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Published January 1, 1993 | public
Journal Article Open

NMR calibration of optical measurement of nuclear polarization in 3He


We have performed precise NMR measurements in order to calibrate a standard optical technique for measuring the polarization of 3He 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 3He discharge. We determined the nuclear polarization by comparing the adiabatic fast-passage NMR signal from samples of polarized 3He at pressures between 0.1 and 5 torr to an identical sample of water. For water, the polarization is known from statistical mechanics. The 3He is polarized using the metastability exchange technique for optical pumping of 3He. The accuracy of the calibration is ±2%, which is required for applications in nuclear physics.

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©1993 The American Physical Society Received 29 June 1992 We gratefully acknowledge the help of Al Massey for designing and building the NMR electronics. We thank Robert Carr and Gabor Faludi for preparing many cells, and Jim Pendlay and Jack Richards for their technical support. We give special thanks for our interaction with Michele Leduc at L'Ecole Normale Superieure and appreciate useful conversations with Kevin Lee, Cathleen Jones, and Laird Schearer. This work was supported by the National Science Foundation Grant Nos. PHY88-17296 and PHY91-15574.


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