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Intense atomic emission lines are observed when the surfaces of minerals, such as pyrite or zinc blende, are excited with UV laser pulses of 8 mJ energy, at a wavelength of 370 nm. The line spectra have been assigned to transitions of the metallic component of the material under investigation,
in the neutral charge state of the corresponding atom; a few ionic emissions have also been detected. A nonlinear dependence of the emission intensity on incident laser energy, as well as the observation of transitions at energies higher than the incident photon energy, indicates that multiphoton
processes are involved in the ablation and excitation process. The occurrence of the laser-induced emission phenomenon, at the pulse energies used, depends on characteristic properties of the material, such as absorption length, heat capacity, and enthalpy of vaporization. In the experiments,
minor components contained in the naturally occurring minerals have been detected with high sensitivity. On the basis of this observation, the potential of the method for trace analysis has been explored. Test solutions containing an ion to be analyzed, such as Pb2+, have been applied
to the surface of an ablatable copper or sulfur target. From the intensity of the recorded laser-induced Pb emission lines, a detection limit of less than 10 ppm or 35 mg/cm2 on the target has been deduced.
Physical Chemistry II, University of Bayreuth, D-W-8580 Bayreuth, Germany
Publication date: April 1, 1992
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)