Jahn-Teller Effect in Diamond-like Carbon Film

Details Jahn-Teller Effect in Diamond-like Carbon Film Jahn-Teller Effect in Diamond-like Carbon Film

1998-12-03

arxiv.org/abs/cond-mat/9812051v1

Physics

Condensed Matter

Materials Science

9 pages, 8 figures, RevTex

Scientific paper

The Jahn-Teller effect used semi-theoretically to analyse UV-visible spectra of the diamond like-carbon films on Si substrates. By deconvolution of UV-visible absorption spectra of the typical films, different absorption lines found. For each sample, six lines which were related to $\V^\circ$ by Jahn-Teller effect are distinguished. Our theoretical approach based on distortion of the $\V^\circ$ as the consequence of the stress in the films, is in agreement with experimental results. The shift of the Jahn-Teller lines toward the zero phonon line of $\V^\circ$ were found in accordance to stress decrease in the films. The difference between room temperature and low temperature spectra is discussed. We found that the splitting of the excited state of $\V^\circ$ in the films under stress is twice as large as that of the ground state.

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