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

    研究成果: Contribution to journalArticle査読

    35 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)1217-1220
    ページ数4
    ジャーナルAnalytical chemistry
    64
    11
    DOI
    出版ステータス出版済み - 1 1 1992

    All Science Journal Classification (ASJC) codes

    • 分析化学

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