An improved LTE model of a high pressure sulfur discharge
Chas. W. Johnston, H.W.P. van der Heijden, A. Hartgers, K. Garloff, Jan van Dijk, Joost J. A. M. van der Mullen · Journal of Physics D Applied Physics · 2003
An existing LTE model (Johnston C W et al 2002 J. Phys. D: Appl. Phys . 35 342 ) of a high pressure sulfur discharge is improved upon by more accurate and complete treatment of each term in the energy balance. The simulation program PLASIMO (Janssen G M et al 1999 Plasma Sources Sci. Technol . 8 1 , van Dijk J 2001 Modelling of plasma light sources: an object-oriented approach PhD Thesis Eindhoven University of Technology, The Netherlands, ISBN 90-386-1819-0), which is an integrated environment for construction and execution of plasma models, has been used to define and solve all aspects of the model. The electric field is treated as being dc, and the temperature dependent nature of species interactions is incorporated in determination of transport coefficients. In addition to the main radiative transition, , several others in S 2 are included. These are , and . The S 3 molecule is also included in the composition as an absorbing particle. Furthermore, radiation production is treated quantum mechanically. The principle improvement over the previous work is that both the position of the spectral maximum and the pressure shift are quantitatively described by the current model. Both are chiefly due to the presence of S 3 .