EasySpin forum

I am want to calculate resonance fields for ruby single crystal standards, with magnetic field perpendicular to c axis:
Sys.S = 3/2;
Sys.g = [1.9819 1.9817]; %
Sys.D = [ -11493/2 0 ]; % MHz (D,E)

Exp.mwFreq = 9.5; % GHz
Exp.Range = [0 600]; % mT sweep
Exp.SampleFrame= [0 pi/2 0]; % B ⟂ c

[B,Int] = resfields(Sys,Exp);

disp (B);

I use g and D values from the book that came with the standard. the values I get in easy spin using the code above are 538.6885
195.3545 mT but the book provides 5386.7 and 1953.5 Oe. Is it a known discrepancy or am I missing something?

The values are identical to within 4-5 significant figures (recall that 1 mT = 10 Oe). Any discrepancy beyond these digits is possibly due to the limited precision of g and D. And who knows what values for the fundamental constants (Planck constant, Bohr magneton, etc.) were used in the book.