Measuring the spin polarization of alkali-metal atoms using nuclear magnetic resonance frequency shifts of noble gases

Abstract

We report a novel method of measuring the spin polarization of alkali-metal atoms by detecting the NMR frequency shifts of noble gases. We calculated the profile of 87Rb D1 line absorption cross sections. We then measured the absorption profile of the sample cell, from which we calculated the 87Rb number densities at different temperatures. Then we measured the frequency shifts resulted from the spin polarization of the 87Rb atoms and calculated its polarization degrees at different temperatures. The behavior of frequency shifts versus temperature in experiment was consistent with theoretical calculation, which may be used as compensative signal for the NMRG closed-loop control system.

Spin-Exchange-Pumped NMR Gyros

“…The authors feel that it is timely to present a more detailed treatment of the physics of spin-exchange-pumped NMRGs, in particular as implemented in the Litton/NGC design. A parallel development has begun in China (Liu et al, 2015), and a related approach with applications to Xe edm searches is being pursued in Japan (Yoshimi et al, 2008). Although the individual components of NMRGs have been studied in other contexts, the realization of hyperpolarized gas techniques into a small physical package with remarkable capabilities vis-a-vis sensitivity, accuracy, while simultaneously maintaining an impressive bandwidth are of considerable current research interest.…”

Electron and nuclear spin polarization in Rb-Xe spin-exchange optical hyperpolarization

“…The former values are based on numerical simulations, and the latter are measured ones. In particular, Liu et al [69] have estimated the polarization to be in the range of 60%-70% in a Rb-Xe SEOP experiment, based on the measured experimental frequency shifts and the κ value of 493 ± 31 [11].…”

Transient electromagnetically induced transparency spectroscopy of 87Rb atoms in buffer gas

“…We come to a conclusion that the unique transient spectral character can serve as an unambiguous method to determine the transverse decay process quantitatively, rather than the usual ones that extract the decaying information from the 073201-4 spectral frequency shift. [11,24] Since the sharp transmission at t = 200 µs is mainly determined by γ d in the numerical test, we can extract this local data out and take it to character the transverse dynamics. A typical simulation for matching the experimental observation is given in Fig.…”

“…[10] Liu et al experimentally measured the spin relaxation of the alkali-metal atoms in a cell by detecting the frequency shifts due to the spin-exchange interaction. [11] The spin relaxation effect of the magnetic-field gradient has also been discussed and the transverse spin relaxation time is determined by using the magnetic resonance linewidths. [12] Recently the timedomain Franzen and Ramsey measurements have been used to produce high-resolution images caused by the transverse relaxation time in the Rb cell using a microwave cavity.…”