论文标题
使用基于频率的Rydberg光谱法改善了钙的电离电位
Improved ionization potential of calcium using frequency-comb based Rydberg spectroscopy
论文作者
论文摘要
我们报告了基于CA Rydberg能量水平的新的基于频率的测量。从$ 4S^2〜^1 \ mbox {s} _0 $地面状态到$ 4SNS〜^1 \ mbox {s} _0 $ rydberg rydberg的水平，从$ N $ ryd twosey twosey twosey twoson twoson，反向传递激光光束从$ 4S^2〜^1 \ mbox {s} _0 $地面状态到$ 4SNS〜^1 \ mbox {s} _0 $ rydberg rydberg级别，$ n $ rydberg的水平，从40倍到110的imm and twement a and twement。可以消除一阶多普勒移位。最终的线形是对称和高斯。我们通过重现CS中众所周知的过渡的测量，验证激光计量学和绝对精度，接近我们频率加倍的Ti：蓝宝石激光器的基本波长。从测得的过渡能中，我们得出Ca的电离电位，$ e _ {\ rm ip} = 1、478、154、283.42 \ pm 0.08 \ mbox {（statistics）} \ pm 0.07 \ pm 0.07 \ pm 0.07 \ mbox {（systematic）} $ MHz，改善以前的最佳确定。
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 $4s^2~^1\mbox{S}_0$ ground state to $4sns~^1\mbox{S}_0$ 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.
