Abstract
Electron momentum spectroscopy (EMS) makes it possible to examine orbital patterns of individual molecular orbitals in momentum space. A new spectrometer for electron–electron coincidence experiments for EMS has been developed to obtain orbital patterns quantitatively. Using a spherical analyzer and position-sensitive two-dimensional detectors combined with fast electronics, simultaneous measurements of energy and angular correlations between the two outgoing electrons can be made. This spectrometer features high sensitivity and an ease of changing impact energies. Details of the apparatus are described and impact energy dependence of electron momentum distributions of the HOMO of H 2 and biacetyl are compared.
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