Trapping sites of Li atom in the rare gas crystals Ar, Kr, and Xe: Analysis of stability and manifestation in the EPR spectra

Tarakanova, Anna; Buchachenko, Alexei A.; Bezrukov, Dmitry S.

doi:10.1063/10.0000535

Cited by 8 publications

(9 citation statements)

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“…Since these calculations are of the routine present-day level, we included the discussion of the resulting potentials in the ESI. † A comparison of their equilibrium parameters with the selected literature data (mostly ab initio CCSD(T), fits to experimental data and Tang-Toennies models) 23,81,[83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101] reveals the reasonably good quality of our interaction potentials involving H, He, Li, O, and Ne atoms. The V S B-RG and F-RG potentials have a larger disagreement with the available data.…”

Section: Pccp Papermentioning

confidence: 99%

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Trapping and thermal migration of the first- and second-row atoms in Ar, Kr and Xe crystals

Leibin,

Bezrukov,

Buchachenko

2024

Phys. Chem. Chem. Phys.

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Section: Pccp Papermentioning

confidence: 99%

“…representation of the exponential-spline-dispersion type was used, see ref. 83 for more details. Since these calculations are of the routine present-day level, we included the discussion of the resulting potentials in the ESI.…”

Section: Pccp Papermentioning

confidence: 99%

Trapping and thermal migration of the first- and second-row atoms in Ar, Kr and Xe crystals

Leibin,

Bezrukov,

Buchachenko

2024

Phys. Chem. Chem. Phys.

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“…[7][8][9] The potential δ A(R) is generally expected to change sign at least once at small R for our molecules of interest. 8,9,35,37,[51][52][53][54][55][56][57][58] As a result, the sign of the fitting parameters for binary and molecular shifts need not agree. 34 The molecular energies follow Eqs.…”

Section: Hyperfine-shift Interactionmentioning

confidence: 99%

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

McGuyer

2023

Preprint

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Measurements of the 0-0 hyperfine resonant frequencies of ground-state 85 Rb atoms show a nonlinear dependence on the pressure of the buffer gases Ar, Kr, and Xe. The nonlinearities are similar to those previously observed with 87 Rb and 133 Cs and presumed to come from alkali-metal-noble-gas van der Waals molecules. However, the shape of the nonlinearity observed for Xe conflicts with previous theory, and the nonlinearities for Ar and Kr disagree with the expected isotopic scaling of previous 87 Rb results. Improving the modeling alleviates most of these discrepancies by treating rotation quantum mechanically and considering additional spin interactions in the molecules. Including the dipolar-hyperfine interaction allows simultaneous fitting of the linear and nonlinear shifts of both 85 Rb and 87 Rb in either Ar, Kr, or Xe buffer gases with a minimal set of shared, isotope-independent parameters. To the limit of experimental accuracy, the shifts in He and N 2 were linear with pressure. The results are of practical interest to vaporcell atomic clocks and related devices. CONTENTS Data Availability Statement 17 S-I. Averaging over the direction of rotation 18 S-II. Estimates for the dipolar-and quadrupolar-hyperfine interactions 18 S-III. Pressure-gauge linearization corrections 18 S-IV. Positional shift in Camparo 18 S-V. Predictions for variation with transition and applied field 19 S-VI. Fit parameters for plotted curves 19

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“…Possible trapping sites of alkali atoms in RG crystals, and their stability, have been recently studied in the literature [53][54][55].…”

Section: Numerical Estimates Of the Atoms-matrix Interaction Energiesmentioning

confidence: 99%

Spectroscopy of Alkali Atoms in Solid Matrices of Rare Gases: Experimental Results and Theoretical Analysis

et al. 2022

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We present an experimental and theoretical investigation of the spectroscopy of dilute alkali atoms in a solid matrix of inert gases at cryogenic temperatures, specifically Rubidium atoms in a solid Argon or Neon matrix, and related aspects of the interaction energies between the alkali atoms and the atoms of the solid matrix. The system considered is relevant for matrix isolation spectroscopy, and it is at the basis of a recently proposed detector of cosmological axions, exploiting magnetic-type transitions between Zeeman sublevels of alkali atoms in a magnetic field, tuned to the axion mass, assumed in the meV range. Axions are one of the supposed constituents of the dark matter (DM) of the Universe. This kind of spectroscopy could be also relevant for the experimental search of new physics beyond the Standard Model, in particular the search of violations of time-reversal or parity-charge-conjugation (CP) symmetry. In order to efficiently resolve the axion-induced transition in alkali-doped solid matrices, it is necessary to reduce as much as possible the spectral linewidth of the electronic transitions involved. The theoretical investigation presented in this paper aims to estimate the order of magnitude of the inhomogeneous contribution to the linewidth due to the alkali–matrix interactions (Coulomb/exchange and dispersion), and to compare the theoretical results with our experimental measurements of spectra of dilute Rubidium atoms in Argon and Neon solid matrix. The comparison of the expected or measured spectral linewidths will be important for selecting the most appropriate combination of alkali atoms and matrix inert elements to be used in the proposed axion detection scheme. It is finally suggested that dilute Lithium atoms diffused in a cold parahydrogen solid matrix could be, overall, a good system upon which the proposed detector could be based.

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Trapping sites of Li atom in the rare gas crystals Ar, Kr, and Xe: Analysis of stability and manifestation in the EPR spectra

Cited by 8 publications

References 57 publications

Trapping and thermal migration of the first- and second-row atoms in Ar, Kr and Xe crystals

Trapping and thermal migration of the first- and second-row atoms in Ar, Kr and Xe crystals

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

Spectroscopy of Alkali Atoms in Solid Matrices of Rare Gases: Experimental Results and Theoretical Analysis

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