Worksheet: Selection Rules in Electronic Transitions

In this worksheet, we will practice using term symbols and selection rules to predict favored electronic transitions in atoms and molecules.

Q1:

In symmetry terms, which of the following must be true for an allowed transition?

  • AOnly the electronic representations must be symmetric.
  • BBoth the electronic and vibrational representations must be asymmetric.
  • COnly the vibrational representations must be symmetric.
  • DBoth the electronic and vibrational representations must be symmetric.
  • ESymmetry does not matter, as long as there is a change in dipole or polarizability.

Q2:

Which of the following would be a spin allowed transition?

  • A 5E 2E
  • B 3T1 1T1
  • C 1A2 3A2
  • D 3T1 3A2
  • E 4T2 2T4

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