TY - JOUR
T1 - Resonance-enhanced laser-induced plasma spectroscopy
T2 - Ambient gas effects
AU - Lui, S. L.
AU - Cheung, N. H.
N1 - Funding Information:
This work was supported by the Research Grants Council of the University Grants Committee of Hong Kong and Faculty Research Grants from Hong Kong Baptist University.
PY - 2003/9/26
Y1 - 2003/9/26
N2 - When performing laser-induced plasma spectroscopy for elemental analysis, the sensitivity could be significantly enhanced if the plume was resonantly rekindled by a dye laser pulse. The extent of the enhancement was found to depend on the ambient gas. Air, nitrogen, helium, argon and xenon at pressures ranging from vacuum to 1 bar were investigated. In vacuum, the analyte signal was boosted because of reduced cooling, but it soon decayed as the plume freely expanded. By choosing the right ambient gas at the right pressure, the expanding plume could be confined as well as thermally insulated to maximize the analyte signal. For instance, an ambient of 13 mbar xenon yielded a signal-to-noise ratio of 110. That ratio was 53 when the pellet was ablated in air, and decreased further to 5 if the dye laser was tuned off resonance.
AB - When performing laser-induced plasma spectroscopy for elemental analysis, the sensitivity could be significantly enhanced if the plume was resonantly rekindled by a dye laser pulse. The extent of the enhancement was found to depend on the ambient gas. Air, nitrogen, helium, argon and xenon at pressures ranging from vacuum to 1 bar were investigated. In vacuum, the analyte signal was boosted because of reduced cooling, but it soon decayed as the plume freely expanded. By choosing the right ambient gas at the right pressure, the expanding plume could be confined as well as thermally insulated to maximize the analyte signal. For instance, an ambient of 13 mbar xenon yielded a signal-to-noise ratio of 110. That ratio was 53 when the pellet was ablated in air, and decreased further to 5 if the dye laser was tuned off resonance.
KW - Ambient gas effects
KW - Double-pulse approach
KW - Laser-induced breakdown spectroscopy
KW - Resonance-enhanced laser-induced plasma spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=0141621136&partnerID=8YFLogxK
U2 - 10.1016/S0584-8547(03)00139-3
DO - 10.1016/S0584-8547(03)00139-3
M3 - Journal article
AN - SCOPUS:0141621136
SN - 0584-8547
VL - 58
SP - 1613
EP - 1623
JO - Spectrochimica Acta, Part B: Atomic Spectroscopy
JF - Spectrochimica Acta, Part B: Atomic Spectroscopy
IS - 9
ER -