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Electron- and Photo-Induced Processes for Molecular Energy Conversion (EPIP) Group

The EPIP program, supported by the DOE Office of Science Chemical Sciences, Geosciences and Biosciences Division, applies both photoexcitation and ionization by short pulses of fast electrons to investigate fundamental chemical problems relevant to the production and efficient use of energy and thus obtain unique insights not attainable with other techniques. These studies may play an important role in the development of safer, more effective, and environmentally beneficial processes for the chemical conversion of solar energy and advanced nuclear fuel cycles.

One set of problems concerns processes occurring on very short time scales, including time-dependent yields, properties, geminate recombination, and reactivity of primary radiation products in non-aqueous polar solvents and ionic liquids. A second examines the fundamental science of charges and excited states in conjugated polymers and ionic liquids. Work on conjugated polymers indicates that these molecules can transport charges rapidly over very long distances: the molecules might be called semiconducting "molecular wires." A third set deals with reactivity of molecular and radical transients, where pulse radiolysis provides the most convenient or the only method to rapidly generate these species. Work in this area includes the reactivity of environmentally and biologically important nitrogen-oxygen species whose chemistry is poorly understood, proton and hydrogen atom transfer reactions that relate to solar fuel generation.

This program includes the Accelerator Center for Energy Research (ACER), which develops and operates advanced instrumentation for the application of radiolysis techniques The principal tool for this research is the Laser Electron Accelerator Facility (LEAF), which combines short pulses of electrons and laser light to produce, excite, and examine transient species with high time resolution. ACER also includes the 2 MeV electron Van de Graaff, which is a sensitive and adaptable instrument for radiolytic kinetics work on longer time scales, and a 60Co source that is used for competition kinetics and product studies.

Last Modified: 5 May 2014
Questions and Comments to: Jim Wishart Chemistry Department, Brookhaven National Lab, Upton, L.I., NY 11973-5000