A 'quantum corral' of 60 Fe atoms assembled and viewed on Cu(001) by STM at 4 K. The tip imaging parameters are a) Vt = +10 mV and -10 mV, with current I = 1 nA (after Crommie et al. 1995, with permission).
Images in colour can be seen on the IBM web site for Don Eigler's group in Almaden, California.
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