Calculate dipolar EPR (DEER) signal.

K = dipkernel(t,r)
K = dipkernel(t,r,gAB)

dipkernel calculates the DEER signal for two coupled electron spins-1/2 spaced a distance rr apart. t is the pump pulse position time axis (in microseconds), and r is the distance or array of distances (in nanometers).

If r is a single value, then the output K contains a single vector. If r is a vector, K is matrix, with K(i,j) corresponding to K(t(i),r(j)).

The optional input gAB contains the g factors of the two electron spins, [gA gB. If omitted, the free-electron g value 2.002319 (see gfree) is used for both spins.

dipkernel assumes a complete powder average, and absence of exchange couplings and orientation selection.

Calculate the DEER signal for two electron spins spaced 3.1 nm apart:

r = 3.1;   % nm
t = linspace(-0.1,3,301);  % µs
V = dipkernel(t,r);
plot(t,V)

Calculate the DEER signal for two electron spins with a distribution of distances:

r = linspace(0,6,1001);   % distance range
P = gaussian(r,3.5,0.3);  % distance distribution
t = linspace(-0.1,4,301); % time range
K = dipkernel(t,r);       % dipolar kernel
V = K*P(:);
plot(t,V);

diptensor, ham_ee, gfree