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.
In symmetry terms, which of the following must be true for an allowed transition?
- AOnly the vibrational representations must be symmetric.
- BOnly the electronic representations must be symmetric.
- CSymmetry does not matter, as long as there is a change in dipole or polarizability.
- DBoth the electronic and vibrational representations must be asymmetric.
- EBoth the electronic and vibrational representations must be symmetric.
The chlorophyll molecule possesses a singlet ground state 1T. Which of the following is true?
- AEmission of light does not obey the Franck–Condon principle.
- BFluorescence occurs due to a transition.
- CPhosphorescence is a spin-forbidden transition.
- DPhosphorescence occurs over the same timescale as fluorescence.
- EFluorescence occurs due to a transition.