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Journal of the Physical Society of Japan

Measurements of Relative Transition Oscillator Strengths of Rydberg States in Cesium Magneto-Optical Trap

Limei Wang, Xiao-Meng Liu, Hao Zhang, Junling Che, Yonggang Yang, Jianming Zhao, Suotang Jia

Published Sep 30, 2012• 10 citations
Publisher

Abstract

The oscillator strengths of 6 P 3/2 → n S / n D transitions are measured by fitting ultracold Cs Rydberg atom field-ionized spectra. The oscillator strength ratios η( n ) = f D 5/2 ( n )/ f D 3/2 ( n ) and ρ( n ) = f S 1/2 ( n + 2)/ f D 3/2 ( n ), which agree with the calculations based on the wave functions obtained by Numerov's method, are determined. The obtained results indicate that the ratios are almost independent of the principal quantum number n .

DOI
10.1143/jpsj.81.104302

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Results from measurement of the energy levels of ultra-cold Rydberg states of 39 K in an AC-Magneto-Optical Trap are presented. Rydberg atoms are produced by stepwise excitation from the laser-excited 4 2 P 1 / 2 states using a tunable blue dye laser. Energy level data for principal quantum numbers n = 18 up to n = 199 are reported. For n = 18 to n = 46 , the measured levels are in good agreement with the available data from the National Institute of Standards and Technology (NIST) list of atomic spectral lines. New values for the parameters in the Rydberg-Ritz formula were then calculated from a fit to the measured energy level data. Atomic transition energies for n = 47 to n = 199 are also reported for the first time. Shifts in the levels for excitation to both the 2 S 1 / 2 and 2 D 3 / 2 states at principal quantum number n > 100 are found when compared to calculations derived from the revised Rydberg-Ritz formula. These deviations are due to the greater probability of overlap between the wavefunctions of the excited atoms in the ensemble, resulting in strong interaction between the Rydberg atoms which are in close proximity. For n > 167, the D-state energies were unresolved.