Density of States (DOS)
- Practical Electron Microscopy and Database -
- An Online Book -

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

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The density of states of a system with a periodic potential can be split up into each band,

          probability of the transition, density of states ----------------- [3794a]

          probability of the transition, density of states ----------------- [3794b]

where,
          Sn(ε) -- A surface of constant energy.

For instance, the density of states at the Fermi energy is obtained by an integral over the Fermi surface.

By solving the Schrödinger equation for the potential in a solid, the electron states in the solid can be expressed by the wave function, ψ(r). During the scattering process induced by the incident electrons in TEM-EELS measurements, each ejected electron makes a transition from an initial state, ψi(r), to an originally unoccupied and final state, ψf(r). Based on Fermi's golden rule, the intensity (IE, θ) in the ionization edge at a given energy loss (E) in EELS profile and scattering angle (θ) of the incident electrons, reflecting the probability of the transition (Ti→f) is given by,

          probability of the transition, density of states ----------------- [3794c]

where,
          a0 -- The Bohr radius;
          ρ(E) -- The density of states (DOS) at a given energy loss.

 

 

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