Figure 2
(a) Photograph of the FTIR beamline, and (b) schematic drawing of the optical system for this beamline. The circular mirror, made of Al, is placed around the electron orbit inside the storage ring. It can collect the SR photons from the whole arc of the electron orbit. MP, MS, MM, MF and MPR represent plane, spherical, moving, fixed and parabolic mirrors. BS is a Mylar beam-splitter. A and SC represent the variable aperture and sample cell. TS is an internal thermal source. A defines the effective source size of the thermal source as well as of the synchrotron source; in this experiment it was 2 mm diameter. |