Resonant enhancement of dielectronic recombination by a high-frequency microwave field

Dielectronic recombination via the Ba 6p3/2nl states from a continuum of finite bandwidth is resonantly enhanced by a 38.8-GHz microwave field at the energies for which the Δn=1, 2, ..., k transitions of the intermediate 6p1/2nl states are resonant with the microwave frequency. The mechanism is resonant Stark mixing of high and low l states by the microwave field. While static field enhancement of dielectronic recombination occurs at fields scaling as n-5, the field required for enhancement of the Δn=k, k≥2 resonances is roughly n independent