TY - JOUR
T1 - Particle size limits for quantitative aerosol analysis using laser-induced breakdown spectroscopy
T2 - Temporal considerations
AU - Asgill, Michael E.
AU - Hahn, David W.
N1 - Funding Information:
This work was supported in part by the National Science Foundation through grant CHE-0822469 , as part of the Plasma–Analyte Interaction Working Group (PAIWG), a collaborative effort of the University of Florida, Federal Institute of Materials Research and Testing (BAM) in Berlin, and the Institute for Analytical Sciences (ISAS) in Dortmund, jointly funded by the NSF and DFG.
PY - 2009/10
Y1 - 2009/10
N2 - The temporal evolution of the Si atomic emission signal produced from individual silica microspheres in an aerosolized air stream was investigated using laser-induced breakdown spectroscopy (LIBS). Specifically, the temporal evolution of Si emission from 2.47 and 4.09-micrometer-sized particles is evaluated over discrete delay times ranging from 15 to 70 μs following plasma initiation. The analyte signal profile from the microspheres, taken as the silicon atomic emission peak-to-continuum ratio, was observed to follow the same profile of silicon-rich nanoparticles over the range of delay times. The ratio of analyte signals for the 2.47 and 4.09-micrometer particles was observed to be approximately constant with plasma decay time and less than the expected mass ratio, leading to the conclusion that further vaporization and enhanced analyte response do not continue with increasing delay times for these microsphere sizes. While recent research suggests that the temporal component of analyte response is important for quantitative LIBS analysis, the current study does confirm earlier research demonstrating an upper size limit for quantitative aerosol particle analysis in the diameter range of 2 to 2.5 μm for silica microspheres.
AB - The temporal evolution of the Si atomic emission signal produced from individual silica microspheres in an aerosolized air stream was investigated using laser-induced breakdown spectroscopy (LIBS). Specifically, the temporal evolution of Si emission from 2.47 and 4.09-micrometer-sized particles is evaluated over discrete delay times ranging from 15 to 70 μs following plasma initiation. The analyte signal profile from the microspheres, taken as the silicon atomic emission peak-to-continuum ratio, was observed to follow the same profile of silicon-rich nanoparticles over the range of delay times. The ratio of analyte signals for the 2.47 and 4.09-micrometer particles was observed to be approximately constant with plasma decay time and less than the expected mass ratio, leading to the conclusion that further vaporization and enhanced analyte response do not continue with increasing delay times for these microsphere sizes. While recent research suggests that the temporal component of analyte response is important for quantitative LIBS analysis, the current study does confirm earlier research demonstrating an upper size limit for quantitative aerosol particle analysis in the diameter range of 2 to 2.5 μm for silica microspheres.
KW - Aerosol analysis
KW - Laser-induced breakdown spectroscopy
KW - LIBS
KW - Plasma-analyte interactions
UR - http://www.scopus.com/inward/record.url?scp=72049108084&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=72049108084&partnerID=8YFLogxK
U2 - 10.1016/j.sab.2009.07.026
DO - 10.1016/j.sab.2009.07.026
M3 - Article
AN - SCOPUS:72049108084
SN - 0584-8547
VL - 64
SP - 1153
EP - 1158
JO - Spectrochimica Acta, Part B: Atomic Spectroscopy
JF - Spectrochimica Acta, Part B: Atomic Spectroscopy
IS - 10
ER -