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An electron coincidence spectrometer utilizing real-time optimization and control by a standard IBM 80286 personal computer is described. Details of the system hardware and software are presented together with a description of the optimization routine adopted for maintaining the tuning of the spectrometer and data acquisition. Data collected by the computer-controlled spectrometer for (e,2e) coincidence experiments are also presented.

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The author describes a novel variant of the Savitzky-Golay filter. By studying the underlying principles of the Savitzky-Golay filter a digital filter has been designed which improves the low-pass filter characteristics, whilst maintaining the 'shape'-conserving features of the original method. This novel variant is compared with the original method and a standard method of improving the low-pass characteristics, namely multiple applications of the original method. The variant incurs a similar computational overhead to the original method, and in addition provides improved filtering characteristics. Consequently it should supersede the Savitzky-Golay filter in spectroscopic applications.

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