Rydberg-EIT of $^{85}$Rb vapor in a cell with Ne buffer gas

• URL: http://arxiv.org/abs/2308.07554v1
• Date: Tue, 15 Aug 2023 03:48:20 GMT
• Title: Rydberg-EIT of $^{85}$Rb vapor in a cell with Ne buffer gas
• Authors: Nithiwadee Thaicharoen, Ryan Cardman, Georg Raithel
• Abstract summary: We investigate Rydberg electromagnetically induced transparency (EIT) of $85$Rb atomic vapor in a glass cell. EIT lines exhibit a positive frequency shift of about 70MHz and a broadening of about 120MHz, with minimal dependence on the principal quantum number of the Rydberg states.
• Score: 0.9208007322096533
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate Rydberg electromagnetically induced transparency (EIT) of $^{85}$Rb atomic vapor in a glass cell that contains a 5-Torr neon buffer gas. At low probe power, EIT lines exhibit a positive frequency shift of about 70~MHz and a broadening of about 120~MHz, with minimal dependence on the principal quantum number of the Rydberg states. The EIT line shift arises from s-wave scattering between the Rydberg electron and the Ne atoms, which induces a positive shift near 190~MHz, and from the polarization of the Ne atoms within the Rydberg atom, which adds a negative shift near -120~MHz. The line broadening is largely due to the Ne polarization. Our experimental results are in good qualitative agreement with our theoretical model, in which the shift is linear in buffer-gas density. Our results suggest that Rydberg-EIT can serve as a direct spectroscopic probe for buffer-gas density at low pressure, and that it is suitable for non-invasive measurement of electric fields in low-pressure noble-gas discharge plasmas and in dusty plasmas.

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