Indication of a very large proton diffusion in ice ih. 2. Fluorescence quenching of flavin mononucleotide by protons

Anna Uritski, Itay Presiado, Dan Huppert

Research output: Contribution to journalArticlepeer-review

Abstract

A time-resolved emission technique was employed to study the effect of excess protons on the fluorescence quenching process of flavin mononucleotide (FMN) in methanol-doped ice samples. We found that an excess of protons in ice has a very large effect on the fluorescence quenching whereas in liquid water the proton fluorescence quenching is rather small. We analyzed the experimental data using the Smoluchowski diffusion-assisted binary collision model. Under certain assumptions and approximations, the calculated proton diffusion constant in ice in the range of 245-265 K is about 10 times that of water at 295 K.

Original languageEnglish
Pages (from-to)18189-18200
Number of pages12
JournalJournal of Physical Chemistry C
Volume112
Issue number46
DOIs
StatePublished - 20 Nov 2008

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