Chemical effects in the carbon K V V Auger line shapes

Abstract

A carbon Auger line shape study of nitroaromatic explosives J. Chem. Phys. 80, 4513 (1984); 10.1063/1.447236Auger line shape studies of carbon species on Rh and Ni surfaces J. Vac. Sci. Technol. A 1, 995 (1983); 10.1116/1.572021 C(K V V) Auger line shape of chemisorbed CO Summary Abstract: Evidence for screening effects in the carbon K V V Auger line shape of intercalated graphiteWe review the results of a consistent quantitative interpretation of the C KVV Auger line shapes of five different gas phase hydrocarbons (methane, ethane, cyclohexane, benzene, and ethylene), three solids (polyethylene, diamond, and graphite), and a molecularly chemisorbed system (ethylene/Ni). The normal kvv line shape accounts for only about one-half of the total experimental intensity for most of the Auger line shapes. The remaining part of the experimental line shape can be attributed to satellites resulting from resonant excitation or dynamic screening processes. The normal kut' Auger line shapes are seen to reflect delocalized holes; however, correlation effects are very evident. Although these screening and correlation effects complicate the interpretation of the line shapes, they provided a means to obtain unique chemical, electronic, and bonding information, and indeed cause the principal differences seen among the experimental line shapes.

Ascertaining the Carbon Hybridization States of Synthetic Polymers with X-ray Induced Auger Electron Spectroscopy

“…We were interested in extending the technique described above to facilitate the quantification of the hybridization states of a broad range of carbon-based materials and to ultimately realize a type of universal calibration method. , Since the density of states in the valence band and thus the shapes of corresponding C KLL Auger signals are affected by the physical properties and chemical structures displayed by the samples under study, ,, efforts were directed toward the analysis of a systematic series of polymers and related small molecules containing carbon atoms with varying degrees of hybridization states as well as nitrogen and oxygen heteroatoms.…”

Background Free Measurement of the Spectra of Low Energy Electrons Emitted as a Result of Auger Transitions in Metals

“…Electron and X-ray induced Auger electron spectroscopy (EAES and XAES) are extremely sensitive to the composition and chemistry of the surface [1][2][3] owing to the short inelastic mean free path of electrons (5 Å − 20 Å) emitted in the Auger energy range (∼ 20-2000 eV) 4,5 . Both these techniques use an incident beam energy greater than the ionization energy of the core electron (E C ) that is removed in order to initiate the Auger process.…”