Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.253001
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Funding
- NSF [GOALI PHY1306880]
- Northrop Grumman Corporation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1306880] Funding Source: National Science Foundation
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We demonstrate a new approach to precision NMR with hyperpolarized gases designed to mitigate NMR shifts due to the alkali spin-exchange field. The NMR bias field is implemented as a sequence of alkali (Rb) 2 pi pulses, allowing the Rb polarization to be optically pumped transverse to the bias field. When the Rb polarization is modulated at the noble-gas (Xe) NMR resonance, spin-exchange collisions buildup a precessing transverse Xe polarization. We study and mitigate novel NMR broadening effects due to the oscillating spin-exchange field. Spin-exchange frequency shifts are suppressed 2500x, and Rb magnetometer gain measurements project photon shot-noise limited NMR frequency uncertainties below 10 nHz/root Hz.
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