A method for measuring the spin polarization of 129Xe by using an atomic magnetometer

Abstract

We propose a method for the precise determination of nuclear spin polarization, based on the atomic magnetometers, which employs the effective magnetic field produced by the spin polarization of 129Xe nuclei. This effective magnetic field can be estimated by measuring the initial induced voltage of the Free Induction Decay (FID) signal of the 129Xe nuclei, which is based on the calibration coefficient between the transverse magnetic field and the output voltage signal of the atomic magnetometer, by using an off-resonant transverse driven magnetic field. Compared with the method based on measuring the longitudinal relaxation time of the 129Xe nuclei and the spin polarization of alkali-metal atoms, our method can directly measure the nuclear spin polarization, without being affected by inaccuracies in the measurement of the spin polarization of alkali-metal atoms.

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

“…, and then the mean error is figured out to illustrate the calibration accuracy [16,25]. The coil constant in the X direction is approximately 323.1 nT/mA, with a mean error of 0.28 nT/mA.…”

Pump beam influence on spin polarization homogeneity in the nuclear magnetic resonance gyroscope

“…where is the γ Xe gyromagnetic ratio of Xe, κ 0 is the enhancement factor of Rb-129 Xe, µ 0 is the permeability of the free space, µ B is the Bohr magneton and g s is the g-factor of electrons. Moreover, the nuclear spin polarization was measured by the free induction decay (FID) method [32]. A π/2 pulse was applied on noble gas atoms and FID signal was collected by an NI DAQ card.…”

Design of a multi-laser module for optical pumping in compact atomic gyroscopes

“…The average polarization in the vapor cell of Xe is measured according to the free-induction-decay (FID) method, 33 and the results are given in Fig. 9 and Table 1.…”