The segmented cylindrical mirror analyzer (CMA)

Highlights: • A method is presented applying segmentation to the electrodes of cylindrical mirror analyzer. • Improvement was found in resolution over the standard CMA by a factor of ∼10. • Segmentation of both outer and inner electrodes was required. - Abstract: The standard cylindrical mirror analyzer (CMA) has been modified by dividing the inner and outer electrodes into segments and setting the voltages on these segments to obtain the best value for the energy resolution. It has been found that dividing both the inner and outer electrodes using only one segment has resulted in an energy resolution of 0.017% for entrance angles of 42.3 ± 6°. This corresponds to more than an order of magnitude improvement in the resolution over that of the standard instrument.