Emission line profile studies of electronic modulated inductively-coupled excited rf-EDL plasmas
The evolution of emission line profiles emitted by an electronically modulated electrodeless discharge lamp plasma was studied with respect to the influence of modulation frequency, modulation amplitude and power input to the plasma. The 114Cd EDL was excited by a radio-frequency of 150 MHz through the inductively-coupled mode. The spectral lines of Cd studied have shown different degrees of self-absorption broadening in the beginning of the on-period of the modulation cycle. This broadening effect tended to disappear towards the end of the on-period. Line profiles were also found to be narrower in the case where the modulation factor is 100%. Increasing power led to increased half-widths without much increase in the profile height. © 1983.