Abstract

We have measured the absolute frequency of the excited state transition 5P324D52 in a Rb87 atom with a femtosecond frequency comb, utilizing the recently developed spectroscopic technique of the double resonance optical pumping method. The absolute energy level of the 4D52 state is determined by measuring the absolute frequency of the 5S125P32 transition simultaneously. The hyperfine structure constants of the 4D52 state are obtained by using the measured frequency. The magnetic dipole constant, A, is determined to be (16.747±0.010)MHz with an uncertainty reduced 60-fold compared with a previous result. The electric quadrupole constant, B, is determined, for what is to our knowledge the first time, to be (4.149±0.059)MHz.

© 2007 Optical Society of America

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