chanhyun Pak | Brigham Young University (original) (raw)
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Papers by chanhyun Pak
Physical Review A
We report frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser... more We report frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser beams at 390 and 423 nm excite Ca atoms from the 4s 2 1 S 0 ground state to 4sns 1 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 line shapes 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 IP = 1 478 154 283.42 ± 0.08(statistical) ± 0.07(systematic) MHz, improving the previous determinations by a factor of 11.
Cornell University - arXiv, Nov 4, 2022
We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating l... more We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser beams at 390 nm and 423 nm excite Ca atoms from the 4s 2 1 S0 ground state to 4sns 1 S0 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, EIP = 1, 478, 154, 283.42 ± 0.08(statistical) ± 0.07(systematic) MHz, improving the previous best determination by a factor of 11.
Physical Review A
We report frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser... more We report frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser beams at 390 and 423 nm excite Ca atoms from the 4s 2 1 S 0 ground state to 4sns 1 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 line shapes 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 IP = 1 478 154 283.42 ± 0.08(statistical) ± 0.07(systematic) MHz, improving the previous determinations by a factor of 11.
Cornell University - arXiv, Nov 4, 2022
We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating l... more We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counterpropagating laser beams at 390 nm and 423 nm excite Ca atoms from the 4s 2 1 S0 ground state to 4sns 1 S0 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, EIP = 1, 478, 154, 283.42 ± 0.08(statistical) ± 0.07(systematic) MHz, improving the previous best determination by a factor of 11.