Abstract
We propose a fast and accurate method for $^ {129} {\rm Xe}{-}{\rm Rb}$ spin-exchange rate determination based on an atomic magnetometer at low magnetic field and low pressure. The $^ {129} {\rm Xe}{-}{\rm Rb}$ spin-exchange rate can be estimated via the product of the maximum transverse spin polarization of $^ {129} {\rm Xe}$ nuclei and the corresponding Rabi frequency. The velocity-averaged binary spin-exchange cross section and the rate constant for spin-exchange in $^ {129} {\rm Xe}{-}{\rm Rb}$ van der Waals complexes are measured to be ${\langle \sigma \nu \rangle _{{\rm SE}}} = ( {1.26 \pm 0.13} ) \times {10^{ - 16}}\;{{\rm cm}^ 3 }{\rm /s}$ and ${\kappa _{^4{\rm He}}} = 1326 \pm (47)\,{{\rm s}^{ - 1 }}$ in $^4{\rm He}$ buffer gas, respectively. With respect to the method based on the longitudinal relaxation rate, the method presented in this work can greatly facilitate the measurement process, determining the spin-exchange rate in several minutes. Moreover, this method is more suitable for vapor cells with long longitudinal relaxation time.
© 2020 Optical Society of America
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