Progress on accurate measurement of the Planck constant: Watt balance and counting atoms <xref ref-type="fn" rid="cpb141896fn1">*</xref>

Progress on accurate measurement of the Planck constant: Watt balance and counting atoms *

Li Shi-Song^a),^b),^†, Zhang Zhong-Hua^b),^‡, Zhao Wei^a), Li Zheng-Kun^b), Huang Song-Ling^a)

Fig. 1. Lattice structure of the 28 Si crystal. 18 28 Si atoms are shown in the structure: 4 atoms red are inside the cube; 6 atoms yellow are at the centers of 6 surfaces; the other 8 atoms pink and green are at vertices of the cube. The average number of atoms in each lattice is N = 4+62+88 = 8.