Neogi, A;Kennedy, ET;Mosnier, JP;van Kampen, P;Costello, JT;O'Sullivan, G;Mansfield, MWD;Demekhin, PV;Lagutin, BM;Sukhorukov, VL

2003

April

Physical Review A - Atomic, Molecular, and Optical Physics

Trends in autoionization of Rydberg states converging to the 4s threshold in the Kr-Rb+-Sr2+ isoelectonic sequence: Theory and experiment

Published

14 ()

ATOMS NEAR-THRESHOLD ULTRAVIOLET ABSORPTION-SPECTRUM AMPLIFIED SPONTANEOUS EMISSION THEORETICAL CROSS-SECTIONS LASER-GENERATED PLASMA FREE-ELECTRON LASER ANGULAR-DISTRIBUTIONS SYNCHROTRON-RADIATION PHOTOIONIZATION IONS

67

We have measured the photoabsorption spectra of the Kr-like ions Rb+ and Sr2+ at photon energies corresponding to the excitation of 4s-np resonances using, the dual laser plasma photoabsorption technique. Dramatic changes in the line profiles, with increasing ionization and also proceeding along the Rydberg series of each ion, are observed and explained by the trends in 4s-transition amplitudes computed within a framework of configuration-interaction Pauli-Fock calculations. Total photoionization cross sections show very good agreement with relative absorption data extracted from the measured spectra.

COLLEGE PK

1050-2947

10.1103/PhysRevA.67.042707