CONTENTS 



Preface ^ 



Additional Participants ^^ 



Introduction 1 



Niels Bohr 



I. MOLECULAR STRUCTURE AND EXCITED STATES 



Introductory Comments 7 



Albert Szent-Gyorgyi 

 Electronic Excited States of Simple Molecules 11 



G. Wilse Robinson 

 The Nature and Significance of n -» tt* Transitions ... 31 



Michael Kasha 



Discussion 64 



The Triplet State in Fluid Solution 69 



George Porter 

 Discussion 74 



II. EXCITED STATES OF MOLECULES OF 



BIOLOGICAL INTEREST 

 Introductory Comments 81 



James Franck 

 Excited States of Proteins 82 



G. Weber 



Discussion 105 



Spectra and Structure in Enzyme Complexes of 



Pyridine and Flavin Nucleotides 108 



Sidney F. Velick 



Discussion 142 



Interactions in Pyridine Nucleotides 144 



Sidney Shifri?i and Nathan O. Kaplan 

 On the Mechanism of the Dihydrothioctyl 



Dehydrogenase Reaction 157 



Robert L. Searls and D. R. Sanadi 

 Some Comments on Flavin and Flavoprotein Complexes 



and Semiquinones 163 



Helmut Beinert 



III. LIGHT EMISSION BY CHEMICAL REACTIONS 



Chemiluminescence in Porphyrin-Catalyzed Decomposition 



of Peroxides 173 



Henry Linschitz 



Vll 



