Analysis of theπ*andσ*bands of the x-ray absorption spectrum of amorphous carbon

摘要: The same method used to determine Σ* excitations in the x-ray-absorption spectra of organic molecules is applied analyze structure band x-ray absorption amorphous carbon (a-C) films. analysis assumes that only a Σ bond interaction first neighbors relevant explain a-C This justified by local character probe and short- range order existing these identification different components based on dependence binding energy with distance. built up summing resulting from possible types bonds a-C. serves separate π* states identify kind chemical between atoms. yields proportion sp³-bonded atoms 60% film density about 2.9 g/cm³, which value closer what expected theoretical calculations. identifies component at 288.5 eV associated strained type existingmore » sp{sup 3} bonded rings like cyclopropene. Raman photoemission spectroscopies help interpretation assignment components.« less