# How to obtain band dispersion from a band structure diagram?

Reading about bands dispersion, I came across the following (Computational Chemsitry of Solid State Materials):

The amount of covalent interaction looks small, which may be deduced from the,
likewise small, dispersion of the oxygen 2p bands which is less than 3 eV.


How is the dispersion obtained (in this case 3 eV) just by inspecting the band structure diagram?

• So from my understanding the dispersion of a band is another way of saying the bandwidth. Follow the band they refer to as the oxygen 2p band and see its maximum and minimum energy, the difference should be less than 3 eV. Mar 31, 2015 at 20:45
• Also, I think a better way of asking this so that it is more general would be, "How is the dispersion of an energy band related to the original atomic orbitals and their interactions?" This is more along the lines of garyp's answer, which is deserving of a more general question. Mar 31, 2015 at 20:47