We study the influence of Förster energy transfer on the vibrational relaxation dynamics of anionic hydration shells by performing time-resolved mid-infrared spectroscopy on the OH-stretch vibration of water molecules in aqueous solutions of sodium iodide. We observe that the Förster energy transfer leads to a pronounced acceleration of the vibrational relaxation. We describe the observed dynamics with a model in which we include the Förster vibrational energy transfer between the different hydroxyl groups in solution. With this model we can quantitatively describe the experimental data over a wide range of isotopic compositions and salt concentrations. Our results show that resonant energy transfer is an efficient mechanism assisting in the vibrational relaxation of anionic hydration shells.

AIP
dx.doi.org/10.1063/1.4816370
J. Chem. Phys.
Ultrafast Spectroscopy

Lotze, S, & Bakker, H.J. (2013). Influence of Förster-type energy transfer on the vibrational relaxation of anionic hydration shells. J. Chem. Phys., 139(Article number: 44505), 1–8. doi:10.1063/1.4816370