ACKNOWLEDGMENT

        This research was supported in part by the NASA Microgravity Science and Applications Division under Grant NAG8-1254. This work was carried out in part at the Ames Laboratory, which is operated for the U. S. Department of Energy by Iowa State University, under contract no. W-7405-Eng-82, supported by the director of Energy Research, Office of Basis Energy Sciences. Appreciation is expressed to Emrah Simsek for providing us with experimental results on nucleation ahead of the interface prior to their publication.

 

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