Abstract
We detected high Rydberg states of Ar which had energies close to the 2Po3/2 first ionization potential by laser-induced fluorescence-dip spectroscopy, and observed the Stark spectra of the high Rydberg states in well-defined electric fields. The detection was carried out by a two-step laser excitation technique (4s[3/2]o2→4p[3/2]2→high Rydberg states). In the presence of electric fields, the Stark mixing made the 4p[3/2]2→np forbidden transitions observable. It has been shown that the Stark shift of the np state is a good measure for the determination of the electric field strength. A detection limit of 6 V/cm has been demonstrated, which is the most sensitive detection limit when the Stark effect of an inert gas useful for applications is used for the electric field measurement.
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