Dielectronic recombination ofMg+in the presence of electric fields

Electric field mixing and ionization effects on the dielectronic recombination of ${\mathrm{Mg}}^{+}$ are studied within the context of the standard resonance cross-section expression. The eigenvectors for the doubly excited Rydberg states were determined by diagonalizing a Hamiltonian matrix which includes internal electrostatic, spin-orbit, and external field Stark elements. Rydberg-state ionization rates are determined using the hydrogenic formula of Damburg and Kolosov. A detailed comparison is made between theory and the recent variable-field crossed-beam measurements of Müller et al.