Affiliation:
1. School of Instrument Science and Opto‐Electronics Engineering Beihang University Beijing 100191 China
2. Zhejiang Provincial Key Laboratory of Ultra‐Weak Magnetic‐Field Space and Applied Technology Hangzhou Innovation Institute, Beihang University Hangzhou 310051 China
3. Hefei National Laboratory Hefei 230088 China
Abstract
AbstractAn efficient method is proposed for quantifying rubidium vapor density by analyzing the spin‐exchange rate between alkali metals. This method effectively addresses two primary challenges in measuring alkali vapor density. First, it overcomes the limitation of absorption spectroscopy to measure vapor density under optically thick conditions, typically restricted to temperature higher than 420K, equivalent to alkali vapor density exceeding . Second, it mitigates the risk of disrupting shielding functionality due to the application of a strong magnetic field, often in the range of several tens of Gauss or higher, when employing the Faraday rotation for vapor‐density measurement. The spin‐exchange rate between atoms, inherently related to the vapor density, is evident in the electron‐paramagnetic‐resonance spectrum of spin‐polarized , thereby providing a possibility for measuring alkali vapor density. To eliminate overlap between two Lorentzian curves resulting from two decomposed components of an oscillating field, a small rotating magnetic field with identical amplitude and frequency but a 90‐degree phase shift along both the x and y axes is applied. This method is successfully employed to measure vapor density in the temperature range of 373–433 K, with the measured outcomes closely matching the saturation vapor curve.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Cited by
1 articles.
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