Effect of high-fluence ion irradiation on Raman scattering in glassy carbon

The results of an experimental study of the structural and morphological changes in the surface layer of SU-2500 glassy carbon due to high-dose 30 keV Ar+ ion irradiation in the temperature range of 60–400°C are presented and discussed. The given study is performed via the Raman scattering (RS) of laser radiation with the wavelengths 514 and 244 nm. Data analysis makes it possible to identify the nanocrystalline state of the surface layer at irradiation temperatures of 140–250°C and its amorphisized and polycrystalline states at room and elevated temperatures, respectively. The D peak of RS spectra is not observed at λL = 244 nm. It is demonstrated that ion bombardment leads to appreciable suppression of the G peak and can be used to reveal ion-induced states in carbon materials.