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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 49,
  • Issue 12,
  • pp. 1721-1728
  • (1995)

UV-Laser Plasma Study of Elemental Distributions of Paper Coatings

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Abstract

The potential of a laser-generated plasma method in the analysis of coating coverage, coatweight distribution, and 3D distribution of various pigments of paper coating is described. A XeCl-excimer laser (308 nm) was used to generate microscopic plasma from the paper coating, and delayed detection of silicon and calcium atomic emission line intensities was used as a measure of mass vaporized. Macroscopic areas typically 10 × 10 mm<sup>2</sup> at a spatial resolution of 250 μm were studied. With a single laser pulse (0.2 mJ of energy), about 2 ng of coating from a volume of 30 μm in diameter and 2 μm in depth was vaporized. The method seems to be useful for characterization of multilayer coatings.

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