試題詳解

74. 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 about these three pathways below is wrong?
(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* and energy is transferred from M* to Q: 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.