Production and storage of low-energy highly charged ions by laser ablation and an ion trap

Kwong, Victor H. S.

doi:10.1103/physreva.39.4451

Cited by 28 publications

(17 citation statements)

References 11 publications

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“…Elemental mass spectra have also been reported by others using RF quadrupole ion traps and elemental ion sources other than an ICP. [18][19][20][21][22][23][24] The ion/ molecule chemistry discussed in this work could also be used to advantage in Fourier transform ion cyclotron resonance instruments which incorporate various atomic ion sources. [25][26][27][28] For example, selective ion/ molecule chemistry could be used to shift the m/z ratio of an interferent species so that selective and efficient removal from the trap could be effected prior to mass analysis.…”

Section: 15mentioning

confidence: 98%

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Eiden

Barinaga

Koppenaal

1997

Rapid Commun. Mass Spectrom.

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A plasma source ion trap (PSIT) mass spectrometer has been modified to incorporate a radiofrequency octopole ion guide/collision cell between the ion source and the mass spectrometer. This modification allows ions sampled from the plasma to undergo reactions prior to mass spectrometric analysis. This capability can obviate the need for chemical or chromatographic separation of the sample, remove mass spectral intereferences and enable formation of analytically useful molecular ions. Distinct reaction chemistries can be utilized in the octopole and/or ion trap. Performance of the instrument is dramatically improved if hydrogen gas is introduced into the octopole; molecular hydrogen reacts with Ar + and certain other plasma ions, greatly reduces their intensities, and cools and focuses the ion beam prior to its injection into the ion trap.

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Section: 15mentioning

confidence: 98%

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Eiden

Barinaga

Koppenaal

1997

Rapid Commun. Mass Spectrom.

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“…We are especially interested in the production of Th + for an investigation of a nuclear optical clock based on the low energy transition to an isomeric state in 229 Th [7]. Previous studies have already reported laser ablation from metals for the loading of ion traps [5,[8][9][10][11][12][13], but typically higher laser pulse energies at infrared wavelengths were used and experiments were carried out only for a small selection of elements. Laser desorption of organic molecules has been studied in conjunction with ion trap mass spectrometry (see for example Refs.…”

Section: Introductionmentioning

confidence: 99%

Laser ablation loading of a radiofrequency ion trap

et al. 2012

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The production of ions via laser ablation for the loading of radiofrequency (RF) ion traps is investigated using a nitrogen laser with a maximum pulse energy of 0.17 mJ and a peak intensity of about 250 MW/cm 2 . A time-of-flight mass spectrometer is used to measure the ion yield and the distribution of the charge states. Singly charged ions of elements that are presently considered for the use in optical clocks or quantum logic applications could be produced from metallic samples at a rate of the order of magnitude 10 5 ions per pulse. A linear Paul trap was loaded with Th + ions produced by laser ablation. An overall ion production and trapping efficiency of 10 −7 to 10 −6 was attained. For ions injected individually, a dependence of the capture probability on the phase of the RF field has been predicted. In the experiment this was not observed, presumably because of collective effects within the ablation plume.

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“…Single 88 Sr + ions are loaded from an ablation plume produced by a Q-switched, frequency tripled Nd:YAG laser incident on a SrTiO 3 target [30,31]. The ion is Doppler cooled on the dipole-allowed S 1/2 ↔ P 1/2 , 422 nm transition to < 1 mK, followed by sideband cooling of the lowest frequency mode on the quadrupoleallowed S 1/2 ↔ D 5/2 , 674 nm transition [32,33].…”

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confidence: 99%

Suppression of Heating Rates in Cryogenic Surface-Electrode Ion Traps

et al. 2008

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Dense arrays of trapped ions provide one way of scaling up ion trap quantum information processing. However, miniaturization of ion traps is currently limited by sharply increasing motional state decoherence at sub-100 µm ion-electrode distances. We characterize heating rates in cryogenically cooled surface-electrode traps, with characteristic sizes in 75 µm to 150 µm range. Upon cooling to 6 K, the measured rates are suppressed by 7 orders of magnitude, two orders of magnitude below previously published data of similarly sized traps operated at room temperature. The observed noise depends strongly on fabrication process, which suggests further improvements are possible.PACS numbers: 32.80. Pj, 39.10.+j, 42.50.Vk Quantum information processing offers a tantalizing possibility of a significant speedup in execution of certain algorithms [1,2], as well as enabling previously unmanageable simulations of large quantum systems [3,4]. One of the most promising avenues towards practical quantum computation uses trapped ions as qubits. Interaction between qubits can be mediated by superconductive wires [5], photons [6,7] or by shared phonon modes [8]. The last scheme has been most successful so far, having demonstrated one and two qubit gates [9], teleportation [10,11], error correction[12] and shuttling [13]. Scaling of these experiments to a large number of ions will require arrays of small traps, on the order of 10 µm, to achieve dense qubit packing, improve the gate speed and reduce the time necessary to shuttle ions between different traps in the array [14,15,16,17]. Micro-fabrication techniques have been successfully used to fabricate a new generation of ion traps, demonstrating trap sizes down to 30 µm [18,19,20]. However, as the trap size is decreased, ion heating and decoherence of the motional quantum state increases rapidly, approximately as the fourth power of the trap size [21,22,23]. At currently observed values, the heating rate in a 10 µm trap would exceed 10 6 quanta/s, precluding ground-state cooling or qubit operations mediated by the motional state.The strong distance dependence of the heating rate suggests that the electric field noise is generated by surface charge fluctuations, which are small compared to the distance to the ion. Charge noise is also observed in condensed matter systems, where device fabrication has proven critical in reducing the problem [24,25]. Similar advances in ion traps are impeded by lack of data and models accurately predicting measured noise [26,27,28]. The charge fluctuations have been demonstrated to be thermally driven, providing another plausible route to reduce the heating. Cooling of the electrodes to 150 K has been shown to significantly decrease the heating rate [23].In this Letter, we present the first measurements of heating rates in ion traps cooled to 6 K. We designed and built a range of surface-electrode traps, in which we are able to cool a single ion to motional ground state with high fidelity and observe heating on a quantum level. Although the traps h...

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Production and storage of low-energy highly charged ions by laser ablation and an ion trap

Cited by 28 publications

References 11 publications

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Beneficial Ion/Molecule Reactions in Elemental Mass Spectrometry

Laser ablation loading of a radiofrequency ion trap

Suppression of Heating Rates in Cryogenic Surface-Electrode Ion Traps

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