Volume 95, Issue 10, 15 May 2004
Index of content:
- PLASMAS AND ELECTRICAL DISCHARGES (PACS 51-52)
95(2004); http://dx.doi.org/10.1063/1.1704867View Description Hide Description
A low-pressure mercury-free moly-oxide–argon electrodeless discharge is investigated with potential application to lighting. The inductive discharge is driven by a 13.56 MHz radio frequency(RF) generator at input powers between 100 and 200 W. Calibrated emission spectra in the near ultraviolet (UV), visible, and near infrared regions are recorded and the corresponding powers emitted as radiation are obtained. An extensive set of transition probabilities and rate coefficients for electron impact excitation between Mo states is assembled and a detailed collisional radiative model of the plasma is developed. The model includes 11 states of neutral Mo, the evaporative and recycling chemistry of into Mo and back, and the relevant species and reactions in argon–oxygen plasma. The possible paths for visible and UV radiation are analyzed in detail. The measured light output at 200 W RF input power is per watt (lpw) with a potential to reach Comparison of the model with data for various radiated powers and electron density shows reasonable agreement.