The time dependence of the Raman spectra of graphite is measured under 3-keV Ar+-ion irradiation by developing a real-time Raman measurement apparatus. An ion flux of 3×1011 ions/cm2 s is used and the time resolution of the Raman measurement is about 6 s. The lattice damage of graphite is evaluated by the relative intensity of the disorder-induced peak (∼1360 cm−1) with respect to the Raman active E2g2 mode peak (∼1580 cm−1). An initial steep rise and a successive slow increase to saturation of the relative intensity ratio are observed.
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Nakamura et al. (1991) studied this question.
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