| Autor: |
Peper, Michael, Helmrich, Felix, Butscher, Jonas, Agner, Josef Anton, Schmutz, Hansjürg, Merkt, Frédéric, Deiglmayr, Johannes |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Peper, M. et al. Precision measurement of the ionization energy and quantum defects of $^{39}\mathrm{K}$ I, Phys. Rev. A 100, 012501 (2019) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.100.012501 |
| Popis: |
We present absolute-frequency measurements in ultracold 39K samples of the transitions from the ground state to np Rydberg states. A global nonlinear regression of the np1/2 and np3/2 term values yields an improved wave number of 35009.8139710(22)(sys)(3)(stat) cm-1 for the first ionization threshold of 39K and the quantum defects of the np1/2 and np3/2 series. In addition, we report the frequencies of selected one-photon transitions n's <- np3/2, n'd <- np3/2, n'f <- nd and n'g <- nf and two-photon transitions nf <- np determined by millimeter-wave spectroscopy. By combining the results from the laser and millimeter-wave spectroscopic experiments, we obtain improved values for the quantum defects of the s1/2, d3/2, d5/2, f and g states. For the d series, the inverted fine structure was confirmed for n >= 32. The fine-structure splitting of the f series is less than 100 kHz at n=31, significantly smaller than the hydrogenic splitting, and the fine structure of the g series is regular for n >= 30, with a fine-structure splitting compatible with the hydrogenic prediction. From the measured quantum defects of the f and g series we derive an estimate for the static dipole and quadrupole polarizabilities of the K+ ion core. Additionally, the hyperfine splitting of the 4s1/2 ground state of 39K was determined to be 461.719700(5) MHz using radio-frequency spectroscopy and Ramsey-type interferometry. |
| Databáze: |
arXiv |
| Externí odkaz: |
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