Abstract
Electric field distribution is measured in a plane-parallel hollow cathode discharge by using the Stark effect and the quadrupole moment transition with the aid of the laser-induced fluorescence technique. The He 2 1 S atoms are excited through the forbidden or allowed transitions produced by laser wavelength scanning. The intensity ratio of two fluorescences is proportional to the forbidden absorption coefficient due to the Stark effect. Moreover, in order to observe the absolute field strength without the intensity calibration, the fluorescence intensity ratio due to the Stark effect is compared with that due to the quadrupole moment transition. The observed potential differences over the dark space are in good agreement with results of probe measurements.
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