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Laser ablation of submonolayer coatings

Recent experimental and theoretical studies have been developed on photodesorption of the submonoatomic sodium coatings from the sapphire surface under the action of the first and the second harmonic radiation of a neodymium laser. It is shown that with increasing the excitation intensity the linear ((lambda) equals 532 nm) or quadratic ((lambda) equals 1064 nm) growth of photodesorption intensity is changed by the threshold exponential growth resulting in the saturation due to complete devastation of the surface. The earlier model of resonance photoatomic desorption has been extended into higher intensities. The speed of the `heating' of adsorbed atoms has been calculated in conditions of multiphoton resonance radiation absorption. The rate of the adsorbate-adsorbent energy exchange has been estimated, indicating close agreement with our earlier measurement of the accommodation coefficient of an atom impacting a surface.