The Commission continued to promote the study of electron-density distributions in both real and momentum space by bringing together physicists, chemists and crystallographers in conferences, workshops and schools, and by initiating and carrying out projects.
With great sorrow, we learned of the passing away of our member J. Almlof in February 1996.
The Commission met during the Gordon Research Conference on Electron Distribution and Chemical Bonding in Plymouth, New Hampshire, USA, 2-7 July 1995. The topics discussed included the next Sagamore meeting in Saskatchewan, Canada, organized by B. Robertson. It was decided to use the same schedule as the Gordon Conference. It was also planned to have a tutorial workshop in the days before the conference. The conference proceedings would not be published. It was noted with great pleasure that the organizers of the Gordon Conference maintained contact with the Commission and involved its members in the discussion on the organization of the next Gordon Conference. K. Schwarz and C. Lecomte were selected as Chairman and Vice-Chairman.
The meeting was organized by N. Shiotani in Tokyo, Japan, 28-31 August 1995. 64 scientists from 12 countries attended the meeting with 44 invited talks. Synchrotron radiation has made it possible to use ultra-high momentum resolution (0.02 a.u.) and photon energies up to the electron rest energy can be employed. One of the objects of the fermiology project is to standardize procedures with Si as test case. The results of the various groups show significant differences, probably due to background contribution and multiple scattering. On the theoretical side, quite different methodologies - FLAPW and KKR - yield very similar results. Compton studies on different systems were extensively discussed. Other techniques such as positron annihilation, angle-resolved photoemission and electron Compton scattering contributed to obtain a robust picture of the underlying electronic structure. The next meeting will be hosted by Martin Blume in Brookhaven, USA, in Spring 1998.
The next Sagamore meeting will be organized by B. Robertson in Saskatchewan, Canada, 27 July- 1 August 1997.
1. Fermiology of High-Tc Superconductors via High-Resolution Synchrotron-based Compton Scattering. Owing to the recent arrival of new synchrotron sources and the alertness and initiative of our scientists, the project on fermiology and Compton scattering is thriving, as witnessed by the workshop in Tokyo. Active management by A. Bansil contributes to its success.
2. Density Matrix Project. Since progress seems to run in phase with the Sagamore meetings, new results are expected at the coming conference.
3. Multipole Refinement and Related Topics. A Chairman, C. Lecomte, has been appointed and a concept programme has been devised to make a concerted effort of assessing the various multipole programs in existence and in particular the new program XD that has been developed by T. Koritsanzky et al. under the auspices of the IUCr. The activities of the project will be carried out in close cooperation with those undertaken in the field of the Maximum Entropy Project.
4. Maximum Entropy Project. This topic has led to vigorous scientific discussions during the various conferences organized by the Commission. Recent results obtained by different groups show significant differences. The Chairman of the project, M. Sakata, has formulated the objects of the project and its operating procedures.
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