Electronic transitions cause spectra if asymmetric electron-distribution changes cause transient dipole moments {allowed transition}. Then angular momentum change is +1 or -1. Radiation intensity depends on electronic transition probability. Electric dipoles give highest intensity, because they have allowed transitions.
Symmetric electron-distribution changes {forbidden transition} do not change angular momentum. Electric quadrupoles and magnetic dipoles give low intensity, because they have forbidden transitions.
5-Chemistry-Analytical Chemistry-Spectroscopy
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Date Modified: 2022.0225