NOVEL MOMENTUM-RESOLVING MULTICHANNELING ELECTRON AND ION SPECTROMETER.

A description is given of a novel dispersive spectrometer which processes simultaneously all electrons or ions emitted from a sample under various polar angles theta at a certain azimuth phi by focusing the source spot onto a ring focus containing a position-sensitive detector. By mechanical variation of phi , the entire phi - THETA -E-space can be investigated. An on-line computer coupled to the analyzer serves for data acquisition and processing. The spectrometer can also be used with ions. The properties and advantages of the spectrometer are discussed. It can be used for angle-resolved photoelectron and Auger spectroscopy, LEED, ISS, as well as other angle-resolved techniques (ESD, PSD, etc. ).