Recent Progress in Laser Multi-Photon Ionization Spectrometry

Ogawa, Teiichiro

doi:10.2116/analsci.7.supple_1475

Anal. Sci.

1991

DOI: 10.2116/analsci.7.supple_1475

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Recent Progress in Laser Multi-Photon Ionization Spectrometry

Teiichiro Ogawa

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Cited by 4 publications

(2 citation statements)

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“…Laser multiphoton ionization (MPI) has been recognized as a very sensitive method of analysis, with high selectivity in its resonant mode. − In this method a laser pulse is applied to ionize a substrate in a process that involves several photons. The MPI technique has been coupled to many ion detection systems: The most powerful tool is obtained with a full MS detection system; , however, this setup is rather complicated and expensive.…”

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confidence: 99%

Laser Two-Photon Ionization of Pyrene on Contaminated Soils

et al. 1996

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We report a first attempt to use the laser multiphoton ionization method for analysis of trace aromatic compounds on the surface of environmental (soils) and artificial (silica) samples. The measurement setup is composed of a N(2) pulsed laser and a fast conductivity detection system. The technique has been tested for detection of pyrene deposited on moist fine-powdered samples. The observed photoionization signals have indicated a gradual increase in the photoionization current and charge as a function of increasing concentration of pyrene/hexane solutions used for sample contamination. Contaminants have been analyzed in several (organic and inorganic) environmental samples, and a method to compensate for matrix effects is suggested. A contamination model is assumed and applied in order to renormalize all signals and provide an useful calibration plot. This calibration plot provides an upper estimate of pyrene LOD as 35 ng/g.

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Laser Two-Photon Ionization of Pyrene on Contaminated Soils

et al. 1996

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“…Analytical methods based on laser MPI are known as very sensitive and selective when the resonant mode is applied. − In this approach, a short laser pulse is focused onto the examined substrate. Several photons are absorbed simultaneously to ionize the molecules.…”

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confidence: 99%

Particulate Material Analysis by a Laser Ionization Fast Conductivity Method. Water Content Effects

et al. 1997

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Combined laser multiphoton ionization and fast-conductivity methods have been applied to probe organic contamination on wet particulate samples. This is a first attempt of testing such a technique for this purpose. A special emphasis has been made on establishing correlation between sample water content and detection of pyrene, which has been used as a probe contaminant in this study. Environmental (soil) and artificial samples (silica gel) have been studied. The experimental setup includes a pulsed N(2) laser and a fast-conductivity detection system, operated in an opened chamber under ambient conditions. The correlation between the observed photoionization signals and water content has been investigated in a slow-drying mode, where water has been gradually evaporated. Surface contamination of wet samples has been more efficient than moist ones. This was evident, in the case of soil samples, from the earlier appearance (at lower pyrene concentrations) of saturation-type features of the detected photoionization signals. Assumptions of a contamination model has enabled certain compensation for sample and matrix effects.

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New sensor for ecological determination of benzene in ambient air

Schechter¹,

Schroeder²,

Kompa³

1993

Anal. Chem.

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Recent Progress in Laser Multi-Photon Ionization Spectrometry

Cited by 4 publications

References 4 publications

Laser Two-Photon Ionization of Pyrene on Contaminated Soils

Laser Two-Photon Ionization of Pyrene on Contaminated Soils

Particulate Material Analysis by a Laser Ionization Fast Conductivity Method. Water Content Effects

New sensor for ecological determination of benzene in ambient air

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