论文信息 - Graphitization of Tetrahedral Amorphous Carbon Films Induced by Core Electron Excitations

Graphitization of Tetrahedral Amorphous Carbon Films Induced by Core Electron Excitations

We studied effects of soft X-ray illumination on tetrahedral amorphous carbon (ta-C) films by in situ measuring spectra of X-ray absorption and resonant Auger electron emission. Illumination with 285 ±3.5 eV photons, resonant mainly with the π* peak associated with graphitic structures and partly with the tentatively assigned σ* core exciton peak, induced a change in the surface-sensitive absorption and Auger spectra which is interpreted as an increase of graphitic phase, similar to but slightly different from the structural conversion from sp3 to sp2 bonding that is induced by 200 keV electron beam irradiation previously found by the authors.

[1] Lewis,et al. Lattice disordering in graphite under rare-gas ion irradiation studied by Raman spectroscopy. , 1994, Physical review. B, Condensed matter.

[2] Koji Maeda,et al. Electron-Irradiation-Induced Ordering In Tetrahedral-Amorphous Carbon Films , 2002 .

[3] Near Edge X-Ray Absorption Fine Structure Study for Optimization of Hard Diamond-Like Carbon Film Formation with Ar Cluster Ion Beam , 2003 .

[4] M. Knupfer,et al. Electronic properties of FeCl 3 -intercalated single-wall carbon nanotubes , 2004 .

[5] Carr,et al. Graphitic interlayer states: A carbon K near-edge x-ray-absorption fine-structure study. , 1991, Physical review. B, Condensed matter.

[6] Hughes,et al. Observation of a C-1s core exciton in diamond. , 1985, Physical review letters.

[7] Yasuhiro Yamamoto,et al. Creation of nanodiamonds by single impacts of highly charged ions upon graphite , 2001 .

[8] M. Siegal,et al. Electron emission induced modifications in amorphous tetrahedral diamondlike carbon , 1998 .

[9] Guo,et al. Core excitons and vibronic coupling in diamond and graphite. , 1993, Physical review letters.

[10] Robertson,et al. Properties of filtered-ion-beam-deposited diamondlike carbon as a function of ion energy. , 1993, Physical review. B, Condensed matter.