Anomalous diffusion-limited reaction kinetics of a phototrapping reaction

Conference Paper

A focused laser beam acts as both a `phototrap', bleaching fluorophore molecules which diffuse into the beam path, and as a confocal probe, detecting the excited, unbleached fluorophore molecules still present in the trap. With this focused laser beam, we observe anomalous asymptotic rate laws similar to those predicted for a diffusion-controlled elementary trapping reaction, A+T→T, in one and two dimensions. One dimensional diffusion-limited trapping kinetics are approached in capillaries with 10 μm diameters while two dimensional diffusion limited trapping kinetics are observed with unstirred samples having a quasi 2-D geometry. In the presence of stirring, the 2-D samples exhibit the classical, constant trapping rate over time.

Duke Authors

Cited Authors

  • Monson, E; Lin, AL; Kopelman, R

Published Date

  • January 1, 1997

Published In

Volume / Issue

  • 464 /

Start / End Page

  • 257 - 262

International Standard Serial Number (ISSN)

  • 0272-9172

Citation Source

  • Scopus