I have to fit this peak (which seems to be a double gaussian from other experiments) to find the peak position of the one at around 2.43 eV.
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Initially I thought was pretty straightforward. Here is the code I am using
NonlinearModelFit[
data[[100 ;; 330]], {amp1*Exp[-(x - mu1)^2/2 s1^2] + d2 +
amp2*Exp[-(x - mu2)^2/2 s2^2] - m*x + d,
mu1 < mu2}, {{s1, 20}, {amp1, 0.23}, {mu1, 2.43}, {m, 0.1}, {d,
0.3}, {amp2, 0.2}, {mu2, 2.44}, {s2, 40}, {d2, 0.2}}, x,
MaxIterations -> 15000]
But something goes wrong everytime I change slightly the fitting range (it finds a negative peak on the left side). Also the fit is not amazing. Can you suggest something to improve it? I also have to apply the same fit to similar dataset (where only the peak shifts) but again even if they are similar I get very different result. I would like to know how to make the fit more consistent and robust
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