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. Author manuscript; available in PMC: 2011 Dec 7.
Published in final edited form as: Phys Chem Chem Phys. 2010 Oct 8;12(45):14873–14883. doi: 10.1039/c0cp00795a

Figure 3.

Figure 3

(a) Molecular structure of a peptide unit depicting the orientation of chemical shift tensor of the amide nitrogen in the molecular frame, defined by the N-H bond (z-axis) and the C-N-H peptide plane. (b) Euler rotations between the principal axis system (PAS) of the CSA tensor and the molecular frame. Euler angles αNH and βNH represent the orientation of the three principal elements of 15N CSA tensor in the peptide unit. The peptide plane contains the N-H bond and the δzz principal component of the 15N CSA tensor as shown in (b), with a zero Euler angle γ.