Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) The definition of photon indices and time interval used in the calculation of the likelihood function in Eq. (1). Red circles are acceptor photons and green donor photons. (b) Two-state kinetics model. (c) Four-state kinetics model including acceptor blinking. Subscripts b and d stand for the bright and dark states, respectively.
