Electric dipole transition moment
= Electric dipole transition moment
{title2=$\boldsymbol\mu_{fi}=\langle\psi_f|\hat{\boldsymbol\mu}|\psi_i\rangle$}
= Transition dipole moment
{synonym}
The <matrix element> of the <electric dipole moment> operator between two <quantum states>. Electric-dipole transition strength is proportional to its squared magnitude; <molecular symmetry> can force every Cartesian component to vanish.