ANGULAR-DISTRIBUTION OF THE FLUORESCENCE RADIATION OF KR-II SATELLITESTATES

Photon-induced fluorescence spectroscopy was applied for the first tim e to investigate the anisotropy of VUV radiation emitted from Kr II sa tellite states with total angular momentum (J) over bar greater than o r equal to 3/2 after the photoionization of the Kr atom by linearly po larized synchrotron radiation near the 4s threshold. The measurements showed that the sign of the alignment parameter is practically indepen dent of the exciting-photon energy for the ionic state with (J) over b ar = 5/2, whereas for the states with (J) over bar = 3/2 the alignment parameter changes sign with varying energy. Simple formulae connectin g the angular distribution parameter and the alignment parameter with the kinematics of our experiment and with quantities describing the dy namics of the photoionization were derived in closed-form. Partial and total cross sections for the photoionization of 4p, 4s and several sa tellite levels were calculated taking into account many-electron corre lations and doubly-excited states. For the satellite states with (J) o ver bar greater than or equal to 3/2 the dependence of the angular dis tribution parameter on the exciting-photon energy was calculated. Good overall agreement between theory and experiment was obtained.