Multiple-acceptor FRET efficiency
= Multiple-acceptor FRET efficiency
{title2=$E_n=nE/[1+(n-1)E]$}
For n identical independent available <FRET acceptors>, transfer rates add. With single-pair <FRET efficiency> E, the donor exit probability is $E_n=nE/[1+(n-1)E]$. It is not nE; competition with the donor's other decay routes must be retained.