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Note that $\Omega_S$ is dependent of the [[wikipedia:Chemical_shift | chemical shifts]] $\delta$ in ppm for the nuclei of interest, and is first calculated later.
Relax needs input for $\mathbf{\omega_{rf}}$ in ppm, and converts to the rad/s, with the following function calls.
<source lang="python">
offsets[ei][si][mi][oi] = frequency_to_rad_per_s(frq=cdp.spin_lock_offset[id], B0=frq, isotope=spin.isotope)