Origin of Two-Electron, One-Photon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>—X-Ray Transitions

Abstract

Hartree-Fock energy and intensity calculations show that the two-electron, one-photon ${K}^{2}\ensuremath{-}{L}^{2}$---x-ray transitions recently reported are due to $1{s}^{\ensuremath{-}2}\ensuremath{\rightarrow}2{s}^{\ensuremath{-}1}2{p}^{\ensuremath{-}1}$ electric dipole transitions. The mechanism which we use to describe the $1{s}^{\ensuremath{-}2}\ensuremath{\rightarrow}2{s}^{\ensuremath{-}1}2{p}^{\ensuremath{-}1}$ transition is based on a "shake-down" model.