1. Institute of Crystallography; Russian Academy of Sciences; Leninsky Prospect 59 119333 Moscow Russia
2. Institute of Crystallography; University of Cologne; Greinstr. 6 50939 Köln Germany
3. Institute of Optics and Atomic Physics; Technical University of Berlin; Straße des 17. Juni 135 10623 Berlin Germany
4. Institute of Geology and Mineralogy; University of Cologne; Greinstr. 4-6 50939 Köln Germany
5. II. Institute of Physics; University of Cologne; Zülpicher Str. 77 50937 Köln Germany
6. Institute for Laser Science; University of Electro-Communications; 182-8585 Tokyo Japan