Two-Photon Ionization Detection of Anthracene Derivatives and Dyes with Tunable Dye Laser Excitation

Abstract

Tunable dye lasers have been successfully applied to the two-photon ionization spectrometry of seven anthracene derivatives and five dyes in hexane. The sensitivity depended on the excitation wavelength as well as the molar absorptivity. Detection limits for anthracene, 2-methylanthracene and 1, 6-diphenylhexatriene were as low as 20pg/ml (1×10-10M). The detectability by the dye laser excitation was compared with that by the nitrogen laser excitation.