ABSTRACT
Also were measured the spectra emissions of Ba 553.5nm and Ba-' 455.4nm from the cathode region of fluorescent lamps in the 6Hz, 60Hz and 600Hz operations [24]. In the 600Hz operation against the others, the remarkably enhanced emissions of both spectra were observed mostly during the cathode cycle. Here, the thermal evaporation of emissive mixture from the cathode must be reduced by the decreased T. value. Accordingly, this indicates that a relatively serious sputtering of emissive mixture could be brought about by bombardments of the higher-energy ions accelerated by the higher electric field E, [29]. In conventional 60Hz steady-state operation, the thermal evaporation was considered as a major source of mixture exhausting during lamp life; so the mixture sputtering was not so marked in the electrode design of lamps.
