Abstract
We have performed precise NMR measurements in order to calibrate a standard optical technique for measuring the polarization of nuclei. This optical technique requires knowledge of the pressure-dependent relationship between the nuclear polarization and the degree of circular polarization of the 668-nm light emitted from a discharge. We determined the nuclear polarization by comparing the adiabatic fast-passage NMR signal from samples of polarized at pressures between 0.1 and 5 torr to an identical sample of water. For water, the polarization is known from statistical mechanics. The is polarized using the metastability exchange technique for optical pumping of . The accuracy of the calibration is ±2%, which is required for applications in nuclear physics.
- Received 29 June 1992
DOI:https://doi.org/10.1103/PhysRevA.47.468
©1993 American Physical Society