Experiment and Dynamic Simulations of Radiation Damping of Laser-polarized liquid 129Xe at low magnetic field in a flow system

Abstract

Radiation damping is generally observed when the sample with high spin concentration and high gyro-magnetic ratio is placed in a high magnetic field. However, we firstly observed liquid state 129Xe radiation damping using laser-enhanced nuclear polarization at low magnetic field in a flow system in which the polarization enhancement factor for the liquid state 129Xe was estimated to be 5000, and furthermore theoretically simulated the envelopes of the 129Xe FID and spectral lineshape in the presence of both relaxation and radiation damping with different pulse flip angles and ratios of T2*/Trd. The radiation damping time constant Trd of 5 ms was derived based on the simulations. The reasons of depolarization and the further possible improvements were also discussed.