I am trying to get a better intuition on solid-state physics but I am a chemist by degree. I came across this article that attempts to bridge the gap between solid-state physics and molecular chemistry. However, I am unsure what the author is referring to when he says "a and an e combination". I believe it is talking about the symmetry of the pi orbitals but I really have no clue.

image regarding the excerpt I am referring to

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    $\begingroup$ A is symmetric with respect to the principal axis, e is degenerated. You may want to look at character tables. $\endgroup$ – Martin - マーチン Jun 30 at 2:13
  • $\begingroup$ Ah, thank you! Forgot about that! $\endgroup$ – Oscar Gonzalez Jun 30 at 2:35
  • $\begingroup$ They are called Mulliken symbols or Mullikan notation if you try read more about it. $\endgroup$ – Justanotherchemist Jun 30 at 8:55

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