Abstract
The fine-structure (fs) intervals and polarizabilities of K $n=15\ensuremath{-}20$ $d$ states have been measured using a radio-frequency resonance-selective field-ionization approach. Although there is no apparent difference in the field-ionization characteristics of the ${d}_{\frac{3}{2}}$ and ${d}_{\frac{5}{2}}$ states when excited in zero electric field, we are able to observe the resonances by using a small dc electric field and time-resolved detection. The fine-structure intervals of the K $d$ states for $n\ensuremath{\sim}20$ are inverted. Specifically, the observed fs intervals (in MHz) are: $15d$, -375.33(40); $16d$, -306.25(15); $18d$, -211.68(20); $20d$, -152.42(45). The observed tensor polarizabilities [in MHz/${(\mathrm{V}/\mathrm{c}\mathrm{m})}^{2}$] are: $15d$, -0.0208(9); $16d$, -0.0315(8); $18d$, -0.0681(18); $20d$, -0.1349(40).
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