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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 45,
  • Issue 3,
  • pp. 473-476
  • (1991)

Investigation of Transient Molecular Absorption in a Graphite Furnace by Laser-Induced Plasmas

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Abstract

The transient molecular species that are produced in electrothermal atomizers are probed by backlighting the furnace with continuum emission from laser-induced plasmas. Laser plasmas provide a stable and strong continuum spectrum in the UV region for molecular absorption studies. These plasma sources exhibit a substantial improvement in UV absorption measurement over the more conventional sources, permitting good time resolution. The molecular absorption spectrum from 190 to 320 nm for NaI, NaCl, and KH<sub>2</sub>PO<sub>4</sub> are illustrated. The temporal and spectral resolution of this instrument are 100 ms and 0.2 nm, respectively.

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