Performance of the infrared microspectroscopy beamline at CAMD
- J. Bennett Johnston, Sr., Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, Louisiana 70806 (United States)
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 (11 700-400 cm{sup -1}). Effective beam spot size at sample position of the microscope was measured to be 35x12 {mu}m{sup 2} (FWHM). It was also determined that synchrotron radiation has substantial advantages over the conventional thermal source: {approx}30 times better intensity and {approx}100 times better S/N at aperture size of the microscope smaller than 15x15 {mu}m{sup 2}. This performance allows infrared spectroscopy analysis in a small area with a diffraction-limited spatial resolution.
- OSTI ID:
- 20644063
- Journal Information:
- Review of Scientific Instruments, Vol. 76, Issue 1; Other Information: DOI: 10.1063/1.1832455; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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