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The spin lock field strength is noted '''$\nu_1$'''.<br>
The [[wikipedia:Chemical_shift | Chemical Shifts]] $\delta$ in ppm for nuclei of interest (ex. $^{15}$N and which have been loaded in with relax function [http://www.nmr-relax.com/manual/chemical_shift_read.html chemical_shift_read] from a [http://www.nmr-relax.com/manual/spectrum_read_intensities.html peak list formatted file]) is first converted to to the rad/s with the following function calls.<br>
$\bar{\omega}_{S,i} = 2\pi \cdot \delta_{S,i} \cdot B_0 \cdot \frac{\gamma_{^{15}N}}{\gamma_{^{1}H}}$
<source lang="python">
shifts[ei][si][mi] = frequency_to_rad_per_s(frq=shift, B0=frq, isotope=spin.isotope)