~ransients in the ring-rate changes, which take place when the temperature of a field-electron emitter is vaned, hav~ been observed for several cry~tal dire~tions on bec, fcc, and hcp crystals. It is proposed that th~se tra~sle.nts are the result .of changes III the size of small surface facets which are in turn related to amsotroples III the surface tenSlOn.
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