Raman spectra of ZnO targets irradiated at with laser fluence (a) (b) .
Mapping picture of the crater produced in the ZnO target upon laser irradiation at . Near the centre of the crater laser fluence is . Raman spectra recorded scanning the crater from the outer part (upper part) toward its center (lowest part).
Zn and signal intensity (obtained by integrating the Zn and mass peaks of the time-of-flight mass spectrum of the postionized plume) vs the delay between the pulses of ablation and postionization. Full squares ◼ correspond to the Zn signal; open circles ○ correspond to . (a) The ablation wavelength is . (b) The ablation wavelength is .
Mass spectra of the ablation plume of ZnO targets. (a) Neutral species observed at the laser wavelengths of 266 and . (b) Positive ions observed at the laser wavelength of . (c) Positive ions at the wavelength of .
Frequencies and FWHM of nonirradiated ZnO targets and irradiated at ( and ).
Ablation of ZnO targets at 266 and . Average kinetic energies of Zn and in the plume, derived from the experimental time distributions at two different laser fluences.
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