Dowa Mining Co. Ltd

DOWA Mining Co., Ltd. Semiconductor Materials Croup, Tokyo, Shape of sample, shot, ingot, disk, rod for MBE. (J. S. Becker and H.J. Dietze, Int. j. Mass Spectrom., 228, 127 (2003). Reproduced by permission of Elsevier.)... 

The authors greatly thank the Akita Zinc Co., Ltd. and Dowa Mining Co., Ltd. for granting permission to publish this pqrer. The authors would also like to express their appreciation to Dr. Y. Umetsu, of Tohoku University, for his advice in preparing the manuscript. 

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