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Development of nanosecond time-resolved infrared detection at the LEAF pulse radiolysis facility.
- Source :
-
The Review of scientific instruments [Rev Sci Instrum] 2015 Apr; Vol. 86 (4), pp. 044102. - Publication Year :
- 2015
-
Abstract
- When coupled with transient absorption spectroscopy, pulse radiolysis, which utilizes high-energy electron pulses from an accelerator, is a powerful tool for investigating the kinetics and thermodynamics of a wide range of radiation-induced redox and electron transfer processes. The majority of these investigations detect transient species in the UV, visible, or near-IR spectral regions. Unfortunately, the often-broad and featureless absorption bands in these regions can make the definitive identification of intermediates difficult. Time-resolved vibrational spectroscopy would offer much improved structural characterization, but has received only limited application in pulse radiolysis. In this paper, we describe in detail the development of a unique nanosecond time-resolved infrared (TRIR) detection capability for condensed-phase pulse radiolysis on a new beam line at the LEAF facility of Brookhaven National Laboratory. The system makes use of a suite of high-power, continuous wave external-cavity quantum cascade lasers as the IR probe source, with coverage from 2330 to 1051 cm(-1). The response time of the TRIR detection setup is ∼40 ns, with a typical sensitivity of ∼100 μOD after 4-8 signal averages using a dual-beam probe/reference normalization detection scheme. This new detection method has enabled mechanistic investigations of a range of radiation-induced chemical processes, some of which are highlighted here.
Details
- Language :
- English
- ISSN :
- 1089-7623
- Volume :
- 86
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- The Review of scientific instruments
- Publication Type :
- Academic Journal
- Accession number :
- 25933871
- Full Text :
- https://doi.org/10.1063/1.4918728