Excited-state photophysics continuous excitation

Various photophysical techniques continue to be used in the study of polymers some particularly interesting work on electrically-conducting pol37mers has been described by Roth and Bleier, inter alia. The photophysics of thin films and colloidal systems, including micelles, continues to be an important and active field of research see e.g. Kalyansundaram Debe. Cyclodextrins have been found to increase the chemiluminescence yields from aqueous peroxyoxalates by up to 300-fold (Woolf and Grayeski). Enzymegenerated excited states of acetone have been found to induce quasi-photochemical behaviour of riboflavin in the dark (Rojas and Silva). From studies of the luminescence of Schmidt and... 

We turn firstly to some of the more interesting developments in the photophysical field. Overlap and interaction between the organic and physical aspects of photochemistry has unfortunately continued to decline this year. Such overlap as remains is largely restricted to electron transfer processes. Apart from this area, studies of photophysical processes have mostly involved the virtually pure physics of excited states. In short, the physical and organic photochemists have increasingly been going their separate ways. The Reporters regret this development. 

The year under review has shown continual progress in elucidating the detailed behaviour of excited singlet and triplet states. This has been largely due to the improvement of experimental equipment especially in the very short time domains. The need for a complete understanding of photophysical processes in any application of excited-state properties is now fully accepted, particularly in analytical applications of luminescence and biochemistry. 

Yam and Lo (Chap. 2 ) focus on the photophysics of a broad family of supramolecular metal complex clusters derived from the group Ib transition metal ions (Cu, Ag, and Au). This chapter discusses basic types of excited states found in clusters that contain two, three, and four metal ions held together by ligands such as halide, phosphine, and acetylide. Continuing on this theme are S. W. Jones and cowoikers (Chap. 4), who outline the photophysical and electrochemi-... 

Phenolate. The photoionization of phenols and phenolates continues to be the subject of studies to understand the photophysics and photochemistry involved. This interest is related to the application of phenols as antioxidants in organic materials and polymers,as well as to the fact that phenols are important constituents of many biochemical systems," and that OH-bond dissociation of the aromatic amino acid tyrosine may play an important role in protein photodegradation. Essential questions in these studies are whether the photoionization is mono- or bi-photonic and what is the nature of the dissociative excited state. 

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