High-power pulse-modulated helium ICP for analytical excitation/ionization source

摘要

An atmospheric helium inductively coupled plasma (He-ICP) has been studied as a new plasma source for elemental analysis because it has sufficient ionization ability even for halogens. In this study, to apply a more higher-power pulse (over 2 kW), a new externally air-cooled ICP torch was designed and manufactured. The design of this torch is based on our vortex flow enhanced He-ICP torch. It has a discharge tube of 14 mm i d and 1 mm thickness, which is surrounded with an air cooling jacket of 18 mm i d and 1 mm thickness. The plasma properties of the high-power pulse-modulated He-ICP were measured using a spectroscopic method. The emission intensity of He atomic lines (447 148 nm) were measured.