These proceedings are the result of the third international workshop on Desorption Induced by Electronic Transitions, DIET III, which took place on Shelter Island, NY, May. 20-22, 1987. The work contained in this volume is an excellent summary of the current status of the field and should be a valuable reference text for both "seasoned" researchers and newcomers in the field of DIET. Based on the success of the meeting it seems clear that interest and enthusiasm in the field is strong. It is also apparent, from the many lively discussions during the meeting, that many unanswered questions (and controversies) remain to be solved. It was particularly pleasing to see many new participants from new and rapidly advancing fields, ranging from gas phase dynamics to semiconductor processing. The resulting cross-fertilization from these separate but related fields is playing an important role in helping us understand desorption processes at solid surfaces. In general, the topics covered during the course of the workshop over­ lapped those of both DIET I and DIET II. However, clear advances have been made and in general there is a much more sophisticated understand­ ing of the physics and chemistry of stimulated desorption. Of particular note in this regard is the gas phase research highlighted in this workshop by the work of Nenner et al. , where new results indicate that in the gas phase, photodissociation can precede or compete strongly with autoion­ ization and other electronic relaxation pathways.

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I Introductory Lecture.- Some Recent Developments in DIET.- II Gas Phase.- Photodissociation and Photoionization Processes of Core Excited Molecules: The CH3Br Case.- Auger Electron-Ion Coincidence Studies on Free Molecules.- Electron-Stimulated Desorption of Dn+ Clusters from Condensed Deuterium Layers on Pd(111) Between 5 and 20 K.- Desorption Processes in Planetary Science.- Atom Selective Photochemistry with Monochromatic Soft X-Rays.- III Neutrals and Negatives.- Photon Stimulated Desorption of Neutrals by Synchrotron Radiation from Chemisorbed, Physisorbed, and Condensed Layers.- Rovibrational Laser Spectroscopy of ESD Neutrals from Chemisorbed Species.- Electron Stimulated Desorption of Excited Hydrogen Atoms from an Alkali Promoted Surface.- Dissociative Attachment in ESD from Condensed Molecules.- Image Charge, Coherent Scattering, and Symmetry Effects in Electron Stimulated Desorption: O? from O2 Condensed on Metals.- Techniques for the Detection of Photodesorbed Negative Ions.- IV Electron Stimulated Desorption Ion Angular Distribution (ESDIAD).- Observation of Molecular Rotors on Surfaces by ESDIAD: Studies of PF3 and NH3 Chemisorption on Ni Surfaces.- The Influence of Surface Structure on Mechanisms of Stimulated Desorption.- DIET in the Second Layer: An ESDIAD Study of NH3 on a CO Layer on Ni(111) and Ni(110).- ESDIAD of Small Molecules on Surfaces: A Few Caveats.- An Ellipsoidal Mirror Analyzer for the Study of Photon Stimulated Desorption.- Digital Video Data Acquisition/Analysis for Existing ESDIAD Apparatus.- V Theory.- Dynamics in Neutral DIET from Chemisorbed Molecules.- The Nature of Repulsive States and the Role of Nuclear Dynamics in Desorption Induced by Electronic Transitions.- The Dynamics of O+ Desorption from TiO2.- DIET and the Electronic Structure of Chemisorbed Molecules and Physisorbed Rare Gases.- Theory of Desorption of Neutrals by Temporary Ionization of Physisorbed Species at Metal Surfaces.- The Magnitude of Secondary Electron Contributions in Photon Stimulated Desorption.- Interatomic Auger Rates for the Sodium Fluoride Crystal.- VI Spectroscopy.- Ultraviolet Surface Photochemistry and Charge Transfer.- Chemically Induced Desorption of Nickel Oxide and Carbide by 5-200eV C+ and O+ Ion Bombardment.- PSID SEXAFS Studies of Silicon Surface Chemistry.- Photon Stimulated Desorption from Oxidized Al(110).- Stimulated Desorption from CO Chemisorbed on Cr(110): Sensitivity to Bonding Changes.- Temperature-Dependent PSD of H+ from H2O/Si(111) (7×7).- Electronic Sputtering and Its Application to SIMS Analysis of Biomolecular Monolayers.- Limits of Applicability of the Popcorn Model for Desorption of Large Biomolecules by Fast Ion Impact.- Photon-Stimulated Desorption in High Electric Fields.- Observations of Photon-Induced Gas Desorption from Technological Materials Using Synchrotron Light.- VII Insulators.- The Origin of Positive Ions and Excited Neutrals in Electron Stimulated Desorption from Alkali Halides.- Ion Desorption Induced by Core Exciton States in MgO.- Studies of Sapphire Photoablation by Laser-Induced Fluorescence and Photothermal Deformation Measurement.- Multiphoton-Induced Desorption from BaF2(111).- PSD of Excited Hydrogen From KCl.- Ground-State and Excited Atom Production by Electron and Ion Bombardment of NaCl and CaF2.- Optical Radiation from Electron, Photon and Heavy Particle Bombardment of Lithium Fluoride and Lithium-Dosed Surfaces.- Long Lifetime of Bulk Luminescence Observed in Spectrosil Glasses Under Electron Bombardment.- Index of Contributors.