was radia-tively heated in vacuum by a tungsten filament placed at the rear. The sample temperature was measured by an infrared (A = 2.0 yum) optical pyrometer. All HREELS measurements were taken at room temperature. The electron incident and detection angles were each 72° to the surface normal. The primary electron energy was 15 eV. 

The other technique is HREELS (high resolution EELS) which utilises the inelastic scattering of low energy electrons in order to measure vibrational spectra of surface species. The use of low energy electrons ensures that it is a surface specific technique, and is often chosen for the study of most adsorbates on single crystal substrates. 

Xeels = electron energy loss spectroscopy. y hreels = high resolution electron energy loss spectroscopy. Z ceels = core level electron energy loss spectroscopy. aaesdiad = electron-stimulated ion angular distribution. 

Most studies on deposition of fullerenes on semiconductor surfaces have focused on silicon9 28 and, to a much less extent, on GaAs. Earlier experimental work using HREELS (high-resolution electron energy loss spectroscopy) on C60 adsorption on Si (100)2 x 1 surface suggested that the molecular attachment to the... 

HREEL High resolution electron energy loss... 

A somewhat similar case of an ensemble effect was proposed for CO adsorption on a Pt25Ni75(lll) alloy surface [63]. Whereas CO adsorbs on-top of Pt atoms [64], on Ni(lll) it adsorbs in the threefold hollow sites [65]. The HREELS (high-resolution electron energy loss spectroscopy) peak associated with CO adsorbed on threefold Ni sites almost vanishes if the sample prepara-... 

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