When a Molecule Absorbs a Photon,the Molecule Is Promoted to an Excited

question 18

Multiple Choice

When a molecule absorbs a photon,the molecule is promoted to an excited state,M^*.The rate at which M^* is created is proportional to the concentration of M.There are three pathways that M^* may take to return to the ground state.Which statement below is INCORRECT for these three pathways.

• A)The rate at which the excited state returns to the ground state is independent of the pathway to the ground state and the concentration of excited state molecules.
• B)The three possible pathways to return to the ground state are emission,deactivation,and quenching.
• C)Quenching occurs when a second molecule,the quencher Q,collides with M^* to return M^* to the ground state.M^* + Q → M + Q^*
• D)Deactivation returns M^* to the ground state by colliding with other molecules and releasing energy in the form of heat.M^* → M + heat
• E)Emission returns M^* to the ground state by emitting a photon.M^* → M + hv.

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