1. Physics Department, Institute for Energy Technology, P.O. Box 40, Kjeller,
N-2027 Norway
2. Department
of Imaging and Applied
Physics, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia
3. Department
of Physics, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
4. Swiss-Norwegian Beamline, European Synchrotron Radiation Facility, BP 220, Grenoble,
CEDEX, France
5. SINTEF, Materials and Chemistry, N-7465 Trondheim,
Norway