Photoionization cross sections of the 
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 states of Rb in simul

Witkowski, Marcin; Munoz-Rodriguez, Rodolfo; Raczyński, A.; Zaremba, J.; Nagórny, Bartłomiej; Żuchowski, Piotr S.; Ciuryło, R.; Zawada, M.

doi:10.1103/physreva.98.053444

Cited by 10 publications

(4 citation statements)

References 42 publications

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“…The photoionisation cross section 𝜎1 P 1 was determined by comparing the loading rates of the MOT fluorescence with and without the photoionising 389.889 nm light. This technique has proven very efficient in measuring absolute ionisation cross sections of trapped atoms [27,28].…”

Section: Photoionisation Of the 1 Pmentioning

confidence: 99%

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Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Witkowski,

Bilicki,

Bober

et al. 2022

Preprint

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We present the measurements of the photoionisation cross sections of the excited 1 P 1 and 3 S 1 states of ultracold 88 Sr atoms at 389.889 nm wavelength, which is the magic wavelength of the 1 S 0 -3 P 0 clock transition. The photoionisation cross section of the 1 P 1 state is determined from the measured ionisation rates of 88 Sr in the magneto-optical trap in the 1 P 1 state to be 2.20(50)×10 −20 m 2 , while the photoionisation cross section of 88 Sr in the 3 S 1 state is inferred from the photoionisation-induced reduction in the number of atoms transferred through the 3 S 1 state in an operating optical lattice clock to be 1.38(66)×10 −18 m 2 . Furthermore, the resulting limitations of employing a blue-detuned magic wavelength optical lattice in strontium optical lattice clocks are evaluated. We estimated photoionisation induced loss rates of atoms at 389.889 nm wavelength under typical experimental conditions and made several suggestions on how to mitigate these losses. In particular, the large photoionisation induced losses for the 3 S 1 state would make the use of the 3 S 1 state in the optical cycle in a blue-detuned optical lattice unfeasible and would instead require the less commonly used 3 D 1,2 states during the detection part of the optical clock cycle.

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Section: Photoionisation Of the 1 Pmentioning

confidence: 99%

“…The methods that calibrate population dependence on the MOT beams intensity, described e.g. in [28,31], are not used here since they require laser light intensities exceeding the saturation of the transition. Instead, the measured values of 𝐼 461 and Δ are directly used in Eq.…”

Section: Ionisation 390nmmentioning

confidence: 99%

Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Witkowski,

Bilicki,

Bober

et al. 2022

Preprint

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“…In this work, we propose the formation of ultracold heteronuclear molecules composed of a transition-metal zinc or cadmium atom interacting with an alkali-metal or alkalineearth-metal atom. The electronic structure of homonuclear dimers of group-IIB atoms, such as Zn 2 , Cd 2 , and Hg 2 , has been a subject of theoretical studies [44][45][46][47], while heteronuclear molecules composed of a Hg atom interacting with an alkali-metal atom have been investigated both theoretically [48,49] and experimentally [50][51][52]. To the best of our knowledge, molecules composed of a Zn or Cd atom interacting with an alkali-metal or alkaline-earth-metal atom have not yet been investigated in the literature.…”

Section: Introductionmentioning

confidence: 99%

Van der Waals molecules consisting of a zinc or cadmium atom interacting with an alkali-metal or alkaline-earth-metal atom

Zaremba-Kopczyk,

Tomza

2021

Preprint

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Alkaline-earth-like transition-metal atoms such as Zn and Cd are promising candidates for precision measurements and quantum many-body physics experiments. Here, we theoretically investigate the properties of diatomic molecules containing these closed-shell atoms. We calculate potential energy curves, permanent electric dipole moments, and spectroscopic constants for molecules consisting of either a Zn or Cd atom interacting with an alkali-metal (Li, Na, K, Rb, Cs, Fr) or alkaline-earth-metal (Be, Mg, Ca, Sr, Ba, Ra) atom. We use the ab initio electronic structure coupled cluster method with single, double, and triple excitations combined with large Gaussian basis sets and small-core relativistic energy-consistent pseudopotentials for heavier atoms. We predict that the studied molecules in the ground electronic state are chemically reactive weakly bound van der Waals complexes with small permanent electric dipole moments. The present results may be useful for spectroscopy and application of the studied molecules in modern ultracold physics and chemistry experiments.

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“…This approach is very sensitive and is capable of detecting extremely low ionization rates by analyzing trap losses caused by the presence of ionizing radiation. PI of trapped atoms is a significant source of losses in two-component MOTs, where the cooling beams of one species are responsible for the PI of the other [8]. In addition, PI must be taken into account in a UV MOT, where the laser which drives the resonance transition is responsible for the PI-induced trap losses [9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the photoionization cross section of lithium 2P_3/2 state in magneto-optical trap with UV light emitting diode

Saakyan¹,

Vilshanskaya²,

Galstyan³

et al. 2021

Meas. Sci. Technol.

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We report the measurement of the photoionization (PI) cross section of the lithium 2P 3/2 state in a magneto-optical trap (MOT) using a UV-light-emitting diode (LED). Losses from the lithium MOT induced by additional radiation ionizing the atoms in the 2P 3/2 state have been measured as a function of the intensity of the LED. The experiments have been conducted using a fiber-coupled LED with a flat-top output intensity distribution after the fiber. This makes it possible for us to reduce influences of spatial misalignment between the photoionizing radiation and the MOT density distribution. The PI cross section of lithium in the 2P 3/2 state at 345.5 nm is determined to be (20.1 ± 0.9) Mb. The applied technique allows us to determine the PI cross section with three times better accuracy in comparison with previous measurements. Our result is in good agreement with previously reported experimental results and it differs from the published theoretical data.

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Photoionization cross sections of the 5S1/2 and 5P3/2 states of Rb in simul

Cited by 10 publications

References 42 publications

Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Van der Waals molecules consisting of a zinc or cadmium atom interacting with an alkali-metal or alkaline-earth-metal atom

Measurement of the photoionization cross section of lithium 2P_3/2 state in magneto-optical trap with UV light emitting diode

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Photoionization cross sections of the 5S1/2 and 5P3/2 states of Rb in simul

Cited by 10 publications

References 42 publications

Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Photoionization cross sections of ultracold $^{88}$Sr in $^1$P$_1$ and $^3$S$_1$ states at 390 nm and the resulting blue-detuned magic wavelength optical lattice clock constraints

Van der Waals molecules consisting of a zinc or cadmium atom interacting with an alkali-metal or alkaline-earth-metal atom

Measurement of the photoionization cross section of lithium 2P3/2 state in magneto-optical trap with UV light emitting diode

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Measurement of the photoionization cross section of lithium 2P_3/2 state in magneto-optical trap with UV light emitting diode