Emission and afterglow properties of an expanding RF plasma with nonuniform neutral gas density
In this, we describe some notable aspects of the light emission and afterglow properties in pulsed, high-density (1018–1020 m-3) argon inductively coupled discharges initiated following fast gas injection. The plasma was created in a long, narrow discharge tube and then expanded downstream of the radiofrequency (RF) antenna into a large chamber. Fast camera images of the expanding plasma revealed a multi-phase time-dependent emission pattern that did not follow the ion density distribution. Dramatic differences in visible brightness were observed between discharges with and without an externally applied magnetic field. These phenomena were studied by tracking excited state populations using passivemore »