3 research outputs found
Transient x-ray absorption spectroscopy of hydrated halogen atom
Time-resolved x-ray absorption spectroscopy monitors the transient species
generated by one-photon detachment of an electron from aqueous bromide.
Hydrated bromine atoms with a lifetime of ca. 17 ns were observed, nearly half
of which react with excess Br- to form Br2-. The K-edge spectra of the Br atom
and Br2- anion exhibit distinctive resonant transitions that are absent for the
Br- precursor. The absorption spectra indicate that the solvent shell around a
Br0 atom is defined primarily by hydrophobic interactions, in agreement with a
Monte Carlo simulation of the solvent structure.Comment: 6 pages, 4 figures + supplement, will be submitted to PR
Transient x-ray absorption spectroscopy of hydrated halogen atom
This is the publisher's version, also available electronically from http://scitation.aip.org/content/aip/journal/jcp/128/6/10.1063/1.2827456.Time-resolved x-ray absorption spectroscopy has been used to observe the transient species generated by one-photon detachment of an electron from aqueous bromide. The K-edge spectrum of the short-lived Br(0) atom exhibits a resonant 1s-4p transition that is absent for the Br− precursor. The strong 1s-4p resonance suggests that there is very little charge transfer from the solvent to the open-shell atom, whereas weak oscillations above the absorption edge indicate that the solvent shell around a neutral Br(0) atom is defined primarily by hydrophobic interactions. These conclusions are in agreement with Monte Carlo and quantum chemical simulations of the solvent structure