Abstract
To probe the configuration mixing between the Ba $6snd^{1}D_{2}$ and $^{3}D_{2}$ Rydberg series and the $5d7d^{1}D_{2}$ perturber we have observed the radio-frequency transitions between the $5d7d^{1}D_{2}$ state and the $6s28s^{1}S_{0}$, $6s24f^{3}F_{2}$, and $6s24f^{1}F_{3}$ states using a delayed-field-ionization approach. The transitions are observed in the presence of small (\ensuremath{\sim}1 V/cm) electric fields, and from the Stark shifts of the transitions we are able to estimate the $^{1}D$ and $^{3}D$ Rydberg fractions of the $5d7d$ state. Our measured zero-field term separations tie together previous optical measurements of the various Rydberg series involved. In addition, we have measured the lifetimes of the $6snd$ states in the vicinity of the $5d7d$ perturber to estimate the fraction of $5d7d$ character in each of the Rydberg states. The values we find for the configuration mixing are in reasonable agreement with those determined by a multichannel-quantum-defect-theory analysis of the optical spectrum of the even-parity $J=2$ states of Ba.
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