Transient x-ray absorption spectroscopy of hydrated halogen atom

摘要

Time-resolved x-ray absorption spectroscopy monitors the transient speciesgenerated by one-photon detachment of an electron from aqueous bromide.Hydrated bromine atoms with a lifetime of ca. 17 ns were observed, nearly halfof which react with excess Br- to form Br2-. The K-edge spectra of the Br atomand Br2- anion exhibit distinctive resonant transitions that are absent for theBr- precursor. The absorption spectra indicate that the solvent shell around aBr0 atom is defined primarily by hydrophobic interactions, in agreement with aMonte Carlo simulation of the solvent structure.