Trace Determination of Benzene and Aromatic Molecules in Hexane by Laser Two-Photon Ionization

Teiichiro Ogawa; Manabu Kise; To Oru Yasuda; Hirofumi Kawazumi; Sunao Yamada

doi:10.1021/ac00035a005

Trace Determination of Benzene and Aromatic Molecules in Hexane by Laser Two-Photon Ionization

Teiichiro Ogawa, Manabu Kise, To Oru Yasuda, Hirofumi Kawazumi, Sunao Yamada

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

LaMr two-photon ionization of several aromatic molecules In hexane has been carried out with the fourth harmonics (266 nm) of a Nd-YAG laser as an excitation source. The photolonlzatlon current Is quadratlcally proportional to the laser pulse energy, Indicating two-photon Ionization. There Is a large blank signal due to the solvent (hexane) Ionization, and it has been canceled with a differential technique. The effect of laser pulse energy fluctuation has been corrected by an on-line normalization procedure. The photolonlzatlon current also depends on the molar absorptivity of the molecule, and the first step to Ionization should be excitation at 266 nm above the ground state. The detection limit ranges from 3.8 ppb for benzene to 61 ppt for pyrene. Analytical curves were linear for at least 3 orders of magnitude above the detection limits.

Original language	English
Pages (from-to)	1217-1220
Number of pages	4
Journal	Analytical Chemistry
Volume	64
Issue number	11
DOIs	https://doi.org/10.1021/ac00035a005
Publication status	Published - Jun 1992

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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10.1021/ac00035a005

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title = "Trace Determination of Benzene and Aromatic Molecules in Hexane by Laser Two-Photon Ionization",

abstract = "LaMr two-photon ionization of several aromatic molecules In hexane has been carried out with the fourth harmonics (266 nm) of a Nd-YAG laser as an excitation source. The photolonlzatlon current Is quadratlcally proportional to the laser pulse energy, Indicating two-photon Ionization. There Is a large blank signal due to the solvent (hexane) Ionization, and it has been canceled with a differential technique. The effect of laser pulse energy fluctuation has been corrected by an on-line normalization procedure. The photolonlzatlon current also depends on the molar absorptivity of the molecule, and the first step to Ionization should be excitation at 266 nm above the ground state. The detection limit ranges from 3.8 ppb for benzene to 61 ppt for pyrene. Analytical curves were linear for at least 3 orders of magnitude above the detection limits.",

author = "Teiichiro Ogawa and Manabu Kise and Yasuda, {To Oru} and Hirofumi Kawazumi and Sunao Yamada",

year = "1992",

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publisher = "American Chemical Society (ACS)",

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T1 - Trace Determination of Benzene and Aromatic Molecules in Hexane by Laser Two-Photon Ionization

AU - Ogawa, Teiichiro

AU - Kise, Manabu

AU - Yasuda, To Oru

AU - Kawazumi, Hirofumi

AU - Yamada, Sunao

PY - 1992/6

Y1 - 1992/6

N2 - LaMr two-photon ionization of several aromatic molecules In hexane has been carried out with the fourth harmonics (266 nm) of a Nd-YAG laser as an excitation source. The photolonlzatlon current Is quadratlcally proportional to the laser pulse energy, Indicating two-photon Ionization. There Is a large blank signal due to the solvent (hexane) Ionization, and it has been canceled with a differential technique. The effect of laser pulse energy fluctuation has been corrected by an on-line normalization procedure. The photolonlzatlon current also depends on the molar absorptivity of the molecule, and the first step to Ionization should be excitation at 266 nm above the ground state. The detection limit ranges from 3.8 ppb for benzene to 61 ppt for pyrene. Analytical curves were linear for at least 3 orders of magnitude above the detection limits.

AB - LaMr two-photon ionization of several aromatic molecules In hexane has been carried out with the fourth harmonics (266 nm) of a Nd-YAG laser as an excitation source. The photolonlzatlon current Is quadratlcally proportional to the laser pulse energy, Indicating two-photon Ionization. There Is a large blank signal due to the solvent (hexane) Ionization, and it has been canceled with a differential technique. The effect of laser pulse energy fluctuation has been corrected by an on-line normalization procedure. The photolonlzatlon current also depends on the molar absorptivity of the molecule, and the first step to Ionization should be excitation at 266 nm above the ground state. The detection limit ranges from 3.8 ppb for benzene to 61 ppt for pyrene. Analytical curves were linear for at least 3 orders of magnitude above the detection limits.

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JO - Analytical Chemistry

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Trace Determination of Benzene and Aromatic Molecules in Hexane by Laser Two-Photon Ionization

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