Photoionization cross-sections of the first excited states of sodium and lithium in a magneto-optical trap

Wippel, Volker; Binder, Christopher; Huber, W.; Windholz, Laurentius; Allegrini, M.; Fuso, F.; Arimondo, E.

doi:10.1007/s100530170002

Cited by 39 publications

(39 citation statements)

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“…Apart from extraterrestrial applications, we believe our results will contribute to the widening use of vapor-cell technology for producing better controlled Na MOTs in the range of tens of millions of atoms [16,17]. Indeed, * chandra.raman@physics.gatech.edu a recent preprint reports a vapor-cell-based sodium Bose-Einstein condensate (BEC) by rapid evaporation in a dipole trap, demonstrating that Zeeman slower technology is not required [18].…”

Section: Introductionmentioning

confidence: 88%

Light-induced atomic desorption for loading a sodium magneto-optical trap

et al. 2010

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We report studies of photon-stimulated desorption, also known as light-induced atomic desorption, of sodium atoms from a vacuum-cell glass surface used for loading a magneto-optical trap (MOT). Fluorescence detection was used to record the trapped atom number and the desorption rate. We observed a steep wavelength dependence of the desorption process above 2.6 eV photon energy, a result significant for estimations of sodium vapor density in the lunar atmosphere. Our data fit well to a simple model for the loading of the MOT dependent only on the sodium desorption rate and residual gas density. Up to 3.7 × 10 7 Na atoms were confined under ultrahigh-vacuum conditions, creating promising loading conditions for a vapor-cell-based atomic Bose-Einstein condensate of sodium.

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Section: Introductionmentioning

confidence: 88%

Light-induced atomic desorption for loading a sodium magneto-optical trap

et al. 2010

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“…Our group's hybrid trap consists of a standard vapor-cell Na MOT [41][42][43] concentric within a segmented LPT [44,45] and held in a vacuum chamber at a pressure ~1 0 _1° Torr. The MOT is loaded with 346 ± 3 K Na vapor from a biased getter source within the vacuum chamber.…”

Section: Magneto-optical Trapmentioning

confidence: 99%

“…In the temperature-limited regime [43,67], the volume of the MOT VMot remains constant while the MOT density n MOT increases linearly with atom population Na. Collisions between two MOT atoms lead to a nonexponential two-body loss rate /)wMOT [68], while collisions with constant density background Na atoms result in a linear loss rate yb.…”

Section: A Na Mot Loading Measurementsmentioning

confidence: 99%

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Measurement of the low-energyNa+−Natotal collision rate in an ion-neutral hybrid trap

et al. 2015

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We present measurements of the total elastic and resonant charge-exchange ion-atom collision rate coefficient jtia of cold sodium (Na) with optically dark low-energy Na+ ions in a hybrid ion-neutral trap. To determine ka, we measured the trap loading and loss rates from both a Na magneto-optical trap (MOT) and a linear radio-frequency quadra pole Paul trap. We found the total rate coefficient to be 7.4 ± 1.9 x 10~8 cm3/s for the type-I Na MOT immersed within an «140-K ion cloud and 1.10 ± 0.25 x 10"7 cm3/s for the type-II Na MOT within an « 1070-K ion cloud. Our measurements show excellent agreement with previously reported theoretical fully quantal ah initio calculations. In the process of determining the total rate coefficient, we demonstrate that a MOT can be used to probe an optically dark ion cloud's spatial distribution within a hybrid trap.

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“…Kramer et al [11] reported the saturated three-step resonance ionization of ground state and measured the photoionization cross section from the excited n 3 manifold of lithium. Wippel et al [12] reported the photoionization cross sections of the first excited states of two isotopes of lithium at different ionizing laser wavelengths above the threshold using a magneto-optical trap. Subsequently, Amin et al [13] measured the photoionization cross sections for the 3s, 2p, and 3d excited states of lithium at various ionizing laser wavelengths above the first ionization threshold using saturation absorption technique.…”

Section: Introductionmentioning

confidence: 99%

Photoionization studies from the 3p P2 excited state of neutral lithium

et al. 2012

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In the present work, the experimentally determined oscillator strengths of the 3p 2 P → nd D 2 (16 ≤ n ≤ 43) Rydberg transitions of lithium have been reported for the first time. The experiments were performed using two dye lasers simultaneously pumped by the second harmonic (532 nm) of an Nd:YAG laser, and the vapor containment and detection system was a thermionic diode ion detector. The first frequency-doubled dye laser excites the groundstate atoms to the 3p 2 P excited state at 325.35 nm, and the second dye laser was scanned up to the first ionization threshold. The f -values of the aforementioned transitions have been determined using the threshold value of the photoionization cross section (30 4.8 Mb) from the 3p 2 P excited state. A complete picture of the oscillator strengths from n 3 to 43 has been presented, including the previously known oscillator strength and determined in this work.

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Photoionization cross-sections of the first excited states of sodium and lithium in a magneto-optical trap

Cited by 39 publications

References 0 publications

Light-induced atomic desorption for loading a sodium magneto-optical trap

Light-induced atomic desorption for loading a sodium magneto-optical trap

Measurement of the low-energyNa+−Natotal collision rate in an ion-neutral hybrid trap

Photoionization studies from the 3p P2 excited state of neutral lithium

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