Neogi, A;Kennedy, ET;Mosnier, JP;van Kampen, P;Costello, JT;McGuinness, C;O'Sullivan, G

2001

October

Journal Of Physics B: Atomic, Molecular And Optical Physics

Vacuum-ultraviolet absorption spectrum of the Rb+ ion in a laser-generated plasma

Published

4 ()

EXTREME-ULTRAVIOLET AUGER DECAY PHOTOIONIZATION PHOTOABSORPTION SPECTROSCOPY RESONANCES RADIATION ELECTRON STATES

34

651

656

Discrete features due to 3d photoexcitation in Rb+ have been observed and measured in the 100-140 eV photon energy range using the dual laser-produced plasma technique. Lines due to 3d(10)4S(2)4p(6)-3d(9)4s(2)4p(6)np (n = 5-8) are identified with the aid of configuration-interaction Hartree-Fock calculations. An upper limit of 0.1 eV for the linewidths of the 3d(9)4S(2)4p(6)5p and 3d(9)4S(2)4p(6)6p levels was deduced from the data. This value is comparable to Auger widths obtained from electron spectroscopy of near neighbours atomic Kr and Rb. The Hartree-Fock calculations also predict that the np electron is largely a spectator in the decay of the 3d(-1)np states. The overall appearance of the spectrum is accounted for by a relativistic time-dependent local density approximation (RTDLDA) calculation. Above the 3d threshold, the relative photoionization cross section is seen to increase monotonically reaching a peak near 200 eV This observation is explained as a delayed onset in the 3d-epsilonf crass section.

BRISTOL

0953-4075