Electron impact collision strengths for excitation of highly charged ions (open access)

Electron impact collision strengths for excitation of highly charged ions

The principle task given us by the Lawrence Livermore National Laboratory (LLNL) to perform under Subcontract 6181405 was to develop a method and corresponding computer programs to make very rapid, yet accurate, fully relativistic and quasirelativistic calculations of cross sections or collision strengths for electron impact excitation of highly charged ions with any value for the nuclear charge number Z. Also while this major code development was being done we were asked to calculate cross sections of interest using our previous rapid, more approximate codes, which used hydrogenic basis functions and screening constants with both the electron-electron Coulomb interaction and relativistic interactions included by perturbation theory. We were also asked to determine the branching ratio for ionization to various final states in complex cases, where two or more states corresponding to the final configuration of the ion were possible.
Date: August 20, 1990
Creator: Sampson, D.H. (Pennsylvania State Univ., University Park, PA (USA). Dept. of Astronomy and Astrophysics)
System: The UNT Digital Library