IFF Scientists on leave 1999
| Dr. I. Cabria Alvaro | University Munich, Germany |
| Dr. W. Caliebe | HASYLAB at DESY, Hamburg, Germany |
| Dr. G. Goerigk | HASYLAB at DESY, Hamburg, Germany |
| Dr. D. Hupfeld | APS Argonne, USA |
| Dr. R. Lässer | Forschungszentrum Karlsruhe, Germany |
| Dr. M. Ohl | ILL Grenoble, France |
| Dr. W. Schmidt | ILL Grenoble, France |
| Dr. A. Scholl | Lawrence Berkeley Laboratory, USA |
| Dr. G. Schütz | University Essen, Germany |
| Dr. O. Seeck | HASYLAB at DESY, Hamburg, Germany |
| Dr. J. Stellbrink | University of Edinburgh, UK |