Question
This phenomenon is represented by an arrow angled down and left on a Jablonski diagram. For 10 points each:
[10m] Name this phenomenon often used in glow-in-the-dark paint, which is caused by a triplet to singlet state transition.
ANSWER: phosphorescence [prompt on luminescence]
[10e] Singlet and triplet states are defined as having different values of this quantity, meaning many selection rules will forbid a transition. Electrons can have “up” or “down” values of this quantum number.
ANSWER: spin [or intrinsic angular momentum; accept spin-forbidden transition; prompt on angular momentum; reject “orbital angular momentum”]
[10h] A transition from a triplet to singlet state is an example of this more general type of forbidden transition, where there is an electronic transition between two states with different spin multiplicity.
ANSWER: intersystem crossing [or ISC]
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