a.The lattice and its unit in 1D: T=ma(m=0,±1，±2，.…） 5 )⊙⊙ ⊙ ,· ● Figure 1.13 A one-dimensional lattice. unit cell and its choice for one-dimensional lattice One dimensional latticea. The lattice and its unit in 1D: T = ma (m = 0, ±1, ± 2，…) unit cell and its choice for one-dimensional lattice One dimensional lattice