Table 8 Estimated fractional uncertainties for Cf HCI clocks [30]
From: Measuring the stability of fundamental constants with a network of clocks
Conditions | Cf15+ | Cf17+ | |
|---|---|---|---|
Electric quadrupole | \(|F=3, m_{F}=\pm 2\rangle \rightarrow |F=3,m_{F}=\pm 2\rangle \) with \(|F=3, m_{F}=\pm 2\rangle \) ground state | 0 | 0 |
BBR | \(4.0\pm 0.1~\text{K}\) | ≪10−19 | ≪10−19 |
Quadratic Zeeman | 251Cf with \(\delta B< 0.1~\text{mG}\) | 5 × 10−19 | 1 × 10−18 |
Second order Doppler | Ca+ Doppler limit | 1.5 × 10−19 | 1.5 × 10−19 |