Fit data NMR


by PhysicsGente
Tags: data
PhysicsGente
PhysicsGente is offline
#1
Dec10-12, 03:32 AM
P: 79
Hello, I didn't know where else to post this so here it goes ...

I have collected data from a pulsed NMR experiment to calculate the value of the spin-lattice relaxation time (T1). Now I'm asked to fit the data using a function of the form
V(t) = V_0*(1 - 2*exp(-t/T1)). But I'm not really sure how to fit it. Is there any software out there I can use to fit this data with that function? I was trying to fit it using ROOT but I did not succeed ;(.

The data is here, https://docs.google.com/open?id=0BwZ...ExfYU1GX2dyV3M
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mfb
mfb is offline
#2
Dec10-12, 09:47 AM
Mentor
P: 10,840
ROOT can fit that, but you should restrict the fitting range to t>=50 or use a different fit function (##|V(t)|## looks like a good idea), otherwise the result is meaningless. Even there, I doubt that the function gives a good approximation to the measured values.


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