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Update M2L10zg.txt #41

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8 changes: 4 additions & 4 deletions M2L10zg.txt
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Expand Up @@ -16,7 +16,7 @@ and its magnitude is epsilon, and we
want to ask, what is the electrostatic energy
in this electric field?
And we're using the fact that electrostatic energy
can be expended in a multipole expansion.
can be expanded in a multipole expansion.
We have a monopole term, we have a dipole term,
and we have a quadratic term.
So the charge, of course, is the atom
Expand All @@ -43,8 +43,8 @@ the dipole operator and its projection on the z-axis.
So the dipole operator is the charge
of the electron times the position,
and as long as the polarizability
in this situation is isotropic-- the [INAUDIBLE] is a minus
sign, minus e is a charge.
in this situation is isotropic-- did I forget -- yes, a minus
sign, minus e is the charge.
If you apply an electric field in the Z direction,
all the relevant dipole moments are in the Z direction.
For anisotropic materials, you could
Expand All @@ -63,4 +63,4 @@ have degenerate energy levels.
If n is a non-degenerate level, this matrix element
is 0 by the parity selection rule.
Now we want to do perturbation theory,
so our perturbation operator is this.
so our perturbation operator is this.