Fluorescence decay profiles of single DNA molecules complexed with ethidium bromides in polymer were measured by time-resolved confocal fluorescence microscopy. In contrast to other single-molecule fluorescence data reported previously, they all exhibit high nonexponentiality that can be analyzed by employing the stretched exponential function. The Kohlrausch β-τ K distributions for individual DNA-dye molecules and their physical significance are presented in the first time.
Bibliographical noteFunding Information:
K.J.B.L. and M.L. would like to acknowledge the support by the ABRL Project, Korea Science and Engineering Foundation (R14-2002-015-01001-0(2003)). D.-S.K. acknowledges the support by Mokwon Research Fund.