Precision measurement of the ionization energy of Cs i

Deiglmayr, Johannes; Herburger, Holger; Saßmannshausen, Heiner; Jansen, Paul; Schmutz, Hansjürg; Merkt, Frédéric

doi:10.1103/physreva.93.013424

Cited by 55 publications

(57 citation statements)

References 55 publications

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“…For the work presented in this article, the existing setup for high-resolution spectroscopy of cesium Rydberg atoms [8,19] was extended and modified to allow also for the high-resolution spectroscopy of potassium atoms. The atomic-vapor source was replaced by a double-species oven [20], loaded from ampoules containing pure alkali metals, which were cracked under vacuum by squeezing thin copper tubes enclosing the ampoules.…”

Section: Methodsmentioning

confidence: 99%

Precision measurement of the ionization energy and quantum defects ofK39i

et al. 2019

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We present absolute-frequency measurements in ultracold 39 K samples of the transitions from the 4s 1/2 ground state to np 1/2 and np 3/2 Rydberg states. A global nonlinear regression of the np 1/2 and np 3/2 term values yields an improved wave number of 35 009.813 971 0(22)sys(3)stat cm −1 for the first ionization threshold of 39 K and the quantum defects of the np 1/2 and np 3/2 series. In addition, we report the frequencies of selected one-photon transitions n s 1/2 ← np 3/2 , n dj ← np 3/2 , n f j ← ndj and n g j ← nfj and two-photon transitions nf j ← npj determined by millimeter-wave spectroscopy, where j is the total angular momentum quantum number. By combining the results from the laser and millimeter-wave spectroscopic experiments, we obtain improved values for the quantum defects of the s 1/2 , d 3/2 , d 5/2 , fj and gj states. For the dj 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 α d and quadrupole αq polarizabilities of the K + ion core. Additionally, the hyperfine splitting of the 4s 1/2 ground state of 39 K was determined to be 461.719 700(5) MHz using radio-frequency spectroscopy and Ramsey-type interferometry.

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Section: Methodsmentioning

confidence: 99%

Precision measurement of the ionization energy and quantum defects ofK39i

et al. 2019

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“…The frequency of the laser is calibrated with a wavemeter and with a frequency comb. [10] The Rydberg atoms or molecules are detected by applying pulsed electric potentials to a pair of electrodes surrounding the photoexciation region, causing pulsed field ionisation and extraction of the ions towards a charged-particle detector through an ion time-of-flight mass spectrometer. The resulting Cs + and Cs 2+ ions are detected in separate channels, which enables us to detect molecular products resulting from the interaction of Cs Rydberg atoms with other Cs atoms located in their vicinity.…”

Section: Methodsmentioning

confidence: 99%

“…refs [5,6]) and precision measurements of atomic and molecular properties (see e.g. refs [7][8][9][10]). …”

Section: Rydberg States and Long-range Rydberg Moleculesmentioning

confidence: 99%

“…(1)), taking into account the energy dependence of the quantum defect up to the term linear in energy, enabled us to determine the first ionization energy of Cs (E I = hc · 31406.4677325(14) cm −1 ) to extreme precision and to extract improved values of the quantum defects of the p Rydberg series and their energy dependence. [10] Such a high precision and accuracy can only be achieved by careful compensation of stray magnetic and electric fields. We accomplish this by monitoring and minimizing the frequency shifts of the microwave transition between the F = 3 and F = 4 hyperfine components of the 6s 1/2 ground state and of the np 3/2 ← 6s 1/2 transitions using solenoids and electrodes designed for this purpose.…”

Section: Precision Measurements Of Rydberg States Of Csmentioning

confidence: 99%

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Exotic Chemistry with Ultracold Rydberg Atoms

Saßmannshausen

Deiglmayr

Merkt

2016

Chimia

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We review recent experiments carried out with dense (1012 cm–3) ultracold (T = 40 ?K) samples of Cs atoms which have the goal to characterize, by high-resolution spectroscopy, the interactions between Cs atoms, Cs+ ions and electrons that lead to the formation of metastable long-range molecules. The types of molecules observed in these experiments and the mechanisms leading to the aggregation of atoms in weakly bound molecules are very different from those encountered in warmer samples. In particular, we present results on molecules with binding energies of less than 0.05 J/mol and discuss their properties in the context of a new category of molecular states arising from slow-electron–atom scattering and their relation to atomic and molecular Rydberg states. One of the astonishing aspects of these types of molecules is that they can still be treated in good approximation in the realm of the Born-Oppenheimer approximation despite a huge electronic-state density. Non-Born-Oppenheimer effects are revealed by the decay of the molecules into neutral and charged fragments.

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“…The UV radiation driving the photoassociation transitions is obtained by frequencydoubling the output of a continuous-wave (cw) single-mode ring dye laser at ∼639 nm and forming pulses of 3 µs length using an acousto-optic modulator. The laser frequency is calibrated with the help of a wavemeter and a frequency comb [27]. The formation of Rydberg molecules is detected by applying pulsed electric potentials to a pair of electrodes surrounding the photoexcitation region, creating an electric field with sufficient magnitude to field ionize the Rydberg molecules.…”

Section: Photoassociation Of Butterfly-like Long-range Rydberg Moleculesmentioning

confidence: 99%

Formation of ultracold ion pairs through long-range Rydberg molecules

Peper

Deiglmayr²

2020

J. Phys. B: At. Mol. Opt. Phys.

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We propose a new approach to excite ion-pair states of ultracold dimers. The central idea is a two-step process where first long-range Rydberg molecules are formed by photoassociation, which are then driven by stimulated emission towards the ion-pair state, a process bearing features of a photo-induced harpooning reaction. We assess the feasibility of this approach through a detailed experimental and theoretical study on a specific system, p-wave-scattering dominated long-range Rydberg molecules in caesium, and discuss potential applications for the study of strongly correlated plasmas consisting of oppositely charged particles of equal or similar mass.

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Precision measurement of the ionization energy of Cs i

Cited by 55 publications

References 55 publications

Precision measurement of the ionization energy and quantum defects ofK39i

Precision measurement of the ionization energy and quantum defects ofK39i

Exotic Chemistry with Ultracold Rydberg Atoms

Formation of ultracold ion pairs through long-range Rydberg molecules

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