XXIIIrd International Congress of Pure and Applied Chemistry, Volume 7 contains the lectures presented at the 23rd International Congress of Pure and Applied Chemistry, held at Boston, USA in July 1971. This volume is organized into two parts. The first part presents papers discussing structure determination by the use of spectroscopy. Topics covered under this section include ion cyclotron resonance, some aspects of photoelectron spectroscopy, and the LASER-Raman spectroscopy of biological macromolecules. The second part provides the advances in conformational analysis. This section considers the study of small model molecules by NMR, the conformational analysis of polymers and their model compounds using spectroscopy, X-ray diffraction and energy calculations, and the theoretical and experimental studies which are being carried out to determine the factors which affect the folding of polypeptide chains in proteins. Chemists will find this text highly invaluable and insightful.