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Synchrotron-Based Infrared Spectral Imaging at the MIRIAM Beamline of Diamond Light Source

DOI: 10.1080/08940886.2017.1338416 DOI Help

Authors: Gianfelice Cinque (Diamond Light Source) , Mark D. Frogley (Diamond Light Source) , Katia Wehbe (Diamond Light Source) , T.-n. Que Nguyen (Diamond Light Source) , Ann Fitzpatrick (Diamond Light Source) , Chris S. Kelley (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Synchrotron Radiation News , VOL 30 , PAGES 11 - 16

State: Published (Approved)
Published: August 2017

Open Access Open Access

Abstract: Infrared (IR) spectral imaging is a quantitative scientific technique for measuring both the molecular composition and its spatial distribution across large areas of materials. Synchrotron radiation (SR) enhances IR imaging with a broad spectral bandwidth unobtainable with a conventional laboratory source or laser (covering 10000 to 5 cm-1), while the high collimation and small size of the SRIR source provide a diffraction-limited microbeam. The use of a few micron-sized aperture for IR imaging has a clear advantage in SR in terms of spectral quality, due to the high spectral flux reaching microspots of the sample even at the lowest wavenumbers. In this article, we present IR imaging examples developed mostly in collaboration with the user community and the staff of the IR beamline MIRIAM (Multimode InfraRed Imaging And Microspectroscopy) at Diamond Light Source [1 G. Cinque et al., Synchrotron Radiation News 24(5), 24–33 (2011). [Taylor & Francis Online], [Google Scholar] ]. The layout of the MIRIAM beamline (B22) is shown in Figure 1. Optically, this is composed of a UHV vacuum vessel including a two periscope system each with two metal mirrors, allowing refocusing and overcoming a midway shield wall (not shown). From the right, the bending magnet source illuminates a first flat mirror (with a horizontal slot rejecting X-rays) that reflects the SRIR fan onto an ellipsoidal mirror. The SRIR is focused midway and collected by another ellipsoidal mirror that redirects it down onto a double flat mirror; this can be translated laterally to send the focused SRIR to either of the two end stations (or part of the beam to both) through wedged diamond windows. The two experimental end stations are composed of Bruker Vertex 80V in-vacuum Fourier Transform IR (FTIR) interferometers with Hyperion 3000 IR microscopes. The IR detectors are broadband or high-sensitivity MCT (mercury cadmium telluride; 100 μm or 50 μm pitch) for point-by-point microscopy, and photovoltaic MCT focal plane array (FPA) 64 × 64 pixel detectors for full-field imaging.

Subject Areas: Technique Development, Physics

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy