The explanation was motivated by the absence of axial screw dislocations in the whiskers ( which in themselves are a growth mechanism ), the requirement of the gold droplet for growth, and the presence of the droplet at the tip of the whisker during the entire growth process.
32.
Where surface relief can be resolved to the level of an atomic step, screw dislocations appear as distinctive spiral features thus revealing an important mechanism of crystal growth : where there is a surface step, atoms can more easily add to the crystal, and the surface step associated with a screw dislocation is never destroyed no matter how many atoms are added to it.
33.
Where surface relief can be resolved to the level of an atomic step, screw dislocations appear as distinctive spiral features thus revealing an important mechanism of crystal growth : where there is a surface step, atoms can more easily add to the crystal, and the surface step associated with a screw dislocation is never destroyed no matter how many atoms are added to it.
