Abstract

The experimental investigation of influence of perturbation on multiphoton ionization of Sr and Ba atoms by using tunable IR radiation of laser on colour centres (ω = 8200-9100 cm^–1) was performed. The obtained results of Investigations show that influence on Sr and Ba atoms of used radiation leads to strong dynamic Stark effect in these atoms. The investigations also showed that the character of manifestation of this effect at multiphoton ionization depends on correlation of laser radiation frequency (ω) and frequencies relevant to multiphoton excitation of unperturbed states (ω₁) and one-photon transition from these states to other states (ω₂).So, in case when the ω=ω₁≠ω₂ correlation takesplace the wellknown case of Stark effect manifestation 13 realized. In this case the detunings and widths of resonant maxima have quadratic dependence on laser field strength ɛ.

© 1996 IEEE