Velocity-selective spectroscopy measurements of Rydberg fine structure states in a hot vapor cell

TL;DR

This paper introduces a velocity-selective spectroscopy method for high-resolution measurement of Rydberg state spectra in hot vapor cells, enabling precise observation of hyperfine and fine-structure splittings at room temperature.

Contribution

The work presents a novel velocity-selective spectroscopy technique that achieves Doppler-free resolution of Rydberg fine structure in a hot vapor cell, aligning experimental results with theoretical predictions.

Findings

High-resolution measurement of Rydberg fine-structure splitting

Velocity-selective hyperfine splitting observed in hot vapor

Excellent agreement between experiment and theory

Abstract

A velocity-selective spectroscopy technique for studying the spectra from hot Rydberg gases is presented. This method provides high-resolution measurement of the spectrum interval. Based on this method, the velocity-selective hyperfine splitting of intermediate states is measured, as well as the Doppler-free fine-structure splitting of the Rydberg states via two-photon Rydberg excitation in a room-temperature 133Cs vapor cell. The experiment data and theoretical predictions show excellent agreement.