Three distinct characteristic plasma volumes were experimentally measured and are discussed in the context of the analysis of gaseous and aerosol systems using laser-induced breakdown spectroscopy. The resulting statistical sample volume, emission-based plasma volume, and the physical plasma volume, range between 1.2 × 10-3 and 2.4 × 10-3 cm3, and the variations are interpreted in terms of the intrinsic behavior of laser-induced plasma-particle interactions. Due to plasma non-homogeneity, the particle vaporization necessary for subsequent detection is limited to a plasma region somewhat smaller than the region defined by the physical plasma volume based on optical absorption. In contrast, the emission-based plasma volume, the largest of the three recorded volumes, reflects analyte emission following particle vaporization and diffusion, and is considered in terms of an equivalent emitting plasma volume.
ASJC Scopus subject areas
- Analytical Chemistry