Experiments on Cosmic Dust Analogues

Astrophysical analysis relating to solid matter requires data on properties and processes. Such data, however, expecially appropriate to space conditions are mostly lacking. It appeared then very tempting to gather together experimentalists, ob servers and theoreticians working in the field of cosmic dust and in related areas. The Workshop held in Capri (Italy) from September 8th till 12th 1987 gave the participants a unique opportunity for exchange of ideas and discussions of problems and experimental procedures. Introductory reports were prepared with the aim of giving the state of the art about single subjects; contributed poster papers presented, on the contrary, very recent results in the various fields. According to his specific interest each attendant has also contributed to three Working Groups respectively on a) carbon, b) silicates, c) ice and related topics. Scientifical and technical problems about these items were discussed in great detail. Though no definite answers were given, useful indications come out which will be of some help for future works. In addition to the scientific efforts, the Capodimonte Observatory and the Istituto Universitario Navale sought to give a warm welcome to the participants. Thanks to several sponsors, the LOC could organize some excursions and shows to entertain people during their spare time.

Proceedings of the Second International Workshop of the Astronomical Observatory of Capodimonte (OAC 2) held in Capri, Italy, September 8-12, 1987

Inhalt
Introductory Reports.- Comet Nucleus Sample Return Mission.- Initial Comet Simulation Experiments at DFVLR.- Methods and Difficulties in Laboratory Studies of Cosmic Dust Analogues.- Experiments on the Formation, Properties and Processing of Cosmic Dust.- Solid Carbon in Space.- PAHs, The State of Art.- Laboratory Production of Amorphous Silicates.- Ion Bombardment: Techniques, Materials and Applications.- The Structure and Dynamics of Amorphous Water Ice and Trapping of Gases in it.- Contributed Papers.- • Carbonaceous Materials.- A New Identifications of the 6.2, 7.7 and 8.5 µm Circumstellar Emission Features with Oxidized QCC.- On PAHs as Interstellar Grains: Infrared Absorption Coefficients.- Experimental Evidences for Hac and PAHs Soup in Space.- IR Spectroscopy of ACID Insoluble Residues of Carbonaceous Chondrites.- Light Standing-Waves in Aggregates of Amorphous Carbon Grains.- Hydrogenated Amorphous Carbon-Coated Silicate Particles: Diamond and Graphite-like Carbons and Interstellar Extinction.- Amorphous Carbon and Silicon Carbide Grains around Carbon Stars.- Grain Formation Experiments by a Plasma Jet Apparatus.- Determination of the U.V.-Visible Optical Properties of Submicronic Carbonaceous Particles at High Temperature from Scattering and Extinction Measurements.- • Silicatic Materials.- Experimental Studies of Circumstellar, Interstellar and Interplanetary Refractory Grains Analogs.- Optical Properties of Glassy Bronzite and the Interstellar Silicate Bands.- Piroxene Glasses Candidates for Interstellar Silicates.- Silicate Grains in Space: Laboratory Results.- Laboratory Studies of Extraterrestrial Chemistry Initiated by Atomic Silicon Ions in the Gas Phase.- Light Scattering from Simulated Interstellar Dust.- Laboratory Measurements of Light Scattering by Dust Particles.- • Ices.- Molecular Diffusions in Ices Implications for the Composition of Interstellar Grain Mantles and Comet Nuclei.- Formation of Particulates by Ion Bombardment of Cryogenic Ice Mixtures.- Some Consequences of Frozen Gas Irradiation by Energetic Ions.- HD and Co Release during MeV Ion Irradiation OF H2O/CD4 Frozen Mixtures AT 9 K.- • Observations and Models.- Studies of Absorption Features in the 3 µm Spectra of Highly Obscured Stellar and Protostellar Objects.- An Ionic Look at Interstellar Grain Mantles.- Infrared Properties of Interstellar Grains Derived from Iras Observations.- Interstellar Circular Polarization and the Dielectric Nature.- Size Distribution of Cometary Dust, Meteoroids and Zodiacal Grains.- A Zodiacal Dust Emission Model.- Reports of the Working Groups.- Report of the Working Group on Carbon.- Report of the Working Group on Silicates.- Report of the Working Group on Ice and Related Topics.- Index of Subjects.