High resolution laser excitation spectra and Franck-Condon factors of <i>A</i>2Π−<i>X</i>2Σ+ electronic transition of MgF

Gu, Jie; Xiao, Zengjun; Yu, Chunting; Zhang, Qiang; Chen, Yang; Zhao, Dongfeng

doi:10.1063/1674-0068/cjcp2109151

Cited by 8 publications

(5 citation statements)

References 41 publications

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“…‡ T e values originally reported in Ref. [35] were equated with the band origins, and are thus corrected here using the other reported spectroscopic constants for the sake of consistency with the values in this work and Ref. [34].…”

Section: B Resultsmentioning

confidence: 99%

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: B Resultsmentioning

confidence: 99%

Radiative decay rate and branching fractions of MgF

Norrgard,

Chamorro,

Cooksey

et al. 2023

Phys. Rev. A

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“…The hyperfine structure of the A 2 Π 1/2 state is unresolved. Electronically excited states have small (for molecules in this paper, ∼1% [40][41][42][43][44]) likelihood to undergo a vibrationally off-diagonal decay to |X 2 Σ, N = 1, v = 1⟩ (whose hyperfine structure, which is very similar to that of |X 2 Σ, N = 1, v = 0⟩, is not shown). Molecules decaying to this vibrationally excited state can be repumped via laser excitation to slowed [39].…”

Section: Overview: Laser Slowing Cooling and Trapping Of 2 σ Moleculesmentioning

confidence: 89%

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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“…[21] includes an analysis of the data of Ref. [7] which results in higher values for the excitation energies than the original data of Barrow and Beale [1] by about 17cm −1 . Such a difference exceeds the accuracy of the original experimental analysis, and can be related to the use of the effective Hamiltonian involved in the analysis of the data.…”

Section: Mg(xmentioning

confidence: 99%

“…[1]; for the A 2 ∏ excited state the number marked with † is based on the measurement of Ref. [7] as re-analyzed and reported in Ref. [21].…”

Section: Mg(xmentioning

confidence: 99%

“…The interest in laser cooling of MgF has resulted in a detailed study of potential energy curves and spectroscopic constants at the level of multi-reference configuration interaction (MRCI) [5,6]. These results can serve the present study as a theoretical benchmark, in addition to the experimental results [7]. The ground-state potential energy curve can be determined also from infrared spectroscopy [8] which leads to an extended Morse oscillator description of this curve.…”

Section: Introductionmentioning

confidence: 96%

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Calculation of Low-Lying Electronic Excitations of Magnesium Monofluoride: How Well Do Coupled-Cluster Methods Work?

Horbatsch

2024

Preprint

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Magnesium monofluoride is a polar molecule amenable to laser cooling which has caused renewed interest in its spectroscopy. In this work we consider the case of three low-lying electronic excitations, namely $\rm X \, {}^{2}\Sigma \to A \, {}^{2}\Pi, \ \to B \, {}^{2}\Sigma, \ \to C \,{}^{2}\Sigma$, using well developed quantum chemistry approaches, i.e., without reference to the spin-orbit splitting of the $\rm A \, {}^{2}\Pi$ states. Accurate experimental data for these transitions have been available for over 50 years. Here we explore the linear response method at the level of CC2 theory, as well as equation of motion methods at the level of CCSD and CC3, using two families of basis sets. Excellent agreement is obtained for the first three transitions when using the correlation-consistent basis sets and extrapolation to the complete basis limit within EOM-CC3 (at a relative precision of $10^{-4}$), and qualitative agreement for the other two methods. The purpose of this paper is to serve as a guide in how to approach the accurate calculation of excitations in polar diatomic molecules.

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High resolution laser excitation spectra and Franck-Condon factors of A2Π−X2Σ+ electronic transition of MgF

Cited by 8 publications

References 41 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

Calculation of Low-Lying Electronic Excitations of Magnesium Monofluoride: How Well Do Coupled-Cluster Methods Work?

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