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 journalArticle

35 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 languageEnglish
Pages (from-to)1217-1220
Number of pages4
JournalAnalytical chemistry
Volume64
Issue number11
DOIs
Publication statusPublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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