2-PHOTON IONIZATION DETECTION OF ADSORBED MOLECULES ON A METAL-SURFACE AT ATMOSPHERIC-PRESSURE BY 355-NM LASER IRRADIATION

Authors
KAWAZUMI H YASUDA TO OGAWA T
Citation
H. Kawazumi et al., 2-PHOTON IONIZATION DETECTION OF ADSORBED MOLECULES ON A METAL-SURFACE AT ATMOSPHERIC-PRESSURE BY 355-NM LASER IRRADIATION, Analytica chimica acta, 283(1), 1993, pp. 111-114
Citations number
18
Categorie Soggetti
Chemistry Analytical
Journal title
Analytica chimica acta → ACNP
ISSN journal
00032670
Volume
283
Issue
1
Year of publication
1993
Pages
111 - 114
Database
ISI
SICI code
0003-2670(1993)283:1<111:2IDOAM>2.0.ZU;2-2
Abstract
Two-photon ionization was applied to the sensitive detection of aromat ic molecules and dyes on a metal surface in ambient air by using the t hird harmonic of an Nd: YAG laser. The better quality of the Nd:YAG la ser beam compared with a nitrogen laser improved the sensitivity. The detection limits were of the order of 10(-3) monolayer coverage. The d ependence of the ionization signal on the molar absorptivity and the m etal substrate was measured.