Ab initio Calculations of Energy Levels in Be-Like Xenon › Научные исследования в СПбГУ

Standard

Ab initio Calculations of Energy Levels in Be-Like Xenon : Strong Interference between Electron-Correlation and QED Effects. / Malyshev, A. V.; Glazov, D. A.; Kozhedub, Y. S.; Anisimova, I. S.; Kaygorodov, M. Y.; Shabaev, V. M.; Tupitsyn, I. I.

в: Physical Review Letters, Том 126, № 18, 183001, 03.05.2021.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

BibTeX

@article{6ee72cb24188415eb5ff9163f32c55eb,

title = "Ab initio Calculations of Energy Levels in Be-Like Xenon: Strong Interference between Electron-Correlation and QED Effects",

abstract = "The strong mixing of close levels with two valence electrons in Be-like xenon greatly complicates ab initio QED calculations beyond the first-order approximation. Because of a strong interplay between the electron-electron correlation and QED effects, the standard single-level perturbative QED approach may fail, even if it takes into account the second-order screened QED diagrams. In the present Letter, the corresponding obstacles are overcome by working out the QED perturbation theory for quasidegenerate states. The contributions of all the Feynman diagrams up to the second order are taken into account. The many-electron QED effects are rigorously evaluated in the framework of the extended Furry picture to all orders in the nuclear-strength parameter αZ. The higher-order electron-correlation effects are considered within the Breit approximation. The nuclear recoil effect is accounted for as well. The developed approach is applied to high-precision QED calculations of the ground and singly excited energy levels in Be-like xenon. The most accurate theoretical predictions for the binding and excitation energies are obtained. These results deviate from the most precise experimental value by 3σ but perfectly agree with a more recent measurement.",

keywords = "LAMB-SHIFT, CONFIGURATION-INTERACTION, TRANSITION-PROBABILITIES, 2S(1/2)-2P(3/2) LEVELS, GROUND-STATE, 2-PHOTON-EXCHANGE, IONS",

author = "Malyshev, {A. V.} and Glazov, {D. A.} and Kozhedub, {Y. S.} and Anisimova, {I. S.} and Kaygorodov, {M. Y.} and Shabaev, {V. M.} and Tupitsyn, {I. I.}",

year = "2021",

month = may,

day = "3",

doi = "10.1103/PhysRevLett.126.183001",

language = "English",

volume = "126",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "18",

}

RIS

TY - JOUR

T1 - Ab initio Calculations of Energy Levels in Be-Like Xenon

T2 - Strong Interference between Electron-Correlation and QED Effects

AU - Malyshev, A. V.

AU - Glazov, D. A.

AU - Kozhedub, Y. S.

AU - Anisimova, I. S.

AU - Kaygorodov, M. Y.

AU - Shabaev, V. M.

AU - Tupitsyn, I. I.

PY - 2021/5/3

Y1 - 2021/5/3

N2 - The strong mixing of close levels with two valence electrons in Be-like xenon greatly complicates ab initio QED calculations beyond the first-order approximation. Because of a strong interplay between the electron-electron correlation and QED effects, the standard single-level perturbative QED approach may fail, even if it takes into account the second-order screened QED diagrams. In the present Letter, the corresponding obstacles are overcome by working out the QED perturbation theory for quasidegenerate states. The contributions of all the Feynman diagrams up to the second order are taken into account. The many-electron QED effects are rigorously evaluated in the framework of the extended Furry picture to all orders in the nuclear-strength parameter αZ. The higher-order electron-correlation effects are considered within the Breit approximation. The nuclear recoil effect is accounted for as well. The developed approach is applied to high-precision QED calculations of the ground and singly excited energy levels in Be-like xenon. The most accurate theoretical predictions for the binding and excitation energies are obtained. These results deviate from the most precise experimental value by 3σ but perfectly agree with a more recent measurement.

AB - The strong mixing of close levels with two valence electrons in Be-like xenon greatly complicates ab initio QED calculations beyond the first-order approximation. Because of a strong interplay between the electron-electron correlation and QED effects, the standard single-level perturbative QED approach may fail, even if it takes into account the second-order screened QED diagrams. In the present Letter, the corresponding obstacles are overcome by working out the QED perturbation theory for quasidegenerate states. The contributions of all the Feynman diagrams up to the second order are taken into account. The many-electron QED effects are rigorously evaluated in the framework of the extended Furry picture to all orders in the nuclear-strength parameter αZ. The higher-order electron-correlation effects are considered within the Breit approximation. The nuclear recoil effect is accounted for as well. The developed approach is applied to high-precision QED calculations of the ground and singly excited energy levels in Be-like xenon. The most accurate theoretical predictions for the binding and excitation energies are obtained. These results deviate from the most precise experimental value by 3σ but perfectly agree with a more recent measurement.

KW - LAMB-SHIFT

KW - CONFIGURATION-INTERACTION

KW - TRANSITION-PROBABILITIES

KW - 2S(1/2)-2P(3/2) LEVELS

KW - GROUND-STATE

KW - 2-PHOTON-EXCHANGE

KW - IONS

UR - http://www.scopus.com/inward/record.url?scp=85105709091&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.183001

DO - 10.1103/PhysRevLett.126.183001

M3 - Article

AN - SCOPUS:85105709091

VL - 126

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 18

M1 - 183001

ER -

ID: 76943653

Ab initio Calculations of Energy Levels in Be-Like Xenon: Strong Interference between Electron-Correlation and QED Effects

Standard

Harvard

APA

Vancouver

Author

BibTeX

RIS