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Scanning electron microscopy (SEM) micrographs of highly oriented pyrolytic graphite after irradiation with 25 overlapping laser pulses at a wavelength of . Inset: SEM image of the wall of the central crater.
(Color online) Ablation depth per pulse as a function of incident fluence. The solid line corresponds to a two-temperature model. Inset: Measured area vs pulse energy for the central crater (squares) and the weakly ablated surrounding region (circles).
(Color online) UV Raman spectra of material within the central crater and far away from this region after femtosecond irradiation.
(Color online) X-ray photoelectron spectra of C lines measured within the irradiated crater and an unirradiated region. Inset: deconvolution of C line of irradiated crater with , , and binding energy at 283.5, 284.4, and , respectively.
(Color online) Surface enhanced Raman scattering spectra of a crater, in the weakly ablated region and for pristine HOPG surface recorded at .
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