Radiation and Photochemistry

Radiation and Photochemistry

Subtask 1. Reactive Intermediates in High-Energy Chemistry

Purpose

Radiation chemistry provides a unique platform from which to
study a wide range of physiochemical processes. The research
proposed in this subtask aims to study fundamental processes
that occur in aqueous systems that are not only of interest to the
field of radiation chemistry, but to the chemical physics community
in general. The specific objectives of this subtask are to study
(i) the mechanisms by which the tremendous amount of energy
that is deposited into the spur dissipate and influence the chemistry
of pre-thermalized species, (ii) the role of water structure and
dynamics and chemical reactions, (iii) the nature and reactivity of
highly excited electronic states of water, and (iv) understand how
these dynamical processes influence the chemistry of pre-thermalized
and thermalized species. This subtask will utilize the new unique
capabilities that have been recently developed at the TUHFF LWA
and the Advanced Photon Source in conjunction with our well
established ultrafast laser and LINAC facilities to probe the initial
processes in spur evolution in both liquid and solid water. Time
resolved x-ray absorption studies of hydration structure around
short-lived reaction intermediates using synchrotron light (and, in
the future, x-rays generated at THUFF LWA) are proposed.
Femtosecond laser studies of ionization dynamics in liquid water
and concentrated aqueous solutions will be complemented by
laser and picosecond pulse radiolysis studies of pre-thermalized
and trapped species in hexagonal and amorphous ice and frozen
water in microheterogeneous systems..

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Radiation and Photochemistry

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