Abstract
The first infrared (IR) beamline at the Center for Advanced Microstructures and Devices (CAMD) at Louisiana State University has been successfully constructed and commissioned. The beamline features a simple optical design with a minimal number of optical components. A pair of mirrors, planar and toroidal, is utilized for extracting synchrotron radiation (50 and 15 mrad, in horizontal and vertical directions, respectively) from the bending magnet port to a diamond window located outside of the shielding wall. Synchrotron radiation is then collimated by an off-axis parabolic mirror and fed into a Thermo Nicolet Continuum microscope through a Thermo Nicolet Nexus 670 FT-IR spectrometer. The microscope’s performances with synchrotron-radiation and conventional-thermal sources were compared in the mid-IR spectral range (11700–400cm−1). Effective beam spot size at sample position of the microscope was measured to be 35×12μm2 (FWHM). It was also determined that synchrotron radiation has substantial advantages over the conventional thermal source: ∼30 times better intensity and ∼100 times better S/N at aperture size of the microscope smaller than 15×15μm2. This performance allows infrared spectroscopy analysis in a small area with a diffraction-limited spatial resolution.
Published Version
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