Optical characterization of laser ablation particle production and plasma digestion processes in laser ablation ICP/MS
Conference
·
OSTI ID:273690
- Pacific Northwest Lab., Richland, WA (United States)
Sampling of solid materials using laser ablation coupled to ICP/MS or AES has many potential applications including analyses of insoluble solids, elemental analysis of highly radioactive materials, process monitoring, and remote probe design. These applications require representative material to be (1) removed from the sample, (2) transported to the plasma, and (3) digested by the plasma. All three aspects of laser ablation ICP/MS were investigated in the work presented here. The process of laser ablation removes small amounts of material from the sample in the form of aerosol particles. These can range in size from <0.1 to >10 micrometers depending on the sample and laser ablation parameters. Digestion characteristics of the plasma were examined for the various particle size distributions and correlated with the mass spectra obtained by ICP/MS. The sample materials used included glasses, DOE waste simulants, and metals. These were chosen for their range of composition and optical transmissions. An MPB Orion laser was used to provide ablation pulses. This laser can generate pulses of 7 ns, 0.5 ns, or 20 ps. The pulses at 7 and 0.5 ns are 1064, 532, 355, or 266 nm. Stimulated Raman processes are used to generate the shortest pulses so the wavelengths are shifted to slightly longer wavelengths. Appropriate selection of the gas in the Raman cell allows comparable wavelengths to be obtained at all pulse lengths.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 273690
- Report Number(s):
- CONF-960113--
- Country of Publication:
- United States
- Language:
- English
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