[1] Univ Nijmegen, NSR Ctr, Inst Theoret Chem, NL-6525 ED Nijmegen, Netherlands
[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[3] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[4] Univ Warsaw, Dept Chem, Quantum Chem Lab, PL-02093 Warsaw, Poland