Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species

Abstract

Electron density and ionization temperatures were measured for inductively coupled argon plasma at atmospheric pressure. Different sample introduction systems were investigated. Samples containing Sn, Hg, Mg, and Fe and acidified with hydrochloric or acetic acids were introduced into plasma in the form of aerosol, gaseous mixture produced in the reaction of these solutions with NaBH 4 and the mixture of the aerosol and chemically generated gases. The electron densities measured from H α , H β , H γ , and H δ lines on the base of Stark broadening were compared. The study of the H Balmer series line profiles showed that the n e values from H γ and H δ were well consistent with those obtained from H β which was considered as a common standard line for spectroscopic measurement of electron density. The n e values varied from 0.5 6 · 10 15 to 1.3 2 · 10 15 cm −3 and were the highest at loading mixture of chemically generated gases. The ionization temperatures of plasma, determined on the base of the Saha approach from ion-to-atom line intensity ratios, were lower for Sn and Hg (6500–7200 K) than those from Fe and Mg lines (7000–7800 K). The Sn II/Sn I and Hg II/Hg I, Fe II/Fe I, and Mg II/Mg I intensity ratios and the electron densities ( n e ) were dependent on experimental conditions of plasma generation. Experimental and theoretically calculated ionization degrees were compared.