Temperature dependence of proton diffusion in Ih ice

Anna Uritski, Itay Presiado, Yuval Erez, Rinat Gepshtein, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The temperature dependence of the proton diffusion constant, D H+, in methanol-doped ice was studied over the wide temperature range of 80-260 K. For that purpose, we measured the time-resolved fluorescence of a flavin mononucleotide (FMN) and riboflavin in ice doped with HCl or HF. The analysis of the fluorescence quenching provided the value of DH+. We found that the temperature dependence of D H+ at T > 235 K is rather small, whereas at T <235 K, it is rather large. These temperature-dependence results are similar to previous conductivity measurements. We used a stepwise, two-coordinate qualitative proton transfer model to explain the temperature dependence of DH+ in ice.

Original languageEnglish
Pages (from-to)10285-10296
Number of pages12
JournalJournal of Physical Chemistry C
Volume113
Issue number23
DOIs
StatePublished - 11 Jun 2009

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