van Kampen, P;Gerth, C;Martins, M;Carroll, PK;Hirsch, J;Kennedy, ET;Meighan, O;Mosnier, JP;Zimmermann, P;Costello, JT

2000

June

Physical Review A - Atomic, Molecular, and Optical Physics

Photoabsorption and photoion spectroscopy of atomic uranium in the region of 6p and 5d excitations

Published

7 ()

GIANT-DIPOLE-RESONANCE CONTINUUM STATE THORIUM BA PHOTOELECTRON ABSORPTION SPECTRUM PLASMA METAL XE

61

The photoabsorption process in atomic uranium has been investigated experimentally and theoretically in the 15-150-eV region. Using the dual laser plasma technique, the 6p photoabsorption spectrum has been recorded while for the first time the 5d region has been remeasured photoelectrically using both photoabsorption and photoion spectroscopy. Interpretation of the photoabsorption spectra is supported by Hartree-Fock calculations which take into account spin-flip decay and the interaction of many discrete states with many continua. The 6p spectrum is entirely dominated by spin-orbit split 6p-->6d transitions. The Sd-subshell photoabsorption is shown to consist predominantly of discrete 5d-->5f excitations; here the electrostatic and spin-orbit interactions are comparable in strength.

COLLEGE PK

1050-2947