Bulletin of the American Physical Society
2006 APS March Meeting
Monday–Friday, March 13–17, 2006; Baltimore, MD
Session D10: Focus Session: Physical Chemistry of Nanoscale System III
2:30 PM–5:30 PM,
Monday, March 13, 2006
Baltimore Convention Center Room: 302
Sponsoring Unit: DCP
Chair: Yiping Zhao, University of Georgia
Abstract ID: BAPS.2006.MAR.D10.5
Abstract: D10.00005 : Probe single cyanine dye molecules' photo isomerization.
4:06 PM–4:18 PM
Preview Abstract Abstract
(National Sun Yat-sen University)
Cyanine dyes are interested in the photosensitization, nonlinear optics, and their photophysical and photochemical behaviors. In particular, cyanine molecules, like DiI, plays an important role in single molecule fluorescence investigations. The high photo-stability, good QE, and low inter-system crossing rates, make it an good example for the single molecule investigations. We present the single molecule fluorescence investigation on the DiI molecules. In the investigation, we observe some (but not all) molecules exhibits reversible and quasi-stepwise polarization change. The decay dynamics is also changed correspondingly. Clear on-off blinking behaviors indicate the change in polarization from a single molecule, rather than the background noise, and we speculate it as the photo isomerization of the dye molecule. More detail analysis indicates some isomerization occurred at the singlet excited states, and it takes longer timescale ($>$ ms) than expected.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.D10.5
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