Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 111, Issue 1, Pages 135-145Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-012-7481-6
Keywords
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Funding
- US National Science Foundation [CHE-0832298, CHE-1112433, DMR-0619759]
- National Science Foundation [DMR-0537588]
- University of Wisconsin-Milwaukee
- University of Wisconsin-Madison
- Research Growth Initiative of the University of Wisconsin-Milwaukee
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1112433] Funding Source: National Science Foundation
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IRENI (infrared environmental imaging) is a recently commissioned Fourier transform infrared (FTIR) chemical imaging beamline at the Synchrotron Radiation Center in Madison, WI, USA. This novel beamline extracts 320 mrad of radiation, horizontally, from one bending magnet. The optical transport separates and recombines the beam into 12 parallel collimated beams to illuminate a commercial FTIR microspectrometer (Bruker Hyperion 3000) equipped with a focal plane array detector where single pixels in the detector image a projected sample area of either 0.54x0.54 mu m(2) or 2x2 mu m(2), depending in the measurement geometry. The 12 beams are partially overlapped and defocused, similar to wide-field microscopy, homogeneously illuminating a relatively large sample area compared to single-beam arrangements. Both transmission and reflection geometries are used to examine a model cross section from a layered polymer material. The compromises for sample preparation and measurement strategies are discussed, and the chemical composition and spatial definition of the layers are distinguished in chemical images generated from data sets. Deconvolution methods that may allow more detailed data analysis are also discussed.
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