Structural change induced in carbon materials by electronic excitations

Koji Maeda; Shijin Liang; Yoshiaki Nakamura; Hiroaki Sato; Yutaka Mera

doi:10.1117/12.887568

18 May 2011 Structural change induced in carbon materials by electronic excitations

Koji Maeda, Shijin Liang, Yoshiaki Nakamura, Hiroaki Sato, Yutaka Mera

Proceedings Volume 8077, Damage to VUV, EUV, and X-ray Optics III; 80770J (2011) https://doi.org/10.1117/12.887568
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic

Abstract

Intense soft X-ray illumination near the carbon core edge induces significant structural damage in tetrahedral amorphous carbon films and less significant but detectable defect formation in single-walled carbon nanotubes (SWNTs). The efficiency spectra of the photo-induced damage commonly show a resonant peak between the π* and σ* peaks of X-ray absorption spectra in addition to a non-resonant background. The resonant damage cannot be explained by the coreexciton mechanism but can be attributed to a recoil damage accompanying the photo-desorption of heavy chemisorbates that is resonantly decomposed by the spectator Auger mechanism. The cause of the non-resonant damage in SWNTs may be attributed to anomalous radiation damage by low-energy electrons generated by secondary effects of soft X-ray illumination, which is supported by the recent finding by authors that hot electron injection from probe tips of scanning tunneling microscopes generates defects in the SWNT samples.

Citation Download Citation

Koji Maeda, Shijin Liang, Yoshiaki Nakamura, Hiroaki Sato, and Yutaka Mera "Structural change induced in carbon materials by electronic excitations", Proc. SPIE 8077, Damage to VUV, EUV, and X-ray Optics III, 80770J (18 May 2011); https://doi.org/10.1117/12.887568

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