Changes

 == SI Supplementary Units - The dimensionless and hidden radian unit ==

This post is mainly for later reference, but concept is quite important for understanding the relaxation equations in NMRor, in fact, and actually any rotational physical processin physics. It is important for understanding the model-free equations, for reduced spectral density mapping, for SRLS, and for relaxation dispersion. The reason is because R1 and R2 are measured in rad/s. As I describe in section 1, the radian unit can be dropped because it is plainly obvious that NMR and relaxation is an angular process and hence radian units are implied (that was sarcastic). Hence R2 can be said to be in units of 1/s, but never, ever Hz. Also note that because of the SI conventions described below, describing the correlation time in s units does not prove that there are no radian units. But reporting rates as Hz implies no radian units whereas reporting as 1/s instead often means radian units are present.

== Source ==

== SI supplementary units ==

=== SI supplementary units (radian and steradian) ===

=== IUPAC report ===

== Spherical harmonics ==

== Rotational correlation times ==

=== Book quotations ===

== Relaxation rates ==

Here, my opinion is that the R1 and R2 The units for relaxation rates are in rad/s. The equationsfrom the book quotations hopefully show this conversion from Hz torad/s.

=== Book quotations ===