Internal conversion in large molecules

In this paper we consider the problem of internal conversion in a highly excited singlet state of a large molecule in the statistical limit in terms of a consecutive decay problem. The Wigner-Weisskopf approximation was utilized to handle the problem of sequential decay. We have elucidated the features of the radiative decay, such as the decay pattern, the decay times and the quantum yields of a 'statistical' second-excited singlet state in different spectral regions.