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  • A New Beamline For New Users -- The CMA

    A new instrument for synchrotron radiation based photoemission spectroscopy has recently been put into service at SRC. This is part of a new program at SRC to enhance the support facilities for new users of synchrotron radiation. The cylindrical mirror analyzer (CMA) photoemission system has been designed to be useful in a broad range of experiments, while maintaining enough flexibility to be adaptable to special needs of any particular experiment. The system is maintained by the SRC, under the direction of William O’Brien.

    The new system is built around a high resolution, double pass CMA. This analyzer has a demonstrated energy resolution below 0.1 eV with the excellent collection efficiency characteristic of a CMA. It contains an integral electron gun, so that Auger electron spectroscopy can be performed on samples for additional characterization.

    The instrument is fully computer controlled, so that complex photoemission experiments or photoabsorption experiments can be easily carried out. The computer system is a high-end PC, with an attached printer for hardcopy spectra.

    There are a number of conveniences built into the design, including a sample load lock, sample heating and cooling, a gas dosing system for up to three gases, and sputter etch sample cleaning. Users with special experimental needs can bring their own sample manipulator and install it in the chamber. For further information or technical questions about the SRC “CMA system”, please contact Dr. O’Brien at 608-877-2364, or by e-mail at

    Aladdin -- Editor Brian Tonner