Eur. Phys. J. Appl. Phys.
Volume 76, Number 1, October 2016
|Number of page(s)||12|
|Section||Plasma, Discharges and Processes|
|Published online||10 October 2016|
Time-dependent coupled kinetics and gas temperature in N2-NO pulsed discharges
Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
2 Departamento de Engenharia Física, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
3 FOM Institute DIFFER, Eindhoven, The Netherlands
4 Eindhoven University of Technology, Department of Applied Physics, Eindhoven, The Netherlands
a e-mail: email@example.com
Revised: 14 June 2016
Accepted: 6 September 2016
Published online: 10 October 2016
A self-consistent time-dependent kinetic model coupled to the gas thermal balance equation is presented for a N2-1%NO millisecond pulsed DC discharge at a pressure of 266 Pa (2 Torr) and a current of 35 mA. The model provides the temporal evolution of the most important heavy species of interest to this work such as N2(X1Σg+, v), NO(X2Π), N2(A3Σu+), N2(a′1Σu-), N(4S) and O(3P), simultaneously with the time-dependent variation of the gas temperature. Predicted results for NO number densities during the pulse are compared to experimental ones measured by time-resolved quantum cascade laser absorption spectroscopy (QCLAS). The agreement between experiment and modelling predictions is very reasonable, mainly until a pulse duration of 2 ms, revealing the temporal evolution of the most important creation and loss mechanisms of NO(X). Simulations show a slow gas heating during the first millisecond. Thereafter, gas heating is accelerated and levels off at a time ~ 40 ms. These effects are explained and discussed in detail, together with the analysis of the fraction of the discharge power transferred to gas heating.
© EDP Sciences, 2016
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