"Breakthrough
in the investigation of the 5d elements: history,
current situation and perspectives"
Dr. Vladimir Azarov
Research and Development
Parametric Technology Corporation
11:45 AM Monday, April 9, 2001
Phillips Auditorium
Harvard-Smithsonian Center for Astrophysics
Abstract:
The history, current situation and perspectives of the investigation
of the elements with the open 5d-subshell are discussed. The
study of spectra and structures of atoms and ions of the elements
Ta,W,Re,Os,Ir,Pt,Au,Hg,Tl,Pb and Bi (atomic numbers 73-83) is
under consideration. The ions of interest have the ground state
configuration from 5d^2 through 5d^8 and ionization through 13.
The reasons why the spectra of these ions are currently of
the very interest are given. Difficulties in experimental investigation
of the ions are discussed. The latest theoretical, experimental
and methodological achievements that highly accelerate analyses
of the
most complex spectra and raise the reliability of the data are
presented.
The data will permit to apply and check new theoretical methods
giving a chance to determine higher order relativistic and correlation
effects experimentally and to study them systematically. These
effects are more important and prominent in the heavy 5d elements
compared to the 3d and 4d elements.
Within several years the amount of obtained data will be doubled
compared to the whole history of studying the 5d ions of the
elements from Ta through Bi. The expected jump in quantity (in
the amount of experimental data) will provide a jump in quality.
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