Blinking of single molecules in various environments

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Abstract
The fluorescence intermittency of various dye molecules in different environments was studied by wide-field fluorescence microscopy. The present work focuses on the analysis of long dark periods that are not due to triplet states. It is shown that the distributions of the length of dark periods follow power laws for all systems studied here. Furthermore, blinking kinetics is strongly influenced by the gas atmosphere to which the molecules are exposed. The presence of oxygen is of crucial importance.