Microwave spectroscopy assisted by electromagnetically induced transparency near natural Förster resonance on rubidium

Precise measurements of quantum defects are essential for refining theories and obtaining more precise values for various atomic properties, such as dipole moment. In this study, we have performed microwave spectroscopy by monitoring the EIT signal between the nD_5/2 and (n+2)P_3/2 and (n − 2)F_7/2 states, for n = 41 to 46, in a rubidium vapor cell. This interval is interesting because of the occurrence of a Förster resonance. We compare the obtained results with measurements made by other groups for the P_3/2 [1] and F_7/2 [2] series, allowing us to validate the best-measured quantum defect values. This validation is particularly crucial due to the emergence of discrepant values in recent years. We conclude that the measurements by Li and Han et al. are the most suitable for use, highlighting the reliability and consistency of these data.

[1] LI, W. et al. Millimeter-wave spectroscopy of cold rb Rydberg atoms in a magneto-optical trap: quantum defects of the ns, np, and nd series. Physical Review A, APS, v. 67, n. 5, p. 052502, 2003.

[2] HAN, J. et al. Rb n f quantum defects from millimeter-wave spectroscopy of cold rb 85 Rydberg atoms. Physical Review A, APS, v. 74, n. 5, p. 054502, 2006.