Figure 2.3.3.3

Rossmann, M. G.; Arnold, E.

doi:10.1107/97809553602060000556

International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

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International Tables for Crystallography (2006). Vol. B. ch. 2.3, p. 243 | 1 | 2 |

Figure 2.3.3.3

M. G. Rossmann^a ^* and E. Arnold^b

^aDepartment of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA, and ^bCABM & Rutgers University, 679 Hoes Lane, Piscataway, New Jersey 08854-5638, USA
Correspondence e-mail: mgr@indiana.bio.purdue.edu

Figure 2.3.3.3

A Patterson with coefficients $[({\bf F}_{NH1} - {\bf F}_{NH2})^{2}]$ will be equivalent to a Patterson whose coefficients are $[(AB)^{2}]$ . However, $[{AB} = - {\bf F}_{H1} + {\bf F}_{H2}]$ . Thus, a Patterson with $[(AB)^{2}]$ coefficients is equivalent to having negative atomic substitutions in compound 1 and positive substitutions in compound 2, or vice versa. Therefore, the Patterson will contain positive peaks for vectors of the type $[H1 \cdot H1]$ and $[H2 \cdot H2]$ , but negative vector peaks for vectors of type $[H1 \cdot H2]$ .