CI Calculations of the Ground State Ionization Potential and Electron Affinity of Aluminum

are presented, included calculations of ionization potential and electron affinity of the 2P o ground state of Al. CI calculations up to double, triple and quadrupole excitations for Al, Al and Al, respectively, where neon fixed core is considered. Appropriate Slater type basis functions were developed suitable to recover both of core-valence and corecore correlation effect. The relativistic effect on both ionization potential and electron affinity are taken into account at the relativistic HartreeFock level. The calculated electron affinity is 432.811 meV which is in excellent agreement with experi-mental value of Sheer et al. 432.83(5) meV, whereas the calculated ionization potential is 5985.764 meV, the latter is in perfect agreement with experimental value of 5985.768 meV