Measurement of charge exchange between Na and 
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 in a hybrid trap

Kwolek, Jonathan; Goodman, Douglas S.; Slayton, Benjamin; Blümel, R.; Wells, James; Narducci, Frank A.; Smith, William Hayden

doi:10.1103/physreva.99.052703

Cited by 10 publications

(7 citation statements)

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“…The long range interaction between neutral atoms and ions 41 scales as 1/r 4 . The details of the long range potential and hence the charge exchange probabilities varies with the combination of atoms and ions [15][16][17][18] . We observe for the first time the charge exchange interaction between 39 K atoms FIG.…”

Section: Resultsmentioning

confidence: 99%

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A hybrid ion-atom trap with integrated high resolution mass spectrometer

Jyothi

Egodapitiya

Bondurant

et al. 2019

Review of Scientific Instruments

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In this article we describe the design, construction and implementation of our ion-atom hybrid system incorporating a high resolution time of flight mass spectrometer (TOFMS). Potassium atoms ( 39 K) in a Magneto Optical Trap (MOT) and laser cooled calcium ions ( 40 Ca + ) in a linear Paul trap are spatially overlapped and the combined trap is integrated with a TOFMS for radial extraction and detection of reaction products. We also present some experimental results showing interactions between 39 K + and 39 K, 40 Ca + and 39 K + as well as 40 Ca + and 39 K pairs. Finally, we discuss prospects for cooling CaH + molecular ions in the hybrid ion-atom system.

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Section: Resultsmentioning

confidence: 99%

“…In the past decade, hybrid traps were employed to study elastic and inelastic collisions as well as rich chemical interactions between cold atoms and ions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] . The very recent research in this field focuses on controlling the chemical reactions in cold ion-atom collisions.…”

Section: Introductionmentioning

confidence: 99%

A hybrid ion-atom trap with integrated high resolution mass spectrometer

Jyothi

Egodapitiya

Bondurant

et al. 2019

Review of Scientific Instruments

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“…In ion-atom mixtures, the ion is typically trapped in a radio-frequency Paul trap (Paul, 1990) (Mills et al, 2019;Li et al, 2019), 40 Ca + -28 Na (Kwolek et al, 2019), 40 Ca + -39 K (Li et al, 2020) and 55 Cs-55 Cs (Dutta and Rangwala, 2020) Table 1: Overview of experimental ion-atom mixtures with ultracold atoms and their characteristics. Given are the ion-atom mass ratio ξ, the C 4 -coefficient with definition V ia (r) = − C4 r 4 , the s-wave energy E s and the most up-to-date experimental reference.…”

Section: Ion-atom Mixturesmentioning

confidence: 99%

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Lous,

Gerritsma

2022

Preprint

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Experimental setups that study laser-cooled ions immersed in baths of ultracold atoms merge the two exciting and well-established fields of quantum gases and trapped ions. These experiments benefit both from the exquisite read-out and control of the few-body ion systems as well as the many-body aspects, tunable interactions, and ultracold temperatures of the atoms. However, combining the two leads to challenges both in the experimental design and the physics that can be studied. Nevertheless, these systems have provided insights into ion-atom collisions, buffer gas cooling of ions and quantum effects in the ion-atom interaction. This makes them promising candidates for ultracold quantum chemistry studies, creation of cold molecular ions for spectroscopy and precision measurements, and as test beds for quantum simulation of charged impurity physics. In this review we aim to provide an experimental account of recent progress and introduce the experimental setup and techniques that enabled the observation of quantum effects.

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“…More recently, experiments successfully merged ion and neutral atom trapping techniques. These experiments include the study of reaction dynamics of neutral atoms and atomic ions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], as well as of cold atoms and molecular ions [17][18][19]. Here, the long storage times of laser-cooled ion-atom systems has allowed the study of processes that are difficult to observe otherwise.…”

Section: Introductionmentioning

confidence: 99%

“…When one or both colliding partners, however, are prepared in excited electronic states more inelastic channels become available and richer dynamics occurs with corresponding challenges in the theoretical interpretation. Recently, such inelastic collisions have been reported for the ion in an excited state [4,12,15,[20][21][22], for an excited atom colliding with an ion or a charged molecule [15,[23][24][25][26], and for both in excited states [15].…”

Section: Introductionmentioning

confidence: 99%

Photon-mediated charge-exchange reactions between 39K atoms and 40Ca+ ions in a hybrid trap

Li,

Jyothi,

et al. 2020

Preprint

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We present experimental evidence of charge exchange between laser-cooled potassium 39 K atoms and calcium 40 Ca + ions in a hybrid atom-ion trap and give quantitative theoretical explanations for the observations. The 39 K atoms and 40 Ca + ions are held in a magneto-optical (MOT) and a linear Paul trap, respectively. Fluorescence detection and high resolution time of flight mass spectra for both species are used to determine the remaining number of 40 Ca + ions, the increasing number of 39 K + ions, and 39 K number density as functions of time. Simultaneous trap operation is guaranteed by alternating periods of MOT and 40 Ca + cooling lights, thus avoiding direct ionization of 39 K by the 40 Ca + cooling light. We show that the K-Ca + charge-exchange rate coefficient increases linearly from zero with 39 K number density and, surprisingly, the fraction of 40 Ca + ions in the 4p 2 P 1/2 electronically-excited state. Combined with our theoretical analysis, we conclude that these data can only be explained by a process that starts with a potassium atom in its electronic ground state and a calcium ion in its excited 4p 2 P 1/2 state producing ground-state 39 K + ions and metastable, neutral Ca (3d4p 3 P1) atoms, releasing only 150 cm −1 equivalent relative kinetic energy. Chargeexchange between either ground-or excited-state 39 K and ground-state 40 Ca + is negligibly small as no energetically-favorable product states are available. Our experimental and theoretical rate coefficients are in agreement given the uncertainty budgets.

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Measurement of charge exchange between Na and Ca+ in a hybrid trap

Cited by 10 publications

References 50 publications

A hybrid ion-atom trap with integrated high resolution mass spectrometer

A hybrid ion-atom trap with integrated high resolution mass spectrometer

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Photon-mediated charge-exchange reactions between 39K atoms and 40Ca+ ions in a hybrid trap

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