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Voigt peak
modelname
Voigt|VBP
Complex dielectric function is described by three parameters \(N_1, E_1, B_1, L_1\):
$$
\hat\varepsilon = 1 + \frac{N_1{\rm i}}{\sqrt{2\pi} B_{\rm G1} E_1} \left[ \mathrm{W}\!\left( \frac{E-E_1+{\rm i}B_{\rm L1}}{\sqrt{2} B_{\rm G1}} \right) - \mathrm{W}\!\left( \frac{E+E_1+{\rm i}B_{\rm L1}}{\sqrt{2} B_{\rm G1}} \right) \right]
$$
$$
B_{\rm L1} = B_1 L_1 \,, \qquad B_{\rm G1} = \frac{B_1}{2\sqrt{2 \ln 2}} \sqrt{(1-a L_1)^2-(1-a)^2 L_1^2} \,, \qquad a=0.5346
$$
where \(\mathrm{W}\) is special complex function (Faddeeva). Model represents Voigt ε-broadened discrete spectrum.
attributes
-
number_of_terms - Adds terms and corresponding parameters.
-
Asymmetric|A - Add parameters \(M2, \dots\) defining asymmetrical peaks (number of peaks must be higher than 1). Appropriate for modelling of coupled phonon peaks.
-
Fano|F - Add parameters \(M1, \dots\) defining asymmetrical peaks. Appropriate for modelling of Fano resonace between phonon and free carriers.
-
ph - Units 1/cm are used for peak energies \(E_1, \dots\) and broadening parameters \(B_1, \dots\).
Example
media:
f = Voigt
newAD2> par
N1f = 0 fixed [0,inf) eV2
E1f = 1 fixed (0,inf) eV
B1f = 1 fixed (0,inf) eV
L1f = 1 fixed [0,1]
newAD2>
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