HIGHLY SENSITIVE DETECTION OF AROMATIC-MOLECULES BY LASER 2-PHOTON IONIZATION ON THE SURFACE OF WATER IN AMBIENT AIR

被引：34

作者：

INOUE, T ^{[1
]}

MASUDA, K ^{[1
]}

NAKASHIMA, K ^{[1
]}

OGAWA, T ^{[1
]}

机构：

[1] KYUSHU UNIV,DEPT MOLEC SCI & TECHNOL,KASUGA,FUKUOKA 816,JAPAN

来源：

ANALYTICAL CHEMISTRY | 1994年 / 66卷 / 07期

关键词：

D O I：

10.1021/ac00079a014

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The laser two-photon ionization technique has been applied to several aromatic molecules on the surface of water in ambient air. The observed signal consists of a fast component and a slow component. The fast component was assigned to photoelectrons, which were ejected from aromatic molecules via two-photon excitation-ionization processes. The slow component was assigned to oxygen anions, which were produced by an oxygen molecule capturing an ejected electron. The photoionization charge was linearly proportional to the solute concentration when the incident angle of the laser beam was large. Less soluble molecules displayed a larger signal. The detection limit of pyrene was 9 ng/dm3 (ppt), which was close to the detection limit obtained in hexane solution. This technique is found to be sensitive, convenient, and applicable in ambient air.

引用

页码：1012 / 1014

页数：3