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\begin{dpgabstract}
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\Titel{On the Summation of the Perturbation 
Expansion of the Correlation Energy}        %Title

% The addresses of the authors are defined by the command
%   '\Adresse{AddressAbbreviation}{address}'.
% The AddressAbbreviation is used for the assignment author <-> address
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\Adresse{reg}{Institut f\"ur Physikalische und Theoretische Chemie,
Universit\"at Regensburg}      %address

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%   '\Sprecher{AddressAbbreviation}{first name}{last name}' (=speaker) and 
%   '\Koautor{AddressAbbreviation}{first name}{last name}' (co--author) are
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% determined yet, please define all authors as co--authors. Please use
% one command (\Sprecher or \Koautor) for each author. All authors are
% listed in the given succession.

\Sprecher{reg}{Herbert H. H.}{Homeier}     %speaker
%\Koautor{}{}{}      %coauthor

\KurzfassungAnfang      %abstract -- begin

One of the standard methods for the computation of the correlation energy of molecular systems
is many-body perturbation theory. For smaller molecules, the computation of the 
perturbation series for the ground state energy up to fifth order can be done. As shown in [1],
term-by-term summation of the perturbation expansion can be improved using a variant of a 
method where the unperturbed Hamilton operator is rescaled [2,3].        
The scaling parameter is chosen variationally such that the
renormalized correlation energy in some order is independent of the parameter. 
Pad\'e approximants are an alternative method to resum the perturbation series. Certain
approximants are also invariant under the scaling [4]. 


\Zitat{1}{C. Schmidt, M. Warken, and N. C. Handy, Chem. Phys. Lett. {\bf 211}, 272 (1993)}
\Zitat{2}{P. Goldhammer and E. Feenberg, Phys. Rev. {\bf 101},  1233  (1956)}
\Zitat{3}{E. Feenberg, Phys. Rev. {\bf 103},  1116  (1956)}
\Zitat{4}{S. Wilson, D. M. Silver, and R. A. Farrell, Proc. R. Soc. Lond. A. {\bf 356}, 363  (1977)}

\KurzfassungEnde        %abstract -- end

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\Tagungsjahr{1996} % year in which the meeting takes place
\Fachverband{CP} % section -- Please take the abbreviation from the
               %             file 'anpassg.tex'.
\Themenkreis{9} % topic    -- Please take the number from the 
               %             file 'anpassg.tex'.
% English title for the registration to the Physics Briefs:
\title{On the Summation of the Perturbation 
Expansion of the Correlation Energy}

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\PACS{}

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% group report).
\Vortrag  % 
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%\Gruppenbericht % 

% Please fill in here the complete address (incl. the telephone number)
% of the contributor.
\Anschrift{Dr. Herbert H. H. Homeier\\
Institut fuer Physikalische und Theoretische Chemie\\
Universitaet Regensburg\\
D-93040 Regensburg, Germany\\
Phone: +49-941-943 4720\\                FAX  : +49-941-943 2305\\
email: na.hhomeier@na-net.ornl.gov\\
WWW: http://rchs1.uni-regensburg.de/\%7Ec5008/ 
}

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%\Ausland{} % Please give the name of the foreign association.
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\end{dpgabstract}

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