Electron excitation of the^1,3D states of calcium and strontium

Abstract

We have used the relativistic distorted-wave method to calculate the excitation of the three lowest-lying singlet and triplet D states, for both calcium and strontium. Results are presented for both the differential cross sections and Stokes parameters, for electron impact at 20 and 40 eV. Two different sets of wavefunctions were used, in order to assess the importance of configuration interaction for these states.

Electron-impact excitation and ionization of atomic calcium at intermediate energies

“…The limited 6-state closecoupling calculations in this work did not achieve a comprehensive reproduction of the experimental data, but they were able to explain the principal features. Among other works, we note the RDW calculations by Muktavat et al [15] concerning excitation of the low-lying 3d4s 1,3 D states in Ca. These states, along with the strong exchange transition to the 4s4p 3 P o state, were also considered in our previous calculations [12], where considerable disagreement with the RDW results was found.…”

Electron impact excitation of the 41P1state of calcium

“…While they also included some results for excitation from the ground state, the excitation of the 4 1 P state of interest here was not among these. We have also calculated the excitation of the 4 1,3 D states of calcium by electron impact using the RDW method (Muktavat et al 2002).…”

Differential and integrated cross sections for the electron excitation of the 41Postate of calcium atom

“…Relativistic effects such as spin-orbit coupling of the excited atomic states are included, and distorted waves describing the scattered electron were calculated from the corresponding Dirac equation. Recently, Muktavat et al [31] extended these calculations to electron excitation of the 1,3 D states of calcium.…”