Microwave moderate-pressure discharge

Experiments with Non-Equilibrium Microwave Discharges of Moderate Pressure, Discharges in Waveguide Perpendicular to Gas Flow Direction, and Microwave Plasma Parameters in CO2... 

Non-Equilibrium Plasma-Chemical Microwave Discharges of Moderate Pressure... 

Figure 4-90. Three major regimes of nonequilibrium microwave discharges of moderate pressure.

Experimental Diagnostics of Plasma-Chemical Non-Equilibrium Microwave Discharges in Moderate-Pressure CO2 Plasma Measurements... 

The highest energy efficiency of CO2 dissociation in plasma can be achieved through its stimulation by vibrational excitation. This mechanism permits, in particular, 80% energy efficiency to be reached in non-thermal microwave discharges of moderate pressure (see Section 5.5.2). The main cause of energy losses in these systems is VT relaxation from low vibrational levels of CO2 molecules, which decreases exponentially with reduction of translational gas temperature. A significant decrease of translational gas temperatures (to... 

The energy efficiency of this plasma-chemical process can be high, because it ean be effectively stimulated in non-equilibrium discharges by vibrational excitation of CO2 molecules. A relatively high process efficiency was achieved in experiments with non-thermal microwave discharge at moderate pressures (Garsky, Givotov, Ivanov, 1981). 

High-Efficiency CH4 Conversion into C2H2 in Non-Thermal Moderate-Pressure Microwave Discharges... 

---