Atomic unit of electric dipole moment
UnitsMeasured
= 8.478 353 6198(13) × 10−30 C m
- Value
- 8.478 353 6198 × 10−30 C m
- Standard uncertainty
- 1.3 × 10−39 C m
- Relative uncertainty
- 1.5 × 10−10 (153 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# atomic unit of electric dipole moment, CODATA 2022 (NIST)
atomic_unit_of_electric_dipole_moment = 8.4783536198e-30 # C m, standard uncertainty 1.3e-39
# SciPy: scipy.constants.physical_constants['atomic unit of electric dipole mom.']What it is
The unit of electric 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 | 8.478 353 6198(13) × 10−30 | 1.5 × 10−10 | −4.4 σ of 2018 |
| 2018 | 8.478 353 6255(13) × 10−30 | 1.5 × 10−10 | +1.4 σ of 2014 |
| 2014 | 8.478 353 552(52) × 10−30 | 6.1 × 10−9 | +1.5 σ of 2010 |
| 2010 | 8.478 353 26(19) × 10−30 | 2.2 × 10−8 | +2.1 σ of 2006 |
| 2006 | 8.478 352 81(21) × 10−30 | 2.5 × 10−8 | −0.4 σ of 2002 |
| 2002 | 8.478 353 09(73) × 10−30 | 8.6 × 10−8 | +1.3 σ of 1998 |
| 1998 | 8.478 352 67(33) × 10−30 | 3.9 × 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).