Unevenly spaced field-swept data

[christiansen]

Dear Easyspin community

I am trying to fit some data where my data points (intensity vs. field) are not equally spaced along the field axis. Can pepper/esfit coomodate that? As far as I can tell from the documentation, it is only possible to define a number of point (Exp.nPoints) and either a range (Exp.Range) or a centre+width (Exp.CenterSweep).

[christiansen]

I found a solution for this: Write a custom function that interpolates a simulated spectrum using a spline and evaluate it at the unevenly spaced field values:

Code: Select all

function [B, spc] = splinespc(Sys, Exp, Opt)
Exp.nPoints = 10e4; %some arbitrary number

%Exp.XData contains the field values at which your data was measured
Exp.Range = [min(Exp.XData) max(Exp.XData)];

if exist('Opt','var')
    [Btemp,spctemp] = pepper(Sys,Exp,Opt);
else
    [Btemp,spctemp] = pepper(Sys,Exp);
end

B = Exp.XData;
spc = spline(Btemp,spctemp,B);

end

However, I think it could still be very convenient if it was possible to give a user-defined range for field values instead of simply using "Exp.Range" or "Exp.CenterRange", which gives linearly spaced points.

[Stefan Stoll]

Supporting unevenly (but still strictly monotonically increasing) field values could in principle be implemented, but it seems that you found an excellent and not too complicated solution for this!