Beamline Optical Layout
The synchrotron radiation is emitted from electrons traveling around the storage ring at nearly speed of light through a modified dipole chamber with opening-angle acceptance of 70H x 20V mrad^2 between a bending dipole magnet of SPS-I storage ring.
The beamline collects the infrared synchrotron emission from both edge radiation (ER) and bending magnet radiation (BM) of SPS-I. Behind the tunnel wall, The infrared beam is extracted in the horizontal plane laterally at 45° reflected from the first slotted flat mirror while the second and third mirrors are cylindrial shape for focusing the beam horizontally and vertically, respectively. The the forth mirror delivers the beam through the wall tunnel. After that, the M5 – M9 are responsible to collimate and split the beam to accommodate up to 3 branches. A matching optical box is used to reduce the beam size and deliver the beam into the spectrometer.
Once the SR beam enters into the Vertex 70 with assistance of the matching box, the microscope, Hyperion 2000, coupling to the Vertex 70 focuses the SR beam to micro-scale beam size. The beam size at sample position will additionally be adjusted by an auto-aperture system with respect to the sample.
Endstation
The experimental station is equipped with an FTIR-spectrometer – Vertex 70 and a fully automated microscope – Hyperion 2000 (Bruker) with a single point MCT detector. When an IR beam exits from the M5-M9 chamber, the matching optical box generates to reduce beam size and deliver the IR beam from the chamber into the Vertex 70.
After that, those analytic instruments optimize the SR beam proper to characteristics of each sample using OPUS software. The features in the OPUS software include data acquisition, data processing, evaluation, and report generation that users can request to access to process IR spectrum during or off beamtime by on-site or VPN if required.
Sampling techniques
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Transmission
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Transflection
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Reflection
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Simple Reflection
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Attenuated Total Reflection (ATR)
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The microscope can be operated in various modes of measurement with variety of different accessories provided at the beamline. With assistance of its motorized stage, it enables the point-by-point or grid collection of spectra from a sample to make the spatially resolved chemical maps.
Performance
The optical performance of the IR beam on sample is mainly relied on a size of aperture within Bruker's spectroscopy, Hyperion 2000 which is varied from 5 to 50 microns depending on sample. Thus, how SR is recommended over internal source for IR microspectroscopy.
