STRUCTURE DETERMINATION OF ORGANIC MICROCRYSTAL. Yasuyuki Takenaka, Hokkaido University of Education, Hakodate; Hachiman 1- 2, Hakodate, Hokkaido 040, Japan, Kiyoaki Tanaka and Wakatsu Nagai, Nagoya Institute of Technology; Gokiso, Nagoya 466, Japan, Masaya Uchida, Noboru Suda, and Kazumasa Ohsumi, Photon Factory, National Laboratory for High Energy Physics; Oho 1-1, Tsukuba, Ibaraki 305, Japan

Structure analysis of organic micro-crystal (120x20x20 um) has been attempted by equi-inclination Weissenberg method with Imaging Plate using synchrotron radiation at BL-4B of Photon Factory in Japan. The equipment was kept in vacuo during data collection. The specimen was a long life time phosphorescent substance in room temperature. The structure analysis is in progress. Data processing for Weissenberg photograph will be also discussed. Crystal data; P -4 21 c (No. 114), a = b = 20.19 Å, c = 7.70 Å, [[alpha]]=ß=[[gamma]]= 90, V = 3139 Å₃, [[lambda]]= 1.198 Å, 1114 reflexions of which 283 independent, -12 <= h <= 18, -11 <= k <= 19, 0 <= l <= 5.