Selection rules for electronic transitions pdf files

Selection rules for electronic spectra of transition metal complexes. Selection rules of electronic transitions electronic transitions may be allowed or forbidden transitions, as reflected by appearance of an intense or weak band according to the magnitude of. Selection rules for electron transitions ak lectures. Exam iii 2 selection rules for electronic transitions laporte selection. Exam iii 2 selection rules for electronic transitions 1. The first rule says that allowed transitions must involve the promotion of electrons without a change in their spin. Electronic spectroscopy application of group theory. Most of the material presented in this chapter is taken from bunker and jensen 2005, chap. To see a symmetrybased analysis of the parity selection rule laporte selection rule, go. Selection rules less simple than for rotations and vibrations a. It is all about sigma band, pai bond, nonbonding electrons bonding molecular orbital bmo antibonding molecular orbital abmo allowed transition. Many states, not all transitions seen selection rules plus each has own vibration energies.

Selection rules have been divided into the electronic selection rules, vibrational selection rules including franckcondon principle and vibronic coupling, and rotational selection rules. A selection rule describes how the probability of transitioning from one level to another cannot be zero. A gross selection rule illustrates characteristic requirements for atoms. The selection rules governing transitions between electronic energy levels of transition metal complexes are.