Ion energy of laser plasmas produced by repeated nanosecond pulsed laser ablation of graphite is measured by time-of-flight (TOF) spectrometry and retarding potential analysis. An Nd:YAG laser with λ = 1064 nm wavelength is incident toward the center of a cylindrical graphite target while the target is rotated along its axis. Ion energy distributions are measured via TOF spectroscopy. TOF signals show a decrease in the ion peak current by half followed by shifting of the signals by 4  μs toward later times after 10 000 laser shots. An ion energy decrease of 200 eV was measured from the retarding potential analysis.

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