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Which one of the following techniques relies on the spin angular momentum of a photon?
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- CD spectroscopy
- Fluorescence spectroscopy
- IR spectroscopy
- Raman spectroscopy
Correct Option: A
Circular dichroism (CD) is dichroism involving circularly polarized light, i.e., the differential absorption of left- and right-handed light. Left-hand circular (LHC) and right-hand circular (RHC) polarized light represent two possible spin angular momentum states for a photon, and so circular dichroism is also referred to as dichroism for spin angular momentum.
