Rubidium isotope measurements in solid samples by laser ablation-laser atomic absorption spectroscopy

L. A. King, I. B. Gornushkin, D. Pappas, B. W. Smith, J. D. Winefordner

Research output: Contribution to journalArticle

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Abstract

Laser atomic absorption was used to measure the rubidium isotopes in a laser-induced plasma. An 85Rb/87Rb isotope ratio of 2.7 ± 0.2 was determined in solid calcium carbonate samples. A Nd:YAG laser was used to produce the plasma on the surface of solid samples placed inside a low pressure chamber with a controlled atmosphere of 150 mtorr to 10 torr. The plasma conditions were optimized in order to provide the best sensitivity and resolution. A narrowband Ti:Sapphire laser was scanned across the 780.02-nm transition of the rubidium isotopes. The resolved isotope spectrum is shown, as well as the isotope selective calibration plots. A detection limit of 25 ppm for the individual isotopes was obtained. The optimization studies and the likely mechanisms of line broadening are discussed.

Original languageEnglish
Pages (from-to)1771-1781
Number of pages11
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume54
Issue number13
DOIs
StatePublished - Dec 13 1999

Keywords

  • Isotope ratio
  • Laser ablation
  • Laser atomic absorption spectroscopy
  • Laser-induced plasma spectroscopy
  • Rubidium

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