Abstract
High Rydberg states of the krypton atom have been investigated at high resolution by vacuum ultraviolet--millimeter wave double-resonance spectroscopy. The measurement of Stark shifts in the spectra of these high Rydberg states is used to determine electric fields with a $\ifmmode\pm\else\textpm\fi{}20\ensuremath{\mu}\mathrm{V}/\mathrm{cm}$ accuracy. The analysis of spectral line shapes provides information on inhomogeneous electric field distributions in the experimental volume.
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