dorsal/arxiv
View SchemaUltrafast Pulse Radiolysis Using a Terawatt Laser Wakefield Accelerator
| Authors | Dmitri A. Oulianov, Robert A. Crowell, David J. Gosztola, Ilya A. Shkrob, Oleg J. Korovyanko, Roberto C. Rey-de-Castro |
|---|---|
| Categories | |
| ArXiv ID | physics/0608106 |
| URL | https://arxiv.org/abs/physics/0608106 |
| DOI | 10.1063/1.2696204 |
Abstract
We report the first ultrafast pulse radiolysis transient absorption spectroscopy measurements from the Terawatt Ultrafast High Field Facility (TUHFF) at Argonne National Laboratory. TUHFF houses a 20 TW Ti:sapphire laser system that generates 2.5 nC sub-picosecond pulses of multi-MeV electrons at 10 Hz using laser wakefield acceleration. The system has been specifically optimized for kinetic measurements in a pump-probe fashion. This requires averaging over many shots which necessitates stable, reliable generation of electron pulses. The latter were used to generate excess electrons in pulse radiolysis of liquid water and concentrated solutions of perchloric acid. The hydronium ions in the acidic solutions react with the hydrated electrons resulting in the rapid decay of the transient absorbance at 800 nm on the picosecond time scale. Time resolution of a few picoseconds has been demonstrated. The current time resolution is determined primarily by the physical dimensions of the sample and the detection sensitivity. Subpicosecond time resolution can be achieved by using thinner samples, more sensitive detection techniques and improved electron beam quality.
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"abstract": "We report the first ultrafast pulse radiolysis transient absorption\nspectroscopy measurements from the Terawatt Ultrafast High Field Facility\n(TUHFF) at Argonne National Laboratory. TUHFF houses a 20 TW Ti:sapphire laser\nsystem that generates 2.5 nC sub-picosecond pulses of multi-MeV electrons at 10\nHz using laser wakefield acceleration. The system has been specifically\noptimized for kinetic measurements in a pump-probe fashion. This requires\naveraging over many shots which necessitates stable, reliable generation of\nelectron pulses. The latter were used to generate excess electrons in pulse\nradiolysis of liquid water and concentrated solutions of perchloric acid. The\nhydronium ions in the acidic solutions react with the hydrated electrons\nresulting in the rapid decay of the transient absorbance at 800 nm on the\npicosecond time scale. Time resolution of a few picoseconds has been\ndemonstrated. The current time resolution is determined primarily by the\nphysical dimensions of the sample and the detection sensitivity. Subpicosecond\ntime resolution can be achieved by using thinner samples, more sensitive\ndetection techniques and improved electron beam quality.",
"arxiv_id": "physics/0608106",
"authors": [
"Dmitri A. Oulianov",
"Robert A. Crowell",
"David J. Gosztola",
"Ilya A. Shkrob",
"Oleg J. Korovyanko",
"Roberto C. Rey-de-Castro"
],
"categories": [
"physics.ed-ph",
"physics.plasm-ph"
],
"doi": "10.1063/1.2696204",
"title": "Ultrafast Pulse Radiolysis Using a Terawatt Laser Wakefield Accelerator",
"url": "https://arxiv.org/abs/physics/0608106"
},
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