Abstract
A very weak perturbation around the 6${\mathit{s}}^{2}$52d $^{2}$${\mathit{D}}_{3/2}$ high Rydberg series of Lu has been studied. A line-intensity distribution of the 6${\mathit{s}}^{2}$nd $^{2}$${\mathit{D}}_{3/2}$ optical transitions exhibits a well-developed Beutler-Fano interference profile with a significant decrease of the radiative lifetime by the configuration interaction. An accurate energy-level structure of the perturbed series is determined by measuring microwave two-photon transitions among the 6${\mathit{s}}^{2}$${\mathit{nd}}^{2}$${\mathit{D}}_{3/2}$ series. The optical line-intensity profiles are analyzed directly by using the eigenfunctions of the perturbed Rydberg series derived from the microwave data. The results are compared with those obtained by the configuration-interaction theory developed by Fano [Phys. Rev. 124, 1866 (1961)].
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