Computer simulations of a dielectric barrier discharge used for analytical spectrometry

Abstract

A model developed for a dielectric barrier discharge (DBD) in helium, used as a new spectroscopic source in analytical chemistry, is presented in this paper. The model is based on the fluid approach and describes the behavior of electrons, He+ and He+2 ions, He metastable atoms, He atoms in higher excited levels, and He2 dimers. The He ground-state atoms are regarded as background gas. The characteristic effect of charging/discharging of the dielectrics which cover both electrodes is also simulated. Typical results of the model include the distribution of potential inside the plasma (and the potential drop across the dielectrics), the electric current and gap voltage as a function of time for a given applied potential profile, the spatial and temporal number-density profiles of the different plasma species, and the relative contributions of the mechanisms of their production and loss.

Development of a parallel implicit solver of fluid modeling equations for gas discharges

“…In addition, molecular ions were the dominant ion species, rather than atomic ions. Similar trends were found in the previous study [9]. Fig.…”

Fluid Modeling of the Conversion of Methane into Higher Hydrocarbons in an Atmospheric Pressure Dielectric Barrier Discharge

“…Later the model was transformed and extended by Brok et al62 and incorporated into Plasimo. In this way the model has previously been used for investigating the breakdown phenomena in compact fluorescent lamps,62–64 the discharge characteristics of the plasma needle,65 the behavior of DBDs at low pressure,66 and the characteristics of DBDs used as ionization source in analytical spectrochemistry 67–69…”

Main Species and Physicochemical Processes in Cold Atmospheric‐pressure He + O2 Plasmas

“…21 species are incorporated in the model, and these are listed in Table 1. The list combines species considered in other studies of low‐pressure and atmospheric‐pressure plasmas with related chemistries: O 2 ,17–22 He,23, 24 air,25 Ar + O 2 ,17, 26 He + air,27 and He + O 2 18, 21. The importance of each species is then studied as a function of the oxygen concentration in the discharge.…”