Atomic Structure Calculations of Helium with Correlated Exponential Functions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10436092" target="_blank" >RIV/00216208:11320/21:10436092 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3_f7X~nCty" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3_f7X~nCty</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/sym13071246" target="_blank" >10.3390/sym13071246</a>

Result language
angličtina
Original language name
Atomic Structure Calculations of Helium with Correlated Exponential Functions
Original language description
The technique of quantum electrodynamics (QED) calculations of energy levels in the helium atom is reviewed. The calculations start with the solution of the Schrodinger equation and account for relativistic and QED effects by perturbation expansion in the fine structure constant alpha. The nonrelativistic wave function is represented as a linear combination of basis functions depending on all three interparticle radial distances, r(1), r(2) and r = vertical bar(r) over right arrow (1) - (r) over right arrow (2)vertical bar. The choice of the exponential basis functions of the form exp(-alpha r(1) - beta r(2) - gamma(r)) allows us to construct an accurate and compact representation of the nonrelativistic wave function and to efficiently compute matrix elements of numerous singular operators representing relativistic and QED effects. Calculations of the leading QED effects of order alpha(5)m (where m is the electron mass) are complemented with the systematic treatment of higher-order alpha(6)m and alpha(7)m QED effects.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GA18-00918S" target="_blank" >GA18-00918S: Quantum Dynamics of Astrophysically Important Molecules</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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