Final answer:
Vibronically resolved spontaneous emission is temperature dependent and follows a distribution defined by the canonical density operator.
Step-by-step explanation:
Spontaneous emission is a process in which an excited atom or molecule emits a photon without any external excitation. When this process is vibronically resolved, it means that both the electronic and vibrational states of the molecule are taken into account.
The temperature dependence of vibronically resolved spontaneous emission follows a distribution defined by the canonical density operator. This distribution is similar to the Boltzmann distribution, which is used to describe the thermal equilibrium of a system.