The research reported here in summary form was conducted under the auspices of Weapons-Supporting Research (WSR) and Institutional Research and Development (IR D). The period covered is the first half of FY90. The results reported here are for work in progress; thus, they may be preliminary, fragmentary, or incomplete. Research in the following areas are briefly described: energetic materials, tritium, high-Tc superconductors, interfaces, adhesion, bonding, fundamental aspects of metal processing, plutonium, synchrotron-radiation-based materials science, photocatalysis on doped aerogels, laser-induced chemistry, laser-produced molecular plasmas, chemistry of defects, dta equipment development, electronic structure study of the thermodynamic and mechanical properties of Al-Li Alloys, and the structure-property link in sub-nanometer materials.

Florida State University is investigating the concept of pulsed electron beams for fly ash precipitation. This report describes the results and data on three of the subtasks of this project and preliminary work only on the remaining five subtasks. Described are the modification of precharger for pulsed and DC energization of anode; installation of the Q/A measurement system; and modification and installation of pulsed power supply to provide both pulsed and DC energization of the anode. The other tasks include: measurement of the removal efficiency for monodisperse simulated fly ash particles; measurement of particle charge; optimization of pulse energization schedule for maximum removal efficiency; practical assessment of results; and measurement of the removal efficiency for polydisperse test particles. 15 figs., 1 tab. (CK)

1,1'-Diruthenocenylnaphthalene has been prepared and its molecular structure has been determined by x-ray diffraction, in order to compare its structure with that of its iron analog. The molecular structure of the half oxidized form of 1,1'-diferocenylnaphthalene has also be determined. Comparison of these structures has made it possible to assign the origins of observed deformations in these substances. Polymeric, face-to-face metallocenes related to the 1,8-dimetallocenylnaphthalenes (M=Fe, Ru) have also been prepared by coupling of 1,1'-bis(chlorozinc)metallocenes with 1,8- diiodonaphthalene. A more general approach to the synthesis of polymeric face-to-face metallocenes incorporating other transition metals has been developed. This involves the sequential replacement of iodo groups in 1,8-diiodonaphthalene with cyclopentadiene and the complexation of these rings with metals. A short synthesis of 4-n-butyl-1,8-diiodonaphthalene has been achieved. The molecular structure of a 2,3-oligomeric face-to-face ferrocene has been determined and shown to have the unexpected cis arrangement of naphthalene rings. 6 refs.

The Physics Section vacuum deposition system is available for several types of thin film techniques. This vacuum evaporation system operates in the high vacuum range. The evaporation source is a resistive heating element, either a boat or a filament design. Coating is then line of sight from the source. Substrates to be coated can have a maximum diameter of 17 inches. At this time the variations in the thickness of the coatings can be controlled, by monitor, to within about 100 angstroms. The system diagrams follow the Operation Procedures and the Sample Coating Procedures provided in this document. 3 figs.