Chemistry Department Seminar
"The Role Of Solvation And Interfaces In Radiation Chemistry"
Presented by Robert Crowell, Brookhaven National Laboratory
Thursday, March 28, 2013, 11 am
Room 300, Chemistry Bldg. 555
Hosted by: John Miller
In the context of new sustainable energy sources quest, the nuclear energy remains a key solution. However, with the development of nuclear technology, problems relating to nuclear waste disposal and the behaviour of materials under extreme conditions arise; thus, the radiation chemistry, with an emphasis on the understanding of the fundamental processes associated with the interaction of ionizing radiation within bulk liquids, the liquid/solid and solid/solid interface, is extremely important with respect to matters related to long time storage of nuclear waste. A further/complete understanding of the radiolytic process requires knowledge of the role of the solvent, the interface and nano-confinement on charge recombination, electron transfer and ion-radical chemistry. In this respect, we have used transient X-ray and optical absorption spectroscopy to study the hydration and dynamics of these short-lived species ��" the bromine atom and hydrated electron in some bromide containing imidazolium salts. Using the laser pump x-ray probe capabilities of XOR beamline 7-ID at the Argonne Advanced Photon Source, new experimental evidence for the behavior of hydrated bromine radicals has been found. The evolution of the hydrated electron under confinement was studied on a nanosecond time scale using pulsed radiolysis at the Laser Electron Accelerator Facility at BNL. These new insights and the understanding of the basic processes that control these reactions could open up studies of other inorganic species of relevance for design of nuclear reactors, radioactive waste management, radiation therapy, polymer processing, and planetary- and astrophysics.