2022/01/09 by Sheng Zou, Zou, S., Morin, D. J. +5
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Quantum optics and atomic interactions
paper · pdf · doi:10.48550/arxiv.2201.02902
openalex publication_date 2022/01/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report a measurement of the ratio of dimensionless enhancement factors κ0 for Cs-129Xe and Rb-129Xe in the temperature range 115-140 ∘C; both pairs are used in spin-exchange optical pumping (SEOP) to produce hyperpolarized 129Xe. κ0 characterizes the amplification of the 129Xe magnetization contribution to the alkali-metal electronic effective field, compared to the case of a uniform continuous medium in classical magnetostatics. The measurement was carried out in "hybrid" vapor cells containing both Rb and Cs metal in a prescribed ratio, producing approximately the same vapor density for both. Alternating measurements of the optically detected EPR frequency shifts caused by the SEOP polarization and subsequent sudden destruction of the same quantity of 129Xe magnetization were made for 133Cs and either 87Rb or 85Rb. An important source of systematic error caused by power fluctuations in the pump laser that produced variable light shifts in the EPR frequency was characterized and then mitigated by allowing sufficient warm-up time for the pump laser. We measured (κ0)\rm CsXe/(κ0)\rm RbXe = 1.215 ± 0.007 with no apparent temperature dependence. Based on our previous measurement (κ0)\rm RbXe=518 ± 8, we determine (κ0)\rm CsXe = 629 ± 10, more precise than but consistent with a previous measurement made by another research group.