Atomic unit of magnetic dipole moment
UnitsMeasured
= 1.854 802 013 15(58) × 10−23 J T−1
- Value
- 1.854 802 013 15 × 10−23 J T−1
- Standard uncertainty
- 5.8 × 10−33 J T−1
- Relative uncertainty
- 3.1 × 10−10 (313 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# atomic unit of magnetic dipole moment, CODATA 2022 (NIST)
atomic_unit_of_magnetic_dipole_moment = 1.85480201315e-23 # J T^-1, standard uncertainty 5.8e-33
# SciPy: scipy.constants.physical_constants['atomic unit of mag. dipole mom.']What it is
The unit of magnetic dipole moment in the Hartree system of atomic units, where the electron mass, the elementary charge, ħ and 4πε₀ are all set to 1. Its value here is the SI equivalent of one atomic unit.
How the value changed, 1998–2022
Each point is one CODATA adjustment, plotted as its difference from the 2022 value; the bars show one standard uncertainty (an arrowhead means the bar runs off the chart).
Relative uncertainty
| CODATA | Value (uncertainty) | Relative uncertainty | Change from previous |
|---|---|---|---|
| 2022 | 1.854 802 013 15(58) × 10−23 | 3.1 × 10−10 | −4.5 σ of 2018 |
| 2018 | 1.854 802 015 66(56) × 10−23 | 3.0 × 10−10 | +1.5 σ of 2014 |
| 2014 | 1.854 801 999(11) × 10−23 | 5.9 × 10−9 | +1.5 σ of 2010 |
| 2010 | 1.854 801 936(41) × 10−23 | 2.2 × 10−8 | +2.3 σ of 2006 |
| 2006 | 1.854 801 830(46) × 10−23 | 2.5 × 10−8 | −0.4 σ of 2002 |
| 2002 | 1.854 801 90(16) × 10−23 | 8.6 × 10−8 | +1.3 σ of 1998 |
| 1998 | 1.854 801 799(75) × 10−23 | 4.0 × 10−8 |
“Change from previous” is the shift in the value divided by the standard uncertainty of the previous adjustment. Earlier values are converted into the current unit where NIST changed it (for example J s to J Hz⁻¹).