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Acknowledgments

The author thanks Prof. J.M. Greenberg for inviting him as a lecturer to the International School of Space Chemistry on Cosmic Dust Connection, where the contents of this article were presented. He thanks A. Hashimoto and H. Ishioh for preparing figures. This work was partly supported by Grant-in-Aid (05833011) from the Ministry of Education, Science, and Culture of Japan.



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Mon Sep 16 16:23:29 JST 1996