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- W4313484089 abstract "We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counter-propagating laser beams at 390 nm and 423 nm excite Ca atoms from the $4s^2~^1mbox{S}_0$ ground state to $4sns~^1mbox{S}_0$ Rydberg levels with $n$ ranging from 40 to 110. Near-resonant two-photon two-color excitation of atoms in a thermal beam makes it possible to eliminate the first-order Doppler shift. The resulting lineshapes are symmetric and Gaussian. We verify laser metrology and absolute accuracy by reproducing measurements of well-known transitions in Cs, close to the fundamental wavelengths of our frequency-doubled ti:sapphire lasers. From the measured transition energies we derive the ionization potential of Ca, $E_{rm IP} = 1, 478, 154, 283.42 pm 0.08 mbox{(statistical)} pm 0.07 mbox{(systematic)}$ MHz, improving the previous best determination by a factor of 11." @default.
- W4313484089 created "2023-01-06" @default.
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- W4313484089 date "2022-12-21" @default.
- W4313484089 modified "2023-09-27" @default.
- W4313484089 title "Improved ionization potential of calcium using frequency-comb-based Rydberg spectroscopy" @default.
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- W4313484089 doi "https://doi.org/10.1103/physreva.106.062818" @default.
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