High-Frequency Torch Discharge as Excitation Source for Spectrochemical Analysis

Abstract

High-frequency unipolar discharges in gases at atmospheric pressure, which are called as torch discharges, are summarized. Various types of the discharge generator, which are operated at frequencies between several tens and thousands MHz, and techniques to obtain the stable discharge are described. Relations between electron and gas temperatures, and energy distributions of electrons are discussed. Applications of the torch discharge as the excitation source for spectrochemical analysis are described.