Buffer-gas cooling, high-resolution spectroscopy, and optical cycling of barium monofluoride molecules

Albrecht, Ralf; Scharwaechter, Michael; Sixt, Tobias; Hofer, L. R.; Langen, Tim

doi:10.1103/physreva.101.013413

Cited by 55 publications

(42 citation statements)

References 68 publications

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“…[6] together with the corresponding energy splittings and residuals obtained from fitting Eq. ( 11) and (12) b Reference [6] The basic idea of the theoretical uncertainty estimate is to account for all effects which are neglected in the ab initio calculation, i.e. an agreement is to be expected between the theoretical and experimental values.…”

Section: E Comparison Between Theory and Experimentsmentioning

confidence: 99%

“…For example, in case of BaF, such properties are the P, T -odd molecular enhancement factors, W s and W d [8], which are crucial for the interpretation of the NL-eEDM experiment [7], or the W A factor [9], needed for extracting the nuclear anapole moment from future measurements [10]. BaF is particularly interesting for precision experiments due to, among other things, its good laser cooling properties [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

Denis,

Haase,

Mooij

et al. 2022

Preprint

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We present an investigation of the performance of the relativistic multi-reference Fock-space coupled cluster (FSCC) method for predicting molecular hyperfine structure (HFS) constants, including a thorough computational study to estimate the associated uncertainties. In particular, we considered the 19 F HFS constant in the ground and excited states of BaF. Due to a larger basis set dependence, the uncertainties on the excited state results (16-85%) were found to be significantly larger than those on the ground state constants (∼2%).The ab initio values were compared to the recent experimental results, and good overall agreement within the theoretical uncertainties was found. This work demonstrates the predictive power of the FSCC method and the reliability of the established uncertainty estimates, which can be crucial in cases where the calculated property cannot be directly compared to experiment.

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Section: E Comparison Between Theory and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

Denis,

Haase,

Mooij

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…This dramatically reduces the number of populated (internal) rotational and vibrational states, beneficially influencing a variety of research domains ranging from high-resolution molecular spectroscopy, to precise control of chemical reactions, to study of novel dynamics in low-energy collisions. Within the last two decades, BGC has been applied to a number of species including small, light and chemically stable polyatomic molecules (e.g., NH

, CH

F, CF

H, C

), radicals (e.g., NH, CaF, SrF), heavy species (e.g., ThO [ 91 ], YbF [ 92 ], YbOH [ 93 ], TlF [ 94 ], BaH [ 95 ], BaF [ 96 ]), as well as big biomolecules like trans-cinnamaldehyde or gauche-isoprene [ 97 , 98 ].…”

Section: Buffer Gas Coolingmentioning

confidence: 99%

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Amato

Sarno

Aiello

et al. 2020

IJMS

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We review the recent developments in precision ro-vibrational spectroscopy of buffer-gas-cooled neutral molecules, obtained using infrared frequency combs either as direct probe sources or as ultra-accurate optical rulers. In particular, we show how coherent broadband spectroscopy of complex molecules especially benefits from drastic simplification of the spectra brought about by cooling of internal temperatures. Moreover, cooling the translational motion allows longer light-molecule interaction times and hence reduced transit-time broadening effects, crucial for high-precision spectroscopy on simple molecules. In this respect, we report on the progress of absolute frequency metrology experiments with buffer-gas-cooled molecules, focusing on the advanced technologies that led to record measurements with acetylene. Finally, we briefly discuss the prospects for further improving the ultimate accuracy of the spectroscopic frequency measurement.

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“…The brightness is a quantity that gathers these quantities: it expresses the number of molecules in a given internal state per steradian per pulse (or per second). For instance, for a molecule such as BaF + candidate for measurements of the electron electric dipole moment [3] and nuclear spin-dependent parity violation [4,5] + the brightness of buffer gas cooled beams has been demonstrated to attain 5 × 10 10 molecules/sr/pulse [6] + as for similar species such as CaF or SrF [2]. This is typically two orders of magnitude larger than what is obtained with supersonic beams [7].…”

Section: Introductionmentioning

confidence: 98%

Efficient rotational cooling of a cold beam of barium monofluoride

et al. 2022

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In our experiment, molecules of barium monofluoride, initially formed at high temperature due to a laser ablation process, are almost immediately cooled by an adiabatic expansion of argon. Our measurements show that the rotational temperature of the resulting molecular beam is about T_{{\rm rot}}\approx12 K. We demonstrate that the rotation can be cooled to approximately T_{{\rm rot}}\approx0.8 K through an optical pumping of the internal degrees of freedom. This optoical manipulation relies on two light sources coming from tapered amplifiers whose spectra extend over several tens of gigahertz. The first source, dedicated to the rotational cooling of molecules occupying the fundamental vibrational level, is optimized thanks to a spectral shaping whose resolution is comparable to the separation of the relevant rotational levels. The second source is used to pump the molecules back to the fundamental vibrational level when they escape from it. This work focuses on the relevant features of these two types of optical pumping.

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Buffer-gas cooling, high-resolution spectroscopy, and optical cycling of barium monofluoride molecules

Cited by 55 publications

References 68 publications

Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Efficient rotational cooling of a cold beam of barium monofluoride

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