The RF discharge was housed in a 4-way
cruciform stainless-steel vessel pumped by a
turbo-molecular pump backed by a rotary pump
to a base pressure order of 103 Pa. A schematic
diagram of the plasma reactor is shown in Fig. 1.
The chamber was grounded and argon gas
discharge was sustained through 13.56MHz RF
excitation at 20WRF power for two different
constant pressures (1.6 and 16 Pa).