Experiments with an ion-neutral hybrid trap: cold charge-exchange collisions

Smith, William Hayden; Goodman, Douglas S.; Sivarajah, Ilamaran; Wells, James; Banerjee, Sandipan; Côté, Robin; Michels, H. H.; Mongtomery, J. A.; Narducci, Frank A.

doi:10.1007/s00340-013-5672-2

Cited by 49 publications

(65 citation statements)

References 38 publications

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“…Recently, a hybrid trap was developed that also incorporates an optical cavity [9]. Over the past decade, since the hybrid trap was originally proposed [10,11], both experimental [2,[4][5][6][7][8][9][12][13][14][15][16][17][18][19][20][21][22] and theoretical [23][24][25][26][27][28][29][30] interest in low-energy ion-neutral collisions has surged.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…1). The choice of the initial state is motivated by ongoing experiments [40], the fact that a magneto-optical trap (MOT) of Na atoms is readily available, and the analysis of dipole transitions given in the previous section.…”

Section: Photoassociation and Spontaneous Relaxationmentioning

confidence: 99%

“…[34]), making the proposed PA mechanism worth considering in suitable atom-ion mixtures. Finally, we note that triplet states were not included in the study since there is no experimental evidence for strong singlettriplet coupling of the considered electronic states [40]. While the main goal of this study was to investigate the PA, as an all-optical approach to formation of ultracold (NaCa) + molecular ions, as well as to provide higher quality electronic structure data to aid future experiments, the results obtained suggest that a similar approach could be extended to other mixtures composed of an alkali metal atom and an alkaline earth ion with qualitatively similar electronic structure.…”

Section: −1mentioning

confidence: 99%

“…Our approach is motivated by the fact that the PA is a highly successful and state-selective method of production of cold diatomic molecules from ultracold atomic gases [1,[46][47][48] native to RA or RCX in molecular ions with favorable electronic structure [35]. Our choice of the system was motivated by ongoing experiments [40], existing theoretical results [39], and the fact that similar electronic configuration of the outer shell is shared by other molecular ion species currently of interest [34].…”

Section: Introductionmentioning

confidence: 99%

“…The RA has been observed for Rb+Ca + [26,27] and Rb+Ba + [28], and both processes have been investigated for several molecular ion species, including H+(D + ,T + ) and D+T + [29], Rb+Na + [30,31] [36,37]. The experiments and theoretical studies with emphasis on radiative chargeexchange in atom-ion systems have been conducted for Na+Na + [20,38], Na+Ca + [39,40] [44], and others [34,45]. See Ref.…”

Section: Introductionmentioning

confidence: 99%

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Production ofNaCa+molecular ions in the ground state from cold atom-ion mixtures by photoassociation via an intermediate state

2016

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We present a theoretical analysis of optical pathways for formation of cold ground state (NaCa) + molecular ions via an intermediate state. The formation schemes are based on ab initio potential energy curves and transition dipole moments calculated using effective-core-potential methods of quantum chemistry. In the proposed approach, starting from a mixture of cold trapped Ca + ions immersed into an ultracold gas of Na atoms, (NaCa) + molecular ions are photoassociated in the excited E 1 Σ + electronic state and allowed to spontaneously decay either to the ground electronic state or an intermediate state from which the population is transferred to the ground state via an additional optical excitation. By analyzing all possible pathways, we find that the efficiency of a two-photon scheme, via either B 1 Σ + or C 1 Σ + potential, is sufficient to produce significant quantities of ground state (NaCa) + molecular ions. A single-step process results in lower formation rates that would require either a high density sample or a very intense photoassociation laser to be viable.

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Ultracold Hybrid Atom–Ion Systems

Côté

2016

Advances in Atomic, Molecular, and Optical Physics

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Experiments with an ion-neutral hybrid trap: cold charge-exchange collisions

Cited by 49 publications

References 38 publications

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

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

Production ofNaCa+molecular ions in the ground state from cold atom-ion mixtures by photoassociation via an intermediate state

Ultracold Hybrid Atom–Ion Systems

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