Precision tests of nonadiabatic perturbation theory with measurements on the DT molecule

Lai, K.-F.; Czachorowski, Paweł; Schlösser, M.; Puchalski, Mariusz; Komasa, Jacek; Pachucki, Krzysztof; Ubachs, Wim; Salumbides, E. J.

doi:10.1103/physrevresearch.1.033124

Cited by 17 publications

(23 citation statements)

References 55 publications

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“…For instance, the fundamental vibrational line corresponding to the v = 1 → 0 transition has been observed in the Q branch, i. e. in J = 0 transitions, with high accuracy for H 2 , HD, and D 2 [53][54][55]. Moreover, the world's best spectra of molecules containing Tritium have been recently obtained using Coherent Anti-Stokes Raman Scattering Spectroscopy (CARS) for T 2 and DT [56][57][58]. A relative precision of up to O(10 −10 ) has been reached in these measurements.…”

Section: Spectroscopy Of Molecular Hydrogen and Its Isotopologuesmentioning

confidence: 99%

“…Another advantage of the new technique is the use of smaller probe volumes, which is especially advantageous when dealing with a radioactive gas like Tritium. This allowed to record the world best spectrum of molecular Tritium T 2 [56,57] and recently of DT [58], see Table 1 for the measurement of T 2 . Note that there is a discrepancy between theory and experiment in some lines of the T 2 spectrum, which might be explained by New Physics effects.…”

Section: Experimental Statusmentioning

confidence: 99%

“…The fifth force analyses of Refs. [25] and [58] only constrain the last term of Eq. (11) with the replacement g NN 4π → α 5 .…”

Section: New Physics Coupled To Electrons and Nucleimentioning

confidence: 99%

“…Note that our limits are weaker than the ones presented in Refs. [25,58] as a consequence of a more conservative exclusion criterion by allowing for 3σ deviations.…”

Section: Scalar and Pseudoscalar Potentialsmentioning

confidence: 99%

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A study of New Physics searches with tritium and similar molecules

2020

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Searches for New Physics focus either on the direct production of new particles at colliders or at deviations from known observables at low energies. In order to discover New Physics in precision measurements, both experimental and theoretical uncertainties must be under full control. Laser spectroscopy nowadays offers a tool to measure transition frequencies very precisely. For certain molecular and atomic transitions the experimental technique permits a clean study of possible deviations. Theoretical progress in recent years allows us to compare ab initio calculations with experimental data. We study the impact of a variety of New Physics scenarios on these observables and derive novel constraints on many popular generic Standard Model extensions. As a result, we find that molecular spectroscopy is not competitive with atomic spectroscopy and neutron scattering to probe new electron-nucleus and nucleus-nucleus interactions, respectively. Molecular and atomic spectroscopy give similar bounds on new electron-electron couplings, for which, however, stronger bounds can be derived from the magnetic moment of the electron. In most of the parameter space H$$_2$$ 2 molecules give stronger constraints than T$$_2$$ 2 or other isotopologues.

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Section: Spectroscopy Of Molecular Hydrogen and Its Isotopologuesmentioning

confidence: 99%

Section: Experimental Statusmentioning

confidence: 99%

“…The fifth force analyses of Refs. [25] and [58] only constrain the last term of Eq. (11) with the replacement g NN 4π → α 5 .…”

Section: New Physics Coupled To Electrons and Nucleimentioning

confidence: 99%

“…Note that our limits are weaker than the ones presented in Refs. [25,58] as a consequence of a more conservative exclusion criterion by allowing for 3σ deviations.…”

Section: Scalar and Pseudoscalar Potentialsmentioning

confidence: 99%

See 2 more Smart Citations

A study of New Physics searches with tritium and similar molecules

2020

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“…The reason was due to the stringent safety requirements to hold the radioactive species, which results in limited access and handling difficulty in the experimental study of these systems [6]. Some of the empirical studies on the first vibrational frequencies for these systems were reported for T2 molecule [7], DT molecule [8], and the most recent one for HT, DT, and T2 molecules [6]. With these recent experimental reports, theoretical models to study the systems, especially for the fundamental tone, can be tested for all molecular hydrogen isotopes.…”

Section: ■ Introductionmentioning

confidence: 99%

A Theoretical Study on Vibrational Energies of Molecular Hydrogen and Its Isotopes Using a Semi-classical Approximation

et al. 2021

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This study aims to apply a semi-classical approach using some analytically solvable potential functions to accurately compute the first ten pure vibrational energies of molecular hydrogen (H2) and its isotopes in their ground electronic states. This study also aims at comparing the accuracy of the potential functions within the framework of the semi-classical approximation. The performance of the approximation was investigated as a function of the molecular mass. In this approximation, the nuclei were assumed to move in a classical potential. The Bohr-Sommerfeld quantization rule was then applied to calculate the vibrational energies of the molecules numerically. The results indicated that the first vibrational transition frequencies (v1ß0) of all hydrogen isotopes were consistent with the experimental ones, with a minimum percentage error of 0.02% for ditritium (T2) molecule using the Modified-Rosen-Morse potential. It was also demonstrated that, in general, the Rosen-Morse and the Modified-Rosen-Morse potential functions were better in terms of calculating the vibrational energies of the molecules than Morse potential. Interestingly, the Morse potential was found to be better than the Manning-Rosen potential. Finally, the semi-classical approximation was found to perform better for heavier isotopes for all potentials applied in this study.

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Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

Gianfrani,

Hu,

Ubachs

2024

Riv. Nuovo Cim.

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Cavity-enhanced spectroscopic techniques are highly sensitive laser-based methods for interrogating the atomic and molecular constituents of any gaseous medium that is confined into an optical resonator. A first advantage over conventional absorption spectroscopy comes from the extremely long path length of the laser radiation inside the stable, high-finesse, optical cavity, which allows the sample to be probed over several tens of kilometers. After more than 30 years of research and development, techniques like cavity ring-down spectroscopy, cavity-enhanced absorption spectroscopy, and noise-immune cavity-enhanced optical-heterodyne molecular spectroscopy, have reached extraordinary levels of detection sensitivity, such that it is possible to measure light absorption from molecules in trace amounts or extremely weak spectral lines of more abundant species. A second advantage of the use of high-finesse cavities lies in the power amplification achieved inside the optical resonator, making it possible to saturate even weak transitions, thus reducing the width of spectral lines by some three orders of magnitude. Combining these methods with frequency comb technologies has further enhanced their capabilities, adding metrology-grade qualities to spectroscopic determinations such as transition frequencies of molecular resonances, which can be measured with sub-kHz accuracy. In this review article, we discuss the current status of highly precise and highly sensitive laser spectroscopy for fundamental tests and measurements. We describe state-of-the-art molecular spectroscopy methods and their application to a few selected molecules of fundamental importance in understanding quantum chemistry theories or testing quantum electrodynamics.

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Precision tests of nonadiabatic perturbation theory with measurements on the DT molecule

Cited by 17 publications

References 55 publications

A study of New Physics searches with tritium and similar molecules

A study of New Physics searches with tritium and similar molecules

A Theoretical Study on Vibrational Energies of Molecular Hydrogen and Its Isotopes Using a Semi-classical Approximation

Advances in cavity-enhanced methods for high precision molecular spectroscopy and test of fundamental physics

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