Electron Momentum Spectroscopy measures the energy-momentum density of
the electrons in atoms, molecules and solids by means of a
kinematically-complete ionization reaction initiated by an electron
beam. The construction of spectrometers and the acquisition and
reduction of cross-section data are described in detail. The quantum
theory of the reaction is explained and the experimental verification is
given. It is shown how to extract quasiparticle orbitals, and
coefficients describing electron correlations of the data. These
quantities are derived from the many-body theory of the electronic
structure of atoms, molecules and solids. The relationship to less
complete methods of investigating electronic structure is discussed.
Examples are given of the determination of atomic and molecular orbitals
and quantities relating them to the observed states of the residual ion.
For amorphous, polycrystalline and crystalline solids and surfaces,
examples show the energy-momentum density of valence electron bands, and
effects due to electron diffraction and plasmon excitation.
The book aims to give a complete account of electron momentum
spectroscopy to date. Its significance is that it is a sensitive and
experimentally-verifiable test of essentially every aspect of
calculations of electronic structure. It is the only such probe
available.