Fundamental Physical Constants: Search Results and Variation Descriptions

Бронников, К. А.; Ivashchuk, V. D.; Khrushchev, V. V.

doi:10.1007/s11018-022-02062-z

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Cold molecules have aroused much interest from researchers [1][2][3][4][5], due to the wide applications in areas such as the measurement of fundamental physical constants [6][7][8], quantum information [9,10] and collision reaction [11][12][13][14]. In order to produce cold molecules, researchers proposed direct and * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

Zhang,

Hu,

Wang

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Photoassociation (PA) of 85Rb atoms from the ground X 1 Σ g + state to the excited A 1 Σ g + and b 3 Π u states by two-color laser pulses at 100 μ K × k B is investigated by using quantum wavepacket method. Two pulses with detunings δ 1 and δ 2 varying from −1.0 to 1. cm−1 are taken into account. The specific case δ 1 = − δ 2 is generalized to the condition of arbitrary combination of δ 1 and δ 2 for both the Gaussian-pulse field and the slowly-turned-on and rapidly-turned-off (STRT) field. It is found that the introduce of the detunings in the two pluses can enhance the asymmetry of the time profile and broaden the linewidth of the laser field. The two factors can further enhance the PA probability for both resonant and nonresonant regions. Compared to the Gaussian field, the STRT field which is even more asymmetric in time profile and more broaden in linewidth can significantly enhance the PA probability, with the nonresonant transition dominating the PA process. It can be expected that once the two detunings are both positive, which is a relatively loose restriction for coherent control, a considerable PA probability can be obtained in a two-color STRT field.

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Section: Introductionmentioning

confidence: 99%

Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

Zhang,

Hu,

Wang

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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The electromagnetic fine-structure constant in primordial nucleosynthesis revisited

Meißner,

Metsch,

Meyer

2023

Eur. Phys. J. A

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We study the dependence of the primordial nuclear abundances as a function of the electromagnetic fine-structure constant $$\alpha $$ α , keeping all other fundamental constants fixed. We update the leading nuclear reaction rates, in particular the electromagnetic contribution to the neutron-proton mass difference pertinent to $$\beta $$ β -decays, and go beyond certain approximations made in the literature. In particular, we include the temperature-dependence of the leading nuclear reactions rates and assess the systematic uncertainties by using four different publicly available codes for Big Bang nucleosynthesis. Disregarding the unsolved so-called lithium-problem, we find that the current values for the observationally based $${}^{2}\text {H}$$ 2 H and $${}^{4}\text {He}$$ 4 He abundances restrict the fractional change in the fine-structure constant to less than $$2\%$$ 2 % , which is a tighter bound than found in earlier works on the subject.

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Fundamental Physical Constants: Search Results and Variation Descriptions

Cited by 2 publications

References 31 publications

Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

The electromagnetic fine-structure constant in primordial nucleosynthesis revisited

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Fundamental Physical Constants: Search Results and Variation Descriptions

Cited by 2 publications

References 31 publications

Steering photoassociation of cold 85Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

Steering photoassociation of cold 85Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

The electromagnetic fine-structure constant in primordial nucleosynthesis revisited

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Product

Resources

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Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses

Steering photoassociation of cold ⁸⁵Rb atoms by two-color slowly-turned-on and rapidly-turned-off laser pulses