Update 8_many_atoms.md

src/8_many_atoms.md

@@ -206,7 +206,7 @@ The spacing of the distorted chain alternates between two different distances an
 
 ![](figures/peierls_transition.svg)
 
-Due to the alternating hopping energies, we must treat two consecutive atoms as two different orbitals ($\left| n,1 \right>$ and $\left| n,2 \right>$ in the figure) from the same unit cell. The corresponding LCAO of this chain is given by $$\left|\Psi \right> = \sum_n \left( \phi_n \left| n,1 \right> + \psi_n \left| n,2 \right>\right).$$ As usual, we assume that all these atomic orbitals are orthogonal to each other.
+Due to the alternating hopping energies, we must treat two consecutive atoms as two different orbitals ($\left| n,1 \right>$ and $\left| n,2 \right>$ in the figure) from the same unit cell. The corresponding LCAO of this chain is given by $$\left|\Psi \right> = \sum_n \left( \phi_n \left| n,1 \right> + \psi_n \left| n,2 \right>\right)$$ As usual, we assume that all these atomic orbitals are orthogonal to each other.
 
 1. Indicate the length of the unit cell $a$ in the figure.
 2. Using the Schrödinger equation, write the equations of motion of the electrons.