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• W1973606979 endingPage "1784" @default.
• W1973606979 startingPage "1773" @default.
• W1973606979 abstract "A theory for calculating a many-transition spectrum of electron-ion collisional excitations in the distorted-wave approximation (DWA) is presented. First, it is shown that the collision strength including exchange can be factorized into (i) a radial part, involving one-electron wave functions only, and the summation over partial waves of the continuum electron; and (ii) an angular part, involving the coupling between bound electrons in the target states only, specific to each transition. Factorized representations of the collision strengths are derived in various coupling schemes. Second, the computationally involved radial part is shown to be a smooth function of transition energies over a very wide range, allowing easy interpolation. These two results enable one to obtain a complete collisional-excitation array with a drastic reduction of the number of time-consuming radial calculations compared with standard methods. This allows the solution of problems which were heretofore considered impractical. As an illustration, the whole array of excitation rate coefficients for Ni-like Gd xxxvii including the lowest 107 levels (5671 transitions) was calculated in the DWA, and used in a steady-state collisional-radiative model. Resulting population inversions are presented versus plasma density." @default.
• W1973606979 created "2016-06-24" @default.
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• W1973606979 date "1988-08-01" @default.
• W1973606979 modified "2023-10-17" @default.
• W1973606979 title "Electron collision excitations in complex spectra of ionized heavy atoms" @default.
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• W1973606979 doi "https://doi.org/10.1103/physreva.38.1773" @default.
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