Calibration effects for laser-induced breakdown spectroscopy of gaseous sample streams: Analyte response of gas-phase species versus solid-phase species

被引:67
作者
Hohreiter, V [1 ]
Hahn, DW [1 ]
机构
[1] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA
关键词
D O I
10.1021/ac048587d
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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.
引用
收藏
页码:1118 / 1124
页数:7
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