The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.

Ion Bombardment Magnetron Furnace for Atomic Spectroscopy

Volume 43, Number 6 (Aug. 1989) Page 918-924

Tanguay, Suzanne; Sacks, Richard

Positive-ion bombardment of a graphite cathode in a low-pressure glow discharge is used to heat the cathode to temperatures in excess of 2000°C. A magnetic field of a few hundred Gauss used in a magnetron configuration reduces lamp voltage and permits operation at less than 1 kV with cathode current densities greater than 350 mA/cm2. A solution residue sample deposited on the 1.6-mm-diameter graphite cathode is atomized in about one second. The atomic vapor is excited in the glow discharge near the cathode surface. The effects of pressure and magnetic field strength on furnace performance are described. At low furnace temperature, plasma current conduction is by electrons produced by positive ion bombardment of the cathode surface. At higher temperatures, current conduction is largely by thermionic electrons.