BaH molecular spectroscopy with relevance to laser cooling

Tarallo, M.; Iwata, Geoffrey Z.; Zelevinsky, Tanya

doi:10.1103/physreva.93.032509

Cited by 46 publications

(30 citation statements)

References 44 publications

(76 reference statements)

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“…Oddly, applying this correction reduced the agreement with the measured lifetime [18] of the B 2 Σ + state, although the difference was < 1.5%. Also disappointingly, the agreement with the B 2 Σ + 1/2 − X 2 Σ + 1/2 branching-ratio measurement [3] became significantly worse.…”

Section: Introductionmentioning

confidence: 97%

“…We find that the branching ratios sensitively depend on the difference between the excited-and ground-state equilibrium bond lengths. An example of a molecule with this property is barium monohydride, BaH, a radical of interest for direct laser cooling [2][3][4]. For BaH, a 1-pm (0.5%) relative bond-length displacement can have a 25% effect on the branching ratios but only a 1% effect on the natural lifetimes.…”

Section: Introductionmentioning

confidence: 99%

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Assignment of excited-state bond lengths using branching-ratio measurements: The B 2Σ+ state of BaH molecules

Moore

Lane²,

McNally

et al. 2019

Phys. Rev. A

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Vibrational branching ratios in the B 2 Σ + -X 2 Σ + and A 2 Π -X 2 Σ + optical-cycling transitions of BaH molecules are investigated using measurements and ab initio calculations. The experimental values are determined using fluorescence and absorption detection. The observed branching ratios have a very sensitive dependence on the difference in the equilibrium bond length between the excited and ground state, ∆re: a 1 pm (.5%) displacement can have a 25% effect on the branching ratios but only a 1% effect on the lifetime. The measurements are combined with theoretical calculations to reveal a preference for a particular set of published spectroscopic values for the B 2 Σ + state (∆r B−X e = +5.733 pm), while a larger bond-length difference (∆r B−X e = 6.3 − 6.7 pm) would match the branching-ratio data even better. By contrast, the observed branching ratio for the A 2 Π 3/2 -X 2 Σ + transition is in excellent agreement with both the ab initio result and the spectroscopically measured bond lengths. This shows that care must be taken when estimating branching ratios for molecular laser cooling candidates, as small errors in bond-length measurements can have outsize effects on the suitability for laser cooling. Additionally, our calculations agree more closely with experimental values of the B 2 Σ + state lifetime and spin-rotation constant, and revise the predicted lifetime of the H 2 ∆ state to 9.5 µs. II. SPECTROSCOPY BACKGROUNDThe optical and near-infrared spectra of BaH [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] are dominated by the three 5d-complex states that correlate to the 5d state of the Ba atom: B 2 Σ + , A 2 Π, and H 2 ∆. Since all three reach below the ground-state dissociation threshold, the only decay mechanisms are radiative. In addition, these three low-lying excited states possess spectroscopic parameters that closely resemble the X 2 Σ + ground state. The resulting diagonal Franck-Condon (FC) factors ensure absorption-emission cycles arXiv:1904.07326v2 [physics.atom-ph]

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Assignment of excited-state bond lengths using branching-ratio measurements: The B 2Σ+ state of BaH molecules

Moore

Lane²,

McNally

et al. 2019

Phys. Rev. A

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“…Recently highly-efficient cooling and magneto-optical trapping of diatomic molecules was demonstrated for SrF [2], YO [3] and CaF [4,5]. The experiments on Doppler/Sisyphus cooling on BaH [6], MgF [7] and some other molecules and their cations are currently conducted by different groups. Recently we have proposed a number of polyatomic molecules containing light atoms, which may be expected to be suitable for Doppler/Sisyphus cooling [8].…”

Section: Introductionmentioning

confidence: 99%

Laser-coolable polyatomic molecules with heavy nuclei

Isaev

Zaitsevskii

Eliav

2017

J. Phys. B: At. Mol. Opt. Phys.

102

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Recently a number of diatomic and polyatomics molecules has been identified as a prospective systems for Doppler/Sisyphus cooling. Doppler/Sisyphus cooling allows to decrease the kinetic energy of molecules down to microkelvin temperatures with high efficiency and then capture them to molecular traps, including magneto-optical trap. Trapped molecules can be used for creation of molecular fountains and/or performing controlled chemical reactions, high-precision spectra measurements and a multitude of other applications. Polyatomic molecules with heavy nuclei present considerable interest for the search for "new physics" outside of Standard Model and other applications including cold chemistry, photochemistry, quantum informatics etc. Herein we would like to attract attention to radium monohydroxide molecule (RaOH) which is on the one hand an amenable object for laser cooling and on the other hand provides extensive possibilities for searching for P-odd and P, T -odd effects. At the moment RaOH is the heaviest polyatomic molecule proposed for direct cooling with lasers.

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“…The target holder can screw in and out of the cell wall to facilitate quick and minimally invasive ablation target changes. Pulsed ablation of a typical target [21] yields approximately 1000 shots, after which the signal begins to deteriorate but can be recovered by manually moving to a different spot on the same target. The solid targets are produced by cleaving commercial BaH 2 rocks 1-3 mm across (Materion DP-532-12-1) to expose a smooth surface, and gluing 4-6 of them to the holder with enough superglue (Loctite 414) to wick up the sides of the rocks.…”

Section: Experimental Apparatusmentioning

confidence: 99%

High-resolution optical spectroscopy with a buffer-gas-cooled beam of BaH molecules

2017

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Barium monohydride (BaH) is an attractive candidate for extending laser cooling and trapping techniques to diatomic hydrides. The apparatus and high-resolution optical spectroscopy presented here demonstrate progress toward this goal. A cryogenic buffer-gas-cooled molecular beam of BaH was constructed and characterized. Pulsed laser ablation into cryogenic helium buffer gas delivers ∼ 1 × 10 10 molecules/sr/pulse in the X 2 Σ + (v = 0, N = 1) state of primary interest. More than 1×10 7 of these molecules per pulse enter the downstream science region with forward velocities below 100 m/s and transverse temperature of 0.1 K. This molecular beam enabled high-resolution optical spectra of BaH in quantum states relevant to laser slowing and cooling. The reported measurements include hyperfine structure and magnetic g-factors in the X 2 Σ + , B 2 Σ + , and A 2 Π 1/2 states.

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BaH molecular spectroscopy with relevance to laser cooling

Cited by 46 publications

References 44 publications

Assignment of excited-state bond lengths using branching-ratio measurements: The B 2Σ+ state of BaH molecules

Assignment of excited-state bond lengths using branching-ratio measurements: The B 2Σ+ state of BaH molecules

Laser-coolable polyatomic molecules with heavy nuclei

High-resolution optical spectroscopy with a buffer-gas-cooled beam of BaH molecules

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