1. Theoretical study of three-body nonadditive interactions for the H₂S-(H₂O)₂ system

   • Octavio Novaro
   • Andrej Leś
   • Guillermo del Conde

   Original Investigations Pages: 65 - 81

2. Spin-orbit electronic states of octahedral Pt-group d ⁶ complexes as derived from reflectance spectra and ligand field calculations

   • Gerd Eyring
   • Thomas Schönherr
   • Hans -Herbert Schmidtke

   Original Investigations Pages: 83 - 96

3. Potential energy calculations for the double internal rotation in acetone and dimethylamine

   • Yves G. Smeyers
   • Antonio Huertas-Cabrera
   • Sandor Suhai

   Original Investigations Pages: 97 - 105

4. Localization of the filled and virtual orbitals in the nucleotide bases

   • J. Cizek
   • W. Förner
   • J. Ladik

   Original Investigations Pages: 107 - 116

5. A theoretical study on the acid catalysed hydration of excited state acetylene

   • Peter S. Martin
   • Keith Yates
   • Imre G. Csizmadia

   Original Investigations Pages: 117 - 126

6. The hydrogen molecule ion in the old quantum theory

   • Ralph G. Pearson

   Original Investigations Pages: 127 - 136

7. The electronic structure of the first-row transition-metal diborides

   • David R. Armstrong

   Original Investigations Pages: 137 - 152