MICROWAVE SPECTROSCOPY OF BARIUM 5$d_{3/2}$n$\ell $ AUTOIONIZING STATES

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2006

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Ohio State University

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We have observed microwave resonance transitions between the autoionizing Ba $5d_{3/2}ng$ $J = 2$ and $5d_{3/2}(n+1)h$ $J = 3$ states for $45 \leq n \leq 49$. These measurements, made between 50 and 75 GHz, lead to quantum defects of +0.019(2) and +0.003(2) for this pair of $ng$ and $nh$ states. These measurements demonstrate that the core polarization model, widely used to characterize non penetrating Rydberg states, fails to describe Rydberg states converging to anisotropic or non $s$ cores. We believe that this is the first time spectroscopy of autoionizing states using microwaves has been performed.

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Author Institution: Department of Physics, University of Virginia, Charlottesville, VA 22903

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