Hyperfine-resolved optical spectroscopy of the A2Π ← X2Σ+ transition in MgF

Doppelbauer, Maximilian; Wright, S. C.; Hofsäss, Simon; Sartakov, Boris G.; Meijer, Gerard; Truppe, Stefan

doi:10.1063/5.0081902

Cited by 15 publications

(7 citation statements)

References 54 publications

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“…Compared to Cr [36] or sintered SrF 2 [39] precursor targets, the yield from sintered MgF 2 precursor targets decays rapidly, dropping by roughly half after typically 100 ablation pulses. This has motivated us to begin construction of a CBGB based on the chemical reaction between the Mg metal and a fluorinated gas [22,40], which should stably produce high yields.…”

Section: Methodsmentioning

confidence: 99%

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Radiative decay rate and branching fractions of MgF

Norrgard,

Chamorro,

Cooksey

et al. 2023

Phys. Rev. A

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We report measured and calculated values of radiative decay rates and vibrational branching fractions for the A 2 (v = 0) state of 24 Mg 19 F. The decay rate measurements use time-correlated single-photon counting with roughly 1% total uncertainty. Branching-fraction measurements are performed using two calibrated imaging systems to achieve few percent total uncertainty. We use the multireference relativistic ab initio methods to calculate the Franck-Condon factors and transition dipole moments required to determine the decay rates and the branching fractions. The measurements provide a precision benchmark for testing the accuracy of the molecular structure calculations. The determination of the decay rate and vibrational branching fractions can be used to inform future optical cycling and laser cooling schemes for the MgF molecule.

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Section: Methodsmentioning

confidence: 99%

“…An upper limit on the spontaneous decay rate of the MgF A 2 1/2 state was recently reported with approximately 4% fractional uncertainty in Ref. [22]. There, was determined by measuring laser-induced fluorescence as a function of laser frequency and extrapolating the fitted Lorenzatian linewidth to zero power.…”

Section: Introductionmentioning

confidence: 95%

Radiative decay rate and branching fractions of MgF

Norrgard,

Chamorro,

Cooksey

et al. 2023

Phys. Rev. A

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“…Its level diagram is illustrated in figure 9(a). MgF has received much interest recently as a good candidate for molecular cooling and trapping [83][84][85][86], largely because its light mass, large scattering rate (Γ XA /2π = 22 MHz), and high wavenumber/short wavelength of the cycling transition (λ XA = 359 nm) all enable large deceleration. For example, a max ∝ ℏk XA Γ/m is 15x higher for MgF than SrF.…”

Section: Mgfmentioning

confidence: 99%

Toward improved loading, cooling, and trapping of molecules in magneto-optical traps

Langin

DeMille

2023

New J. Phys.

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Recent experiments have demonstrated direct cooling and trapping of diatomic and triatomic molecules in magneto-optical traps (MOTs). However, even the best molecular MOTs to date still have density 10-5 times smaller than in typical atomic MOTs. The main limiting factors are: (i) inefficiencies in slowing molecules to velocities low enough to be captured by the MOT, (ii) low MOT capture velocities, and (iii) limits on density within the MOT resulting from sub-Doppler heating [J. A. Devlin and M. R. Tarbutt, Phys. Rev. A 90, 063415 (2018)]. All of these are consequences of the need to drive `Type-II' optical cycling transitions, where dark states appear in Zeeman sublevels, in order to avoid rotational branching. We present simulations demonstrating ways to mitigate each of these limitations. This should pave the way towards loading molecules into conservative traps with sufficiently high density and number to evaporatively cool them to quantum degeneracy.

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“…Slow beam velocities in the laboratory frame and a wide applicable temperature range are important characteristics of buffer gas cooling. Currently, numerous spectroscopic studies using buffer gas cooling have been reported. − …”

Section: Introductionmentioning

confidence: 99%

Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

et al. 2023

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In this study, we report the Doppler-free spectra of buffer-gas-cooled CaOH. We observed five Doppler-free spectra containing low-J Q 1 and R 12 transitions, which were only partially resolved by previous Doppler-limited spectroscopies. The spectra frequencies were corrected using the Doppler-free spectra of iodine molecules; accordingly, the uncertainty was estimated to be below 10 MHz. We determined the spin−rotation constant in the ground state, which agrees with the values reported in the literature obtained based on millimeter-wave data within 1 MHz. This suggests that the relative uncertainty is much smaller. The present study demonstrates the Doppler-free spectroscopy of a polyatomic radical and the broad applicability of the buffer gas cooling method to molecular spectroscopy. CaOH is the only polyatomic molecule that can be directly laser-cooled and trapped in a magneto-optical trap. High-resolution spectroscopy of such molecules is useful for establishing efficient laser cooling schemes of polyatomic molecules.

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Hyperfine-resolved optical spectroscopy of the A2Π ← X2Σ+ transition in MgF

Cited by 15 publications

References 54 publications

Radiative decay rate and branching fractions of MgF

Radiative decay rate and branching fractions of MgF

Toward improved loading, cooling, and trapping of molecules in magneto-optical traps

Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

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