Structural change in amorphous carbon on core excitations induced by soft x-ray illumination

Koji Maeda; Shijin Liang; Yoshihisa Harada; Yoshinori Kitajima; Shik Shin; Yutaka Mera

doi:10.1117/12.723791

23 May 2007 Structural change in amorphous carbon on core excitations induced by soft x-ray illumination

Koji Maeda, Shijin Liang, Yoshihisa Harada, Yoshinori Kitajima, Shik Shin, Yutaka Mera

Author Affiliations +

Proceedings Volume 6586, Damage to VUV, EUV, and X-ray Optics; 65860C (2007) https://doi.org/10.1117/12.723791
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

Abstract

Effects of carbon 1s core excitations on the structure of tetrahedral amorphous carbon films were investigated by illuminating samples with intense soft X-rays from a synchrotron radiation source in the photon energy range of 240 eV to 310 eV. The structural changes detected in the X-ray absorption spectra obtained before and after the intense illumination are characterized by graphitic ordering, similar to the effect of high-energy electron irradiation. The excitation spectrum for the photo-stimulated structural changes was found to consist of a non-resonant component and a resonant component peaking at 289 eV close to the 288 eV XAS peak characteristic of ta-C films. The microscopic mechanisms are discussed for the non-resonant and the resonant effects.

Citation Download Citation

Koji Maeda, Shijin Liang, Yoshihisa Harada, Yoshinori Kitajima, Shik Shin, and Yutaka Mera "Structural change in amorphous carbon on core excitations induced by soft x-ray illumination", Proc. SPIE 6586, Damage to VUV, EUV, and X-ray Optics, 65860C (23 May 2007); https://doi.org/10.1117/12.723791

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