Spectra for Gaseous Halogens with the dc Arc and Inert Gas Shields

Abstract

The spectra for the halogens were excited in a Stallwood jet using a dc arc between 1% thoriated tungsten electrodes. The shield gases were helium, 50% argon-50% helium, and argon. In helium, only atomic lines of fluorine were excited, some singly ionized lines of chlorine were excited, and the atomic lines of iodine were weak. Atomic lines of fluorine were faintly visible in argon while the atomic lines of chlorine, bromine, and iodine showed an increasing intensity in 50% argon-50% helium, and argon, respectively.

New, computer-controlled microwave discharge emission spectrometer employing microarc sample atomization for trace and micro elemental analysis

“…Recently, much work has been done to develop stable, low background electrical discharges to replace the chemical flame as an atomic emission source. Plasma jets (1)(2)(3)(4)(5)(6), inductively coupled plasmas (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), and microwave discharges , all have been investigated for this application with varying degrees of success. Among these, the lowpower microwave plasma appears to offer intriguing possi-The microwave plasma is an electrical discharge maintained by the coupling of an oscillating electric field to electrons and ions contained in a closed volume, usually a quartz tube.…”