Exercises 8.7: "Atomic" and molecular potentials

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R .

A . . . B .

8.7.1 Figure R gives the band structure for the molecular potential choice in "bloch". A and B are similar except either the lattice constant or the molecule separation has been changed relative to figure R.

A) For figure A), relative to R), which has been changed, the lattice constant or the molecule separation? Has the parameter been made larger or smaller?

B) For figure B), relative to R), which has been changed, the lattice constant or the molecule separation? Has the parameter been made larger or smaller?