Visible emission spectrum of pulse-periodic discharge in high-pressure cesium vapor

The spectrum of pulse-periodic discharge in high-pressure cesium vapor has been studied by experimental and theoretical methods. Experiments confirmed a significant shift of the 6P and 5D recombination continuum thresholds toward longer wavelengths, which was theoretically predicted previously for the emission from discharge in a dense cesium plasma. The overlapping continua form an almost continuous spectrum of emission in the visible spectral range. The results of calculations well agree with the experimental data. It is established that the discharge under consideration is an effective, mercury-free source of light with a color rendering index of Ra = 98 and a light yield of η = 81 lm/W.