The papers in this volume were presented at the Second International Conference on Unconventional Photoactive Solids held at the R&D Center of BP America September 9-12, 1985. It was part of an on-going series of conferences with the main aim of stressing the Interrelationship of solid state physics and solid state chemistry. The choice of topics covered a broad range of light-Induced solid state phenomena with particular emphasis on novel materials and/or novel phenomena. Organic solids, in particular, were emphasized as they are a natural meeting point of solid state physics and chemistry. A general trend In solid state physics Is to more complex materials (e.g. nonequilibrium glassy films, complicated unit cells, extended molecular building blocks, etc.). This trend necessitates the closer interaction between physicists and chemists. This conference reflects this trend quite dramatically. It is a new grouping together of a mix of materials, people and experimental approaches. A typical new theme pulling together this new mix can be seen in Part I. Fractals in Disordered Media. A variety of disordered media give rise to unusual temporal patterns of diffusion and reactions. The more familiar spatial patterns of self-similarity are discussed in the first article by M.F. Barnsley. Another topic pulling together a diverse group of scientists is covered in Part II. Spectral Hole-Burning. A number of leaders in this field are represented In these three papers.

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Section I: Fractals in Disordered Media.- Fractal Image Encoding.- Transport and Reactions in Disordered Media.- Fractal-Like Exciton Kinetics in Porous Glasses, Membranes and Powders.- Reaction Kinetics on Fractal and Euclidean Structures with Energetic Disorder: Random Walk Simulations.- Section II: Spectral Hole-Burning.- Dynamical Hole-Burning Requirements for Frequency Domain Optical Storage.- Zero-Phonon Lines, Photoburning of Spectral Holes, Information Storage, Photon Echo and Solid Systems.- Evolution of Spectral Holes on Logarithmic Time Scales.- Section III: Exciton Transport: Experiment and Theory.- Exciton Transport in Naphthalene-Doped Poly (Methylmeth-acrylate): Spatial and Energetic Disorder.- Excitation Transport Kinetics in Vapor Deposited Naphthalene.- Response of an Insulating Material to Photoexcitation.- Exciton Transport in Mixed Crystals: Quantum Percolation.- Section IV: Electron Transfer in Disordered Media.- On Electron Transfer Reactions in Disordered Media.- Time-Resolved Dielectric Loss as a Probe of Interfacial Electron Transfer Dynamics.- Section V: Energy Transfer in Organic Solids.- Charge Transfer in Polypyrrole and Electrochromism of Prussian Blue.- Energy Transfer in Doped Polymer Films.- Vibrational Dynamics of Hydrogen Bonded Solids: Phonons and Optical Damage.- Section VI: Silica Glasses.- An Integrated Fractal Analysis of Silica: Electronic Energy Transfer, Small-Angle X-Ray-Scattering and Adsorption.- Structural Changes and Oscillations During the Sol-Gel Transition in Silica Gel Glass as Probed by Pyrene Excimerization.- Organic Molecule, 1,4-Dihydroxy-9, 10-Anthraquinone, Doped Amorphous Silica Prepared by Sol-Gel Method and its Structures Studied by Photochemical Hole Burning.- Isolation and Trapping of Organic Photoactive Molecules in Silica Glass Matrices at Room Temperature.- Section VII: Carrier Dynamics in Amorphous Semiconductors.- Optical Modulation Spectroscopy of Native Defects in Amorphous Semiconducting and Conducting Polymers.- Microstripline Transient Photocurrents: A Probe of Carrier Thermalization and Band-Tail Densities in Amorphous Semiconductors.- Picosecond Decay of Photoinduced Absorption in Hydro-genated Amorphous Silicon.- Picosecond Transient Grating Experiments on Hydrogenated Amorphous Silicon: A Model for Surface Quenching.- Section VIII: Devices and Applications.- Langmuir-Blodgett Electronic Devices.- High-Resolution Photorefractive Polymers for Integrated Optics.- Solar Energy Conversion by Means of Parametric Mechanisms.- Author Index.