Production of a rovibrationally selected O2+beam for dissociative recombination studies

Dochain, Arnaud; Urbain, Xavier

doi:10.1051/epjconf/20158405001

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…Measurement of the X 2 Π v = 0 − v ′ transition frequencies is much easier than that for the X 2 Πv = 21 → a 4 Π v = 0 or X 2 Πv = 22 → a 4 Πv = 1 transition frequencies because (1) the preparation of 16 O 2 + molecular ions in the X 2 Πv = 0, J = 1/2 state is much easier than that in the highly excited state [24], (2) frequency stabilization of the probe laser in the infrared or optical region is much easier than that for a THz wave to induce the transition between accidentally degenerated states, and (3) the vibrational transition rate is much higher than that of the X 2 Π − a 4 Π transition.…”

Section: Discussionmentioning

confidence: 99%

“…Another method is to use 15 N 2 + , whose natural abundance is on the order of 1 ppm. The 16 O nuclear spin is zero; therefore, the preparation of 16 O 2 + molecular ions in X 2 Π 1/2 (v, J) = (0, 1/2) by REMPI is possible using a simple laser system and natural O 2 gas [24]. Therefore, measurement using 16 O 2 + molecular ion is possible with a simpler apparatus than that with N 2 + .…”

Section: Comparison With Other Homonuclear Diatomic Molecular Ionsmentioning

confidence: 99%

“…Measurement of the X 2 Π 1/2 (v, J) = (0, 1/2)−(v ′ , 1/2) (v ≥ 1) transition frequencies can be performed with simpler experimental apparatus than that used for the measurement of the transition frequencies proposed by Hanneke et al [23]. The production of 16 O 2 + molecular ions in the desired vibrational rotational state with v ≤ 1 has already been realized by REMPI [24], but it is more difficult to prepare molecular ions in the highly excited state. The v = 0 − v ′ transition is probed with a laser in the infrared or optical region, whose frequency stabilization is much easier than that for a THz wave to detect the transitions between accidentally degenerated states.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy estimation of the O216+ transition frequencies targeting the search for the variation in the proton-electron mass ratio

Kajita¹

2017

Phys. Rev. A

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In this paper, we estimate the Stark and Zeeman shifts in the transition frequencies of the 16 O2 + molecular ion, as a step for the search for the variation in the proton-to-electron mass ratio µ. The X 2 Π v = 21 − a 4 Π v = 0 or the X 2 Πv = 21 − a 4 Π v = 1 transition frequencies (THz region) of the 16 O2 + molecular ion have particularly high sensitivity to the variation in µ. Note also that the Stark shift in the 16 O2 + transition frequencies is expected to be much smaller than that for heteronuclear diatomic molecules. However, the actual systematic uncertainties for the 16 O2 + transition frequencies have never been estimated. We estimated the Stark and Zeeman shifts in the different 16 O2 + transition frequencies. When the molecular ions in a string crystal formed in a linear trap (trap electric field < 0.1 V/cm, and Stark shift < 10 -20 ) are used, the X 2 Π 1/2 (v, J) = (0, 1/2) − (v ′ , 1/2)(v ′ ≥ 1) transition frequencies are most advantageous for the search for the variation in µ ∆µ/µ < 10 −17 because the Zeeman shift is easily suppressed to lower than 10 -18 and the electric quadrupole shift is zero. On the other hand, the X 2 Π 1/2 (v, J) = (21, 1/2) − a 4 Π 1/2 (v, J) = (0, 1/2) transition frequency has another merit that the positive Stark shift induced by the trap electric field can be canceled by the quadratic Doppler shift. Therefore, the measurement using molecular ions in a Coulomb crystal broadened in the radial direction is also possible, when the Zeeman shift is effectively eliminated. PACS numbers: 32.60.+i, 06.20.Dk, 33.20Ea

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Section: Discussionmentioning

confidence: 99%

Section: Comparison With Other Homonuclear Diatomic Molecular Ionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accuracy estimation of the O216+ transition frequencies targeting the search for the variation in the proton-electron mass ratio

Kajita¹

2017

Phys. Rev. A

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“…In particular, Rydberg excited states can have very high Franck-Condon overlap with the ionic ground state [56]. In O + 2 , such resonance-enhanced multi-photon ionization (REMPI) schemes have achieved near perfect vibrational selectivity [57][58][59][60][61]. With a single laser, one can excite a single rotational level in the neutral's Rydberg state, but the ion's rotational distributions will be governed by angular momentum propensities for the 66 Figure 2.…”

Section: Much Of the Data About The O +mentioning

confidence: 99%

Two-Photon Vibrational Transitions in O2+ as Probes of Variation of the Proton-to-Electron Mass Ratio

Carollo¹,

Frenett²,

Hanneke³

2018

Preprint

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Vibrational overtones in deeply bound molecules are sensitive probes for variation of the proton-to-electron mass ratio μ. In nonpolar molecules, these overtones may be driven as two-photon transitions. Here, we present procedures for experiments with O2+, including state-preparation through photoionization, a two-photon probe, and detection. We calculate transition dipole moments between all X2Пg vibrational levels and those of the A2Пu excited electronic state. Using these dipole moments, we calculate two-photon transition rates and AC-Stark-shift systematics for the overtones. We estimate other systematic effects and statistical precision. Two-photon vibrational transitions in O2+ provide multiple routes to improved searches for μ variation.

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“…Straightforward techniques exist for producing and analyzing the states of O + 2 . Rovibrationally selected O + 2 molecules have been produced in the X 2 Π g state with v = 0, 1, and J up to 51 2 [43]. The production is via resonance-enhanced multiphoton ionization (REMPI) with the selection coming from use of the d 1 Π g Rydberg state in neutral O 2 [44].…”

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confidence: 99%

High sensitivity to mass-ratio variation in deep molecular potentials

Hanneke,

Carollo,

Lane

2016

Preprint

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Molecular vibrational transitions are prime candidates for model-independent searches for variation of the proton-to-electron mass ratio. Searches for present-day variation achieve highest sensitivity with deep molecular potentials. We identify several high-sensitivity transitions in the deeply bound O + 2 molecular ion. These transitions are electric-dipole forbidden and thus have narrow linewidths. The most sensitive transitions take advantage of an accidental degeneracy between vibrational states in different electronic potentials. We suggest experimentally feasible routes to a measurement with uncertainty exceeding current limits on present-day variation in mp/me.

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Production of a rovibrationally selected O₂⁺beam for dissociative recombination studies

Cited by 10 publications

References 12 publications

Accuracy estimation of the O216+ transition frequencies targeting the search for the variation in the proton-electron mass ratio

Accuracy estimation of the O216+ transition frequencies targeting the search for the variation in the proton-electron mass ratio

Two-Photon Vibrational Transitions in O<sub>2</sub><sup>+</sup> as Probes of Variation of the Proton-to-Electron Mass Ratio

High sensitivity to mass-ratio variation in deep molecular potentials

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