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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 1999 The American Physical Society
- ISSN
- 1094-1622
- DOI
- 10.1103/PhysRevA.60.198
- Publisher site
- See Article on Publisher Site
Abstract
Using time-resolved UV laser-induced fluorescence from a laser-produced plasma, natural radiative lifetimes have been measured for 21 levels of Ge I belonging to the odd-parity 4 p 4 d , 4 p 5 d , and 4 p 6 s configurations. Stimulated Brillouin scattering in water has allowed us to compress Nd:YAG laser pulses pumping a dye laser (where YAG denotes yttrium aluminum garnet), thus yielding 1-ns tunable laser pulses to enable accurate measurements of short lifetimes. Branching ratios of Ge I have been measured by inductively coupled plasma emission spectrometry, the intensity calibration being performed by means of Ar lines emitted by a hollow-cathode lamp. The experimental lifetimes and branching ratios have been combined in order to provide a set of accurate transition probabilities for the 4 p - 5 s and 4 p - 4 d transitions. A relativistic Hartree-Fock calculation, taking configuration-interaction and polarization effects into account, has been combined with a least-squares optimization procedure of the Slater and spin-orbit integrals in order to test the ability of this approach to correctly predict radiative properties of the group-IV elements. Good agreement between experimental and theoretical transition probability values has been achieved for most of the transitions considered.
Journal
Physical Review A – American Physical Society (APS)
Published: Jul 1, 1999