This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

=================================================================================

Electron energy loss spectroscopy (EELS) is related to electronic, optical and mechanical properties of the observed materials. Actually, the EELS in the low-energy loss region less than 50 eV is particularly called valence electron energy loss spectroscopy (VEELS). This low loss region mainly reflects:
        i) Excitation of valence band electrons (outer shell electrons), such as interband transition (single excitation) and plasmon excitation (collective excitation).
        ii) Electronic structure.

Both i and ii) above determine the optical properties of materials.