Laser-enhanced ionization: recent developments

Boudreau, Denis; Gravel, Jean-François

doi:10.1016/s0167-2940(01)90081-0

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…Furthermore, the limited laser−material interaction area allows spatially resolved analysis of heterogeneous materials . Laser ablation has been used as a solid sampling method for various detection techniques, such as inductively coupled plasma mass spectrometry (ICPMS) and atomic emission spectrometry, as well as laser-excited atomic fluorescence spectrometry, diode laser atomic absorption spectrometry, and laser-enhanced ionization spectrometry (LEI) …”

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Use of Sol−Gels as Solid Matrixes for Trace Analysis by UV Laser Ablation and Laser-Enhanced Ionization Detection

et al. 2004

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Zirconium and silicon sol-gels were investigated as solid materials for trace elemental analysis of pelletized solid samples by laser ablation and laser-enhanced ionization. The highly homogeneous dispersion of an internal standard spiked in the solid material obtained with the sol-gel formation process leads to a significant improvement in signal repeatability and to an increase in the precision of measurements through better correction of variations in the laser ablation rate. Signal repeatability values of 5-8% RSD were obtained for Pb in NIST 1632c Bituminous Coal sample pellets prepared using both sol-gels, as compared to 9-21% for graphite-based sample pellets. Furthermore, the zirconium sol-gel was shown to offer better resilience to signal bias due to preferential ablation and a more accurate correction of ablation rate using the internal standardization method.

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Use of Sol−Gels as Solid Matrixes for Trace Analysis by UV Laser Ablation and Laser-Enhanced Ionization Detection

et al. 2004

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“…A detection technique that is well-suited for the analysis of the minute amount of material sampled by laser ablation is laser-enhanced ionization (LEI) . It is based on the selective laser excitation of analyte atoms to a high-lying state by tunable laser(s), followed by thermal ionization, usually in an air/acetylene flame in which the sample has been introduced, and detection of the resulting charges.…”

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“…5 A detection technique that is well-suited for the analysis of the minute amount of material sampled by laser ablation is laserenhanced ionization (LEI). 6 It is based on the selective laser excitation of analyte atoms to a high-lying state by tunable laser-(s), followed by thermal ionization, usually in an air/acetylene flame in which the sample has been introduced, and detection of the resulting charges. When excitation proceeds through favorable atomic transition(s) that lead to excited states lying sufficiently close to the ionization threshold, ionization and charge collection efficiencies are believed to be almost unity, 7 and the smallest measurable analytical signal is then determined by the fluctuations in the current carried by the native charges in the flame.…”

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Trace Level Determination of Lead in Solid Samples by UV Laser Ablation and Laser-Enhanced Ionization Detection

2003

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Laser-enhanced ionization was investigated as a detection technique for trace elemental analysis of solid samples by laser ablation. Laser ablation of aluminum samples was performed in an ablation cell, and the ablated material was carried by a flow of gas to a miniature LEI flame where Pb was detected. This decoupling of ablation cell and detector allowed the independent optimization of vaporization and detection processes. We have investigated the different excitation schemes for Pb and uncovered five new LEI-active transitions in the visible range. We have demonstrated that the use of an argon-oxygen/acetylene flame sheathed with argon resulted in the elimination of background interference from the two-photon ionization of nitric oxide. We have shown that the use of helium as a carrier gas results in a higher ablation yield and lower pulse-to-pulse variations in LEI signal and in better analytical figures of merit. We have characterized the performance of the technique in terms of detection limits and dynamic range, and we have obtained a detection limit of 60 ng/g for the determination of Pb in high purity aluminum.

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“…The advantages, limitation and developments of LEI have been reviewed by Boudreau and Gravel. 346 The problems created by matrix effects can be reduced if some form of separation of analyte from matrix is incorporated into the procedure. An example of this approach is the use of LEI as an element specific detector in gas chromatography.…”

Section: Laser Enhanced Ionizationmentioning

confidence: 99%

Advances in atomic emission, absorption and fluorescence spectrometry and related techniques

Evans

Dawson²,

Fisher

et al. 2002

J. Anal. At. Spectrom.

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Laser-enhanced ionization: recent developments

Cited by 13 publications

References 16 publications

Use of Sol−Gels as Solid Matrixes for Trace Analysis by UV Laser Ablation and Laser-Enhanced Ionization Detection

Use of Sol−Gels as Solid Matrixes for Trace Analysis by UV Laser Ablation and Laser-Enhanced Ionization Detection

Trace Level Determination of Lead in Solid Samples by UV Laser Ablation and Laser-Enhanced Ionization Detection

Advances in atomic emission, absorption and fluorescence spectrometry and related techniques

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