Frozen-planet resonances in doubly excited helium atom; adiabatic approach

Abstract: An improved adiabatic method is applied to study the highly excited asymmetric two-electron configurations of helium atom known as frozen-planet resonances. It is shown that our approach provides much better agreement with numerically calculated resonance positions than the previously used Born–Oppenheimer type approximation. Wide range of states were studied, related to N = 7 − 15 first-ionization thresholds. We show that estimates of tunneling widths of these states however are not reliable, because of the breakdown of adiabatic approximation in the underbarrier region of configuration space. We also provide computational evidence that a single-potential approximation in hyperspherical coordinates would be inferior to our approach. Graphical abstract: [Figure not available: see fulltext.]. © 2020, EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature.

Authors
Grozdanov T.P.1 , Gusev A.A. 2 , Solov’ev E.A.2 , Vinitsky S.I. 2, 3
Publisher
Springer New York LLC
Number of issue
7
Language
English
Status
Published
Number
161
Volume
74
Year
2020
Organizations
  • 1 Institute of Physics, University of Belgrade, Pregrevica 118, Belgrade, 11080, Serbia
  • 2 Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russian Federation
  • 3 Peoples’ Friendship University of Russia (RUDN University), Moscow, 117198, Russian Federation
Keywords
Atomic Physics
Date of creation
02.11.2020
Date of change
02.11.2020
Short link
https://repository.rudn.ru/en/records/article/record/64577/