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

Jyothi, S.; Egodapitiya, Kisra; Bondurant, Brad; Jia, Zhubing; Pretzsch, Eric; Chiappina, Piero; Shu, Gang; Brown, Kenneth R.

doi:10.1063/1.5121431

Cited by 15 publications

(11 citation statements)

References 49 publications

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“…Presented potential energy curves for the CaK + and CaCs + molecular ions may correspondingly find similar applications, e.g., in the context of experimental studies of a mixture of laser-cooled Ca + ions in a linear Paul trap overlapped with ultracold K atoms in a magneto-optical trap as presented recently in Ref. [28].…”

Section: A Potential Energy Curvesmentioning

confidence: 96%

“…Most of the cold ion-atom experiments use alkaline-earth-metal ions and alkali-metal or alkaline-earth-metal atoms because of their electronic structure favorable for laser cooling. Several cold atomic ion-atom combinations have already been experimentally investigated, including Yb + /Yb [20], Ca + /Rb [21], Ba + /Ca [22], Yb + /Ca [23], Yb + /Rb [5], Ca + /Li [24], Ca + /Rb [25], Ca + /Na [26], Sr + /Rb [27], Yb + /Li [12], Ca + /K [28], Ba + /Rb [29], and Rb + /Rb [6,30]. Ca + ions are the most common choice because advanced methods of their manipulation and detection have been developed for quantum simulation and computation applications [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, Ca + /Li ion-atom combination is one of the most promising systems for reaching the quantum regime of ion-atom collisions [8] due to the favorable mass ration reducing the impact of micromotion-induced heating in hybrid traps [51]. Recently, a new apparatus with a mixture of laser-cooled Ca + ions in a linear Paul trap overlapped with ultracold K atoms in a magneto-optical trap was presented [28]. This setup incorporates a high-resolution time-of-flight mass spectrometer designed for radial extraction and detection of reaction products opening the way for detailed studies of the state-selected formation of CaK + molecular ions.…”

Section: Introductionmentioning

confidence: 99%

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Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

et al. 2020

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Experiments with cold ion–atom mixtures have recently opened the way for the production and application of ultracold molecular ions. Here, in a comparative study, we theoretically investigate ground and several excited electronic states and prospects for the formation of molecular ions composed of a calcium ion and an alkali-metal atom: CaAlk+ (Alk = Li, Na, K, Rb, Cs). We use a quantum chemistry approach based on non-empirical pseudopotentials, operatorial core-valence correlation, large Gaussian basis sets, and full configuration interaction method for valence electrons. Adiabatic potential energy curves, spectroscopic constants, and transition and permanent electric dipole moments are determined and analyzed for the ground and excited electronic states. We examine the prospects for ion-neutral reactive processes and the production of molecular ions via spontaneous radiative association and laser-induced photoassociation. After that, spontaneous and stimulated blackbody radiation transition rates are calculated and used to obtain radiative lifetimes of vibrational states of the ground and first-excited electronic states. The present results pave the way for the formation and spectroscopy of calcium–alkali-metal-atom molecular ions in modern experiments with cold ion–atom mixtures.

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Section: A Potential Energy Curvesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

et al. 2020

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“…The experiments are performed in a spatially overlapped ion-atom hybrid trap comprised of a magneto optical trap (MOT) for neutral 39 K atoms and a linear Paul trap for 40 Ca + ions [32]. A schematic of the experimental setup is shown in Fig.…”

Section: Experimental Setup and Observationsmentioning

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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“…The ARTIQ experiment control system [1], initiated by the NIST Ion Storage Group, is a popular choice for many other researchers working with trapped ions [2][3][4] [5][6] [7] [8], but also ultracold atoms [9][10], diamond NV centers [11], and hybrid systems [12] [13]. One of its key features is the ARTIQ-Python language, a subset of the popular Python programming language which has been extended to provide real-time I/O features.…”

Section: Introductionmentioning

confidence: 99%

Combining processing throughput, low latency and timing accuracy in experiment control

Lam¹,

Maka²,

Nadlinger³

et al. 2021

Preprint

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We ported the firmware of the ARTIQ ® experiment control infrastructure to an embedded system based on a commercial Xilinx ® Zynq ® -7000 system-on-chip. It contains high-performance hardwired CPU cores integrated with FPGA fabric. As with previous ARTIQ systems, the FPGA fabric is responsible for timing all I/O signals to and from peripherals, thereby retaining the exquisite precision required by most quantum physics experiments. A significant amount of latency is incurred by the hardwired interface between the CPU core and FPGA fabric of the Zynq-7000 chip; creative use of the CPU's cache-coherent accelerator ports and the CPU's event flag allowed us to reduce this latency and achieve better I/O performance than previous ARTIQ systems. The performance of the hardwired CPU core, in particular when floating-point computation is involved, greatly exceeds that of previous ARTIQ systems based on a softcore CPU. This makes it interesting to execute intensive computations on the embedded system, with a low-latency path to the experiment. We extended the ARTIQ compiler so that many mathematical functions and matrix operations can be programmed by the user, using the familiar NumPy syntax.

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

Cited by 15 publications

References 49 publications

Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

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

Combining processing throughput, low latency and timing accuracy in experiment control

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