Observation of a rotational transition of trapped and sympathetically cooled molecular ions

Shen, Jie; Borodin, A. M.; Hansen, M.; Schiller, S.

doi:10.1103/physreva.85.032519

Cited by 29 publications

(26 citation statements)

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“…The field of cold molecules has caught increasing attention during the last decades, as it creates new opportunties for studies of the dipole moment of the electron [1,2] or possible change of the fine-structure constant [3][4][5]. It also made it possible to perform new precision spectroscopy experiments [6][7][8][9][10][11], and study collision [12][13][14] and reaction dynamics [15][16][17][18][19][20][21] of molecules at low temperatures. Optical pumping and sympathetic and buffer gas cooling are the most common approaches to create cold molecules, spanning a temperature range from the ultracold regime to several kelvin.…”

Section: Introductionmentioning

confidence: 99%

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

et al. 2015

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We have studied the three-body complex formation rate of the hydroxyl anion with molecular hydrogen at low temperatures. The formed cluster is found to quickly undergo internal proton transfer to a hydrogen anion-water complex. This is probed by photodetachment spectroscopy, which clearly distinguishes the two isomeric structures. The product cluster is the only isomer found to be stably formed at the temperature and densities employed in the experiment. The cluster then binds an additional hydrogen molecule by a second three-body collision, which appears at a rate comparable to the first formation process. This is followed by a rapid growth to larger clusters.

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Section: Introductionmentioning

confidence: 99%

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

et al. 2015

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“…Recent experimental demonstrations with trapped heteronuclear diatomic molecular ions include MgH + [9,12], CaH + /CaD + [13], HD + [14], AlH + [15], HfF + [16], SrCl + [17], and BaCl + [18]. Given the difficulty of detecting scattered photons from dilute molecular-ion samples, rotational-state-selective PD has emerged as a critical tool for molecular ion spectroscopy [15,19] and precision measurements [16,20] theory [13,17,18].…”

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confidence: 99%

Reversing hydride-ion formation in quantum-information experiments withBe+

et al. 2015

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We demonstrate photodissociation of BeH + ions within a Coulomb crystal of thousands of 9 Be + ions confined in a Penning trap. Because BeH + ions are created via exothermic reactions between trapped, laser-cooled Be + ( 2 P 3/2 ) and background H2 within the vacuum chamber, they represent a major contaminant species responsible for infidelities in large-scale trapped-ion quantum information experiments. The rotational-state-insensitive dissociation scheme described here makes use of 157 nm photons to produce Be + and H as products, thereby restoring Be + ions without the need for reloading. This technique facilitates longer experiment runtimes at a given background H2 pressure, and may be adapted for removal of MgH + and AlH + impurities.PACS numbers: 52.27. Jt, 33.80.Gj, 34.50.Lf, Crystals of laser-cooled atomic ions form the basis of many experimental realizations of quantum logic gates [1][2][3] and simulations of quantum many-body physics [4][5][6]. In room-temperature vacuum systems, collisions with neutral background gas molecules limit quantum coherences and quantum logic operations [7]. Here we focus on inelastic (i.e. reactive) collisions where exothermic chemical reactions with background gas molecules can generate, in both Penning and rf traps, co-trapped molecular ions over a wide range of trapping conditions and crystal geometries [6][7][8][9]. These contaminants alter ion-crystal eigenfrequencies and can complicate quantum logic interactions [10]. Impurities may be resonantly ejected from both radiofrequency and Penning traps, but this technique is least efficient when the impurities are similar in mass to the qubit ion [11]. The rate of impurity ion formation increases linearly with the number of ion qubits in the register, and the time required for loading new ions and recalibrating the register increases with the size of the system. Therefore, experimental techniques to prevent or reverse qubit-ion chemistry will be a key tool for many-ion quantum information platforms. [18]. Given the difficulty of detecting scattered photons from dilute molecular-ion samples, rotational-state-selective PD has emerged as a critical tool for molecular ion spectroscopy [15,19] and precision measurements [16,20], while rotationally-insensitive dissociation schemes provide valuable tests of molecular * Electronic address: brian.sawyer@boulder.nist.gov ) after 9000 pulses of 157 nm photodissociation light at 1.6 mJ/pulse. We measure an increase in the Be + fraction from 81% to 97% of the constant total ion number in the crystal. Each image is 1.2 mm × 1.2 mm.

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“…To this end, results are presented as "effective" potentials [25,26], which then utilized for calculating of corrections as shown in [24]. Eventually, the theoretical frequencies for particular transitions are compared with precision spectroscopic measurements [27][28][29][30]. So far such experiments have been performed with HD + molecular ion only, but even more precise experiments in H + 2 are coming [31].…”

Section: A Relativistic and Radiative Correctionsmentioning

confidence: 99%

Ro-vibrational states of H⁺₂. Variational calculations

Korobov

2017

Molecular Physics

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The nonrelativistic variational calculation of a complete set of ro-vibrational states in the H + 2 molecular ion supported by the ground 1sσ adiabatic potential is presented. It includes both bound states and resonances located above the n = 1 threshold. In the latter case we also evaluate a predissociation width of a state wherever it is significant. Relativistic and radiative corrections are discussed and effective adiabatic potentials of these corrections are included as supplementary files.

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Observation of a rotational transition of trapped and sympathetically cooled molecular ions

Cited by 29 publications

References 29 publications

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Reversing hydride-ion formation in quantum-information experiments withBe+

Ro-vibrational states of H⁺₂. Variational calculations

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Observation of a rotational transition of trapped and sympathetically cooled molecular ions

Cited by 29 publications

References 29 publications

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Reversing hydride-ion formation in quantum-information experiments withBe+

Ro-vibrational states of H+2. Variational calculations

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Ro-vibrational states of H⁺₂. Variational calculations