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d=(2.8,0.72,0.18) for C.
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zz(C) (the tensor component along the symmetry axis) at the 6-311G** level (using the optimized geometry) and find it to be 23.6 ppm, only 0.9 ppm less than in CO. While the basis set level used for this calculation is not the same, we present this comparison because this orbital contribution is due only to the "unperturbed" shielding (since the carbon lone pair orbital does not exhibit orbital angular momentum about the symmetry axis), which is very near its basis set limit.
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