Atomic unit of electric polarizability
UnitsMeasured
= 1.648 777 272 12(51) × 10−41 C2 m2 J−1
- Value
- 1.648 777 272 12 × 10−41 C2 m2 J−1
- Standard uncertainty
- 5.1 × 10−51 C2 m2 J−1
- Relative uncertainty
- 3.1 × 10−10 (309 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# atomic unit of electric polarizability, CODATA 2022 (NIST)
atomic_unit_of_electric_polarizability = 1.64877727212e-41 # C^2 m^2 J^-1, standard uncertainty 5.1e-51
# SciPy: scipy.constants.physical_constants['atomic unit of electric polarizability']What it is
The unit of electric polarizability 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 | 1.648 777 272 12(51) × 10−41 | 3.1 × 10−10 | −4.5 σ of 2018 |
| 2018 | 1.648 777 274 36(50) × 10−41 | 3.0 × 10−10 | +1.1 σ of 2014 |
| 2014 | 1.648 777 2731(11) × 10−41 | 6.7 × 10−10 | −1.4 σ of 2010 |
| 2010 | 1.648 777 2754(16) × 10−41 | 9.7 × 10−10 | +6.4 σ of 2006 |
| 2006 | 1.648 777 2536(34) × 10−41 | 2.1 × 10−9 | −1.3 σ of 2002 |
| 2002 | 1.648 777 274(16) × 10−41 | 9.7 × 10−9 | +1.3 σ of 1998 |
| 1998 | 1.648 777 251(18) × 10−41 | 1.1 × 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).