Table 3 Fractional frequency shifts and uncertainties from different systematic effects in the 87Sr optical lattice clock at JILA [89]
From: Measuring the stability of fundamental constants with a network of clocks
87Sr effect | Shift /10−18 | Uncertainty /10−18 |
|---|---|---|
Blackbody radiation (environment) | −4974.1 | 0.2 |
Blackbody radiation (coefficient) | – | 1.5 |
Lattice AC Stark | −21.3 | 1.2 |
Density | −12.3 | 0.4 |
Background gas | −3.7 | 0.4 |
d.c. Stark | 0.0 | 0.3 |
Second-order Zeeman | −176.9 | 0.2 |
Servo | 0.0 | 0.2 |
Total | Â | 2.0 |