Lee Deok-Young, Lee Sangkyung, Yim Sin Hyuk
Appl Opt. 2021 Aug 20;60(24):7290-7296. doi: 10.1364/AO.427613.
We demonstrate the measurement of the transverse spin relaxation rate of Xe without the influence of the Rb polarization-induced magnetic field gradient. The optical pumping beam and probe beam turn on and off repeatedly during the measurement to reduce the relaxation originating from the Rb polarization-induced magnetic field gradient. During the absence of the optical pumping beam, the nuclear spin of the noble gas atom does not experience the alkali-polarization-induced magnetic field gradient so that the transverse spin relaxation rate (1/) decreases. When the duty cycle reaches zero, the measured transverse relaxation time approaches the longitudinal spin relaxation time . Our method helps in roughly estimating the longitudinal spin relaxation time with a single measurement of the free induction decay.
我们展示了在没有铷极化诱导磁场梯度影响的情况下对氙横向自旋弛豫率的测量。在测量过程中，光泵浦光束和探测光束反复开启和关闭，以减少源于铷极化诱导磁场梯度的弛豫。在没有光泵浦光束时，稀有气体原子的核自旋不会经历碱极化诱导的磁场梯度，从而横向自旋弛豫率（1/）降低。当占空比达到零时，测量到的横向弛豫时间接近纵向自旋弛豫时间。我们的方法有助于通过单次测量自由感应衰减来粗略估计纵向自旋弛豫时间。
