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We report the measurement of absolute excitation frequencies of 87Rb to nSand nD Rydberg states. The Rydberg transition frequencies are obtained byobserving electromagnetically induced transparency on a rubidium vapor cell.The accuracy of the measurement of each state is < 1 MHz, which is achieved byfrequency stabilizing the two diode lasers employed for the spectroscopy to afrequency comb and a frequency comb calibrated wavelength meter, respectively.Based on the spectroscopic data we determine the quantum defects of 87Rb, andcompare it with previous measurements on 85Rb. We determine the ionizationfrequency from the 5S1/2(F=1) ground state of 87Rb to 1010.0291646(3) THz,providing the binding energy of the ground state with an accuracy improved bytwo orders of magnitude.

Measurement of absolute transition frequencies of 87Rb to nS and nD Rydberg states by means of electromagnetically induced transparency