Diffusion-assisted acid-base non-exponential dynamics in the short time domain

Boiko Cohen, Pavel Leiderman, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We measured the direct proton transfer between a photoacid, 8-hydroxypyrene-1,3,6-trisulfonate (HPTS), and a base, acetate anion, in water and water-glycerol mixtures. We used the pump-probe technique with ∼150 fs time resolution to excite the sample at 400nm and monitor the change in the sample transmittance as a function of both time and wavelength. We analyzed the experimental data using the irreversible diffusion-controlled Smoluchowski model. As the solution viscosity increases, from about 1 cP (neat water) to 10 cP, at 0.27 mole fraction of glycerol, the probe signal decay becomes longer and increasingly non-exponential.

Original languageEnglish
Pages (from-to)682-687
Number of pages6
JournalJournal of Luminescence
Issue numberSPEC
StatePublished - May 2003
EventProceedings of the 2002 International Conference on Luminescence - Budapest, Hungary
Duration: 24 Aug 200229 Aug 2002


  • Acid-base
  • Diffusion assisted reaction


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