Improved ionization potential of calcium using frequency-comb-based Rydberg spectroscopy
Improved ionization potential of calcium using frequency-comb-based Rydberg spectroscopy
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DOI：
10.1103/physreva.106.062818
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发表时间：
2022-11
影响因子：
2.9
通讯作者：
C.R. Pak;Matthew Schlitters;S. Bergeson
中科院分区：
文献类型：
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作者：
C.R. Pak;Matthew Schlitters;S. Bergeson
我们报告新的频率梳为基础的测量钙里德伯能级。在390 nm和423 nm波长的反向传播激光束作用下，Ca原子从4s^2 ~^1\mbox{S}_0$基态被激发到4sns ~^1\mbox{S}_0$里德堡能级，其中n$在40 ~ 110之间.近共振双光子双色激发使消除一阶多普勒频移成为可能。由此产生的线形是对称的和高斯的。我们验证激光计量学和绝对精度，通过复制测量众所周知的转换Cs，接近我们的倍频钛：蓝宝石激光器的基本波长。从测得的跃迁能，我们推导出电离势的钙，$E_{\rm IP} = 1，478，154，283.42 \pm 0.08 \mbox{（统计）} \pm 0.07 \mbox{（系统）}$ MHz，提高了以前的最佳测定的11倍。
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.