Resonant Auger decay ofXe*4d5∕2−1

Abstract

Fluorescence polarimetry has been used to determine the relative partial-wave Auger decay widths for transitions to states of the Xe II 5p 4 6p multiplet after photoexcitation of the Xe * 4d 5/2 −1 6p͑J * =1͒ resonance by linearly and circularly polarized synchrotron radiation. Combination with data on the angular distribution and spin polarization of the Auger electrons, providing information on the relative phases of the amplitudes, constitutes the complete experiment on the Auger decay. Multiconfiguration relativistic calculations of the amplitudes have been performed and compared to the measurements.

Universal scaling of resonances in vector correlation photoionization parameters

“…As expected, the values of˜ and extracted from the alignment and orientation of the 5p 4 ( 3 P 2 )6p [1] 3/2 state were identical within the error bars, despite the completely different shapes of the corresponding resonance profiles. At the resonance position, the values for the alignment and orientation coincide with those given already in our earlier study [31] 20 and A 10 are very broad pointing to the scaling factor χ of around 10. We would like to stress here that equation (3) for the ion orientation and alignment includes only partial-wave cross sections (for example [31]) and therefore the broadening is not related to the phase difference between the amplitudes as suggested in [15].…”

“…As a result, for the photon energy of 65.1 eV, the amplitudes D 3/2 and D 5/2 decrease and change sign. The s 1/2 channel contributes much less for the state 6 than for the state 19 [31]; therefore, the numerator of (14) keeps the sign, while it is changed for the denominator.…”

“…To estimate r we utilize matrix elements V j (j = 1/2, 3/2, 5/2) for the states 6 and 19 from our recent calculations, confirmed by complete experiment on the Auger decay [31,32], and multiconfiguration Dirac-Fock [40] amplitudes D j . The sign of all terms in the numerator and the denominator of (14) turned out to be the same and r ≈ 1.…”

“…A similar experiment, using linearly polarized photons and a narrower excitation region, was performed recently in order to study, for the resonant 3d-np excitation of Kr, the influence of close lying resonances on the polarization state of the photoion [33]. [30,31]. The alignment and the orientation are particular cases of vectorcorrelation parameters described by general formula (3).…”

“…In order to observe and to verify the scaling effect, we use our recent studies of alignment and orientation parameters of the Xe photoion in the region of the Xe 4d −1 5/2 6p (J = 1) resonance by means of ion fluorescence polarimetry [30][31][32]. The experiments were performed at the CIPO (Circular Polarization) beamline of the ELETTRA synchrotron radiation facility in Trieste (Italy).…”