Shielded helion gyromagnetic ratio = 2.037 894 6078 × 108 s⁻¹·T⁻¹

Value
2.037 894 6078 × 108
Unit
s⁻¹·T⁻¹
Uncertainty
0.000 000 0018 × 10⁸
Copy-ready
2.0378946078e8

Gyromagnetic ratio of the helion as measured in helium-3 gas, a reference for NMR field calibration: its magnetic moment divided by its spin angular momentum.

Multiplied by a magnetic field it gives the precession (Larmor) frequency — the frequency NMR and MRI machines tune to. The MHz/T form beneath is the one scanner engineers use.

The same quantity, other ways NIST lists it

Quantity (NIST name)ValueUnitUncertainty
Shielded helion gyromagnetic ratio in MHz/T32.434 100 033MHz·T⁻¹0.000 000 028

NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.

Magnetic moments, g-factors and gyromagnetic ratios

Deuteron magnetic momentElectron magnetic momentElectron g factorElectron gyromagnetic ratioElectron magnetic moment anomalyHelion g factorHelion magnetic momentHelion shielding shiftMuon g factorMuon magnetic momentMuon magnetic moment anomalyNeutron magnetic momentNeutron g factorNeutron gyromagnetic ratioProton g factorProton gyromagnetic ratioProton magnetic momentProton magnetic shielding correctionShielded helion gyromagnetic ratioShielded helion magnetic momentShielded proton gyromagnetic ratioShielded proton magnetic momentShielding difference of d and p in HDShielding difference of t and p in HTTriton g factorTriton magnetic moment

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All physical constants

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