Temperature effects in high fluence ion modification of HOPG

Abstract

The ion-induced processes of HOPG (UPV-1T) modification under high-fluence (10 18–10 19 ion/cm 2) 30 keV Ar + and Ne + ion irradiation have been studied from room temperature till 400 °C. The temperature dependences of ion–induced electron emission yield have been found, in contrary to isotropic graphite MPG-8, the essentially different for HOPG between heating and following cooling measurements. For Ar + irradiation only in the 150–300 °C temperature range anomalously large depth of ion-modified surface layer with developed morphology have been found. The results are discussed in frame of the Ehrlich–Schwoebel instability.