The interference effects in the alignment and orientation of the KrII 4p45p states following KrI 3d9np resonance excitation

The energy dependence of the alignment parameter A(20) for the Kr II 4p (4)5p(E-1 J(1)) states following excitation in the Raman regime with the exciting-photon energy passing through the Kr I 3d9/jnp(j)(-) resonances was investigated theoretically and experimentally. Interference between the resonance and direct photoionization channels explains the dependence of A(20) on the excitation energy. Experimentally, A(20) was determined after the analysis of 5p-5s fluorescence decay of the 4p(4)5p(E-1 J(1)) states excited with monochromatized synchrotron radiation. The band pass of the synchrotron radiation was set to 10 meV which is smaller than the natural width of the 3d(9)np resonances (similar to83 meV). Additionally, a strong energy dependence was predicted for the orientation parameter 010 as well as for the angular distribution parameter of photoelectrons, beta(e), for several 4p(4)5p(E-1 J(1)) ionic states.