Investigation of moving striations in the low pressure krypton-mercury vapor discharges

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When the fluorescent lamp, which is filled low pressure krypton gas and saturated mercury vapor, is operated on a commercial ballast working at 50 or 60 Hz, it has the characteristics as follows; as the electric power of the lamp is reduced at room temperature, it can sustain the same light emission characteristics as the general one. But when the ambient temperature around the lamp is lower than the room temperature, the fluctuation of light emission appears below the critical temperature and the light emission is reduced remarkably.To investigate these defective phenomena in the lamp, we studied the properties of the discharge voltage-current, the fluctuation frequencies and wavelength of moving lights which depend on the ambient temperature at the constant pressure of the filling gas. As the results, we obtained conclusions as follows.(1) The fluctuation of light emission behaves like as the positive moving striations.(2) The temperature at which moving striations appear is inferred to be determined by a mole fraction and a mole number in the discharge tube of krypton-mecury vapor mixture.(3) These moving striations have similar characteristics to "r" wave which is based on the fluctuation of ion density in Ne gas discharge.(4) In this temperature region in which moving striations appear, the excitation of krypton gas is activated, and the light emission of mercury line decreases.
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