Real-time Raman measurements have been performed on graphite under 3-keV Ar⁺-ion irradiation with a time resolution of 6 sec. Ion flux of 3×{}10¹¹ and 4×{}10¹⁰ ions/cm² sec are used. The graphite lattice damage is estimated by the relative intensity ratio of the disorder-induced peak ({~}1360 cm^-1) with respect to the Raman-active E2g-mode peak ({~}1580 cm^-1). The relative intensity change in the Raman spectrum caused by the irradiation is explained in terms of a reduction in the phonon correlation length due to defects.
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Nakamura et al. (1992) studied this question.
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