Abstract

AbstractHigh‐resolution AES (HR‐AES) has been used to study the electronic state of Ar+‐irradiated graphite in which the increase in the partial charge density caused by the lattice damage has been indicated. At doses of <5 × 1011 Ar+ cm−2, which was reported as a maximum value to avoid the overlapping cascades, neither plasmon energies nor the work function in highly oriented pyrolytic graphite (HOPG) was changed. Increase in the work function was observed in Ar+‐irradiated graphite with doses in the range of ∼1 × 1013 to 1 × 1015 ions cm−2, and Ar+ at a dosage of 3 × 1014 ions cm2 increased the work function of HOPG by ∼0.2 eV. This implies an increase in the average electron density at the surface or an increase in the local electron density at a torn graphite edge. The π plasmon energy was decreased by an irradiation of >1 × 1014 Ar+ cm−2 and the π + σ plasmon energy was decreased slightly at >1 × 1015 Ar+ cm−2. The difference in the two energy variations in the range of 1 × 1014 to 1 × 1015 Ar+ cm−2 shows that the possibility of changes in the resonance energy and/or the lattice parameters is present if the π/σ electron ratio does not change. Copyright © 2003 John Wiley & Sons, Ltd.

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