Calibration Effects for Laser-Induced Breakdown Spectroscopy of Gaseous Sample Streams:  Analyte Response of Gas-Phase Species versus Solid-Phase Species

Abstract

The effects of analyte phase on the calibration response for laser-induced breakdown spectroscopy is investigated for a range of carbon species. Significant differences in the atomic emission signal from carbon were observed when comparing calibration streams of gas-phase and submicrometer-sized solid-phase carbon species. The resulting calibration curve slopes varied by a factor of 8 over a comparable range of atomic carbon concentrations for five different analyte sources, while the plasma electron density and temperature remained essentially constant. The current findings challenge a widely held assumption that complete dissociation of constituent species within a highly energetic laser-induced plasma results in independence of the analyte atomic emission signal on the analyte source. A physical model of the plasma-analyte interaction is proposed that provides a framework to account for the observed dependence on the physical state of the analyte.

Storms on Venus: Lightning-induced chemistry and predicted products

“…They used microplasmas to study the reaction CO 2 -COþO. Hohreiter and Hahn (2005) obtained these products and also saw elemental carbon, C, from dissociation of CO 2 . They used LIBS (laser-induced breakdown spectroscopy) to observe the carbon emission line at 247.86 nm.…”

New Approach for Near-Real-Time Measurement of Elemental Composition of Aerosol Using Laser-Induced Breakdown Spectroscopy

“…The raw signal intensity was subsequently converted to a peak-to-base ratio (P/B), defined as the integrated absolute atomic emission line intensity normalized to the plasma continuum intensity close to the atomic line spectral region (Hahn 1998;Hohreiter and Hahn 2005;Park et al 2009). Defined this way, the P/B ratio represents the S/N ratio for a particular element and accounts for any fluctuations arising from the shift in continuum emission intensity.…”

On-line monitoring of composite nanoparticles synthesized in a pre-industrial laser pyrolysis reactor using Laser-Induced Breakdown Spectroscopy

“…In addition, possible depletion of nanometric-sized particles from the plasma core was also reported [25]. Previous experiments carried out in our laboratory at INERIS showed linear dependence of LIBS intensity on particle sizes ranging from 40 nm to 500 nm while irradiating NaCl particles under comparable experimental conditions.…”