Soft X-ray emission and absorption spectra in the O K region of oxygen incorporated in microporous carbon

Soft X-ray emission and absorption spectra in the O K region of oxygen inco rporated in microporous carbon were measured using synchrotron radiation, i n order to directly observe the oxygen and identify its chemical bonding st ates on the graphitic surface in microporous carbon. The O K X-ray emission spectrum exhibits a peak at 526 eV with a low-energy tail, and the absorpt ion spectrum at the O K threshold exhibits a sharp peak at 531.5 eV and the n rises from 535 eV. Spectral feature analysis using DV-Xa molecular orbita l calculations show that the measured X-ray spectra are not sufficiently ex plained by H2O or typical substituents, such as -OH, -CHO, and -COOH, on th e graphitic surfaces. (C) 2001 Elsevier Science Ltd. All rights reserved.