We propose a fast and accurate method for Xe-129-Rb spin-exchange rate determination based on an atomic magnetometer at low magnetic field and low pressure. The Xe-129-Rb spin-exchange rate can be estimated via the product of the maximum transverse spin polarization of Xe-129 nuclei and the corresponding Rabi frequency. The velocity-averaged binary spin-exchange cross section and the rate constant for spin-exchange in Xe-129-Rb van der Waals complexes are measured to be (SE) = (1.26 +/- 0.13) x 10(-16)cm(3)/s and kappa 4(He )= 1326 +/- (47) s(-1) in He-4 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. (C) 2020 Optical Society of America
展开▼
