R-matrix Floquet theory of multiphoton processes: XII. Harmonic generation in magnesium

Abstract
The newly developed R-matrix Floquet theory of harmonic generation is applied to magnesium in its ground state for the case where three photons are needed to reach the first ionization threshold in the perturbative limit. Results are presented both for multiphoton ionization and for harmonic generation where the influence of the low-lying autoionizing states is studied. The results are compared at a qualitative level with those from recent experiments and from other calculations.