Showing papers by "Baldur Eliasson published in 1990"

Investigation of resonance and excimer radiation from a dielectric barrier discharge in mixtures of mercury and the rare gases

Abstract: The excitation of resonance and excimer radiation in mixtures of mercury and the rare gases has been investigated. The gas mixtures were excited in a dielectric barrier discharge. The emission features of such discharges which are mostly in the UV and VUV range were studied in detail. Whereas resonance radiation dominates in mixtures of mercury with He, Ne, and Ar, efficient excimer formation takes place in mixtures of mercury with Kr and Xe. All the emission features of the HgXe excimer which are expected between and around the resonance lines of mercury were found and measured. A theoretical model of HgXe excimer formation is presented. This model takes both the discharge formation and the charged particle kinetics as well as the excimer and excited species formation into account. Experimentally determined Boltzmann temperatures show a decline with mercury density as is predicted by the theory for the average electron temperature. Furthermore it is, e.g., possible to calculate the efficiency of the gene...

Irradiating non-electrolytes from gas - filled discharge chamber by applying high potential electric source to electrodes using cylindrical electrode connected by dielectric layer

Abstract: An inner cylindrical electrode (1) is concentrically engaged by a dielective layer (2) spaced by a gas-filled discharge chamber (S) from a dielective cylinder (3) beyond which is an annular chamber (6) holding material to be irradiated and whose outer periphery is enclosed by a second cylindrical electrode. (4). High potential electric source (7) is connected to the electrode, covering emission of OV or VUV radiation under the effect of standing discharge. Discharged power is transmitted capacialicly through to mateial with little or no conductivity. in the outer chamber.

The Silent Discharge and Its Application to Ozone and Excimer Formation

Abstract: In this chapter a short review will be presented of the silent discharge and its applications. The silent discharge, or dielectric barrier discharge as it is sometimes called, has been known since the 1850’s when von Siemens used it for generating ozone. Because of this it is sometimes referred to in the literature as the “ozonizer discharge”. It is a non-equilibrium, high pressure discharge. It is one of the most important discharge types used in industrial plasma chemistry. In spite of the widespread applications of such discharges there were until recently few investigations of the structure of such discharges being done. During the last 10 years considerable progress has been achieved in understanding both the physics of the discharge process itself as well as the ensuing chemistry 1–3 .