paramagpy.metal.Metal.dsa_r1

Metal.dsa_r1(position, gamma, csa=0.0)

Calculate R1 relaxation due to Curie Spin

If the metal has an anisotropic magnetic susceptibility, this is taken into account, resulting in orientation dependent PRE as predicted by Vega and Fiat. CSA cross-correlated relaxation may be included by providing an appropriate CSA tensor.

Parameters

• position (array of floats) – three coordinates (x,y,z) in meters

• gamma (float) – the gyromagnetic ratio of the spin

• csa (3x3 matrix (optional)) – the CSA tensor of the given spin. This defualts to 0.0, meaning CSAxDSA crosscorrelation is not accounted for.

Returns

value – The R1 relaxation rate in /s

Return type

float