A HIGH-RESOLUTION 4-PI MULTIELECTRON SPECTROMETER FOR SOFT ELECTRONS

Electrons emerging from ionizing collisions of any projectiles (ions, photons, electrons) with the particles in a supersonic jet target (ato ms, clusters, molecules) are projected onto three large-area, multi-hi t capable position sensitive detectors applying well controlled electr ic and solenoidal magnetic fields. Up to three electrons with an energ y bandwidth for each between 0 eV less than or equal to E-e less than or equal to 1 keV are detected simultaneously with a solid angle close to 4 pi. Each momentum vector (three spatial components p(ei)) is cal culated from the measured hitting positions and time-of-flights with a resolution of Delta p(ei) < 2 x 10(-2) a.u.. Thus, the complete final many-electron momentum space (up to 9 momentum components) is visuali zed. The theoretical limits in resolution achievable with such a metho d is in the neV-regime. In addition, the recoil-ion momentum vector is determined simultaneously applying ''conventional'' recoil-ion moment um spectroscopy.