Dielectric function tools¶
ComplexSignal and can
thus access complex properties. To convert a
ComplexSignal to a
make sure that the signal dimension and signal type are properly set:
Number of effective electrons¶
The Bethe f-sum rule gives rise to two definitions of the effective number (see [Egerton2011]):
where is the number of atoms (or molecules) per unit volume of the sample, is the vacuum permittivity, is the electron mass and is the electron charge.
method computes both.
Compute the electron energy-loss signal¶
“naively” computes the single-scattering electron-energy loss spectrum from the
dielectric function given the zero-loss peak (or its integral) and the sample
where is the zero-loss peak integral, the sample thickness, the collection semi-angle and the characteristic scattering angle.