THE USE OF A FREQUENCY CHECK IN THE VECTOR VERIFICATION METHOD.
Abstract
The frequency check, utilizing three-dimensional superpositions of the Patterson and vector verification maps, assigns relative values to positions in electron-density space which are consistent with both the Patterson function and the space group symmetry of the crystal system. These relative values-which represent the extent of peak coincidence between a Patterson and electron-density function-facilitate the choice of the first tentative atom position, a decisive factor in the success of the vector verification procedure. Employing a bivalued Patterson map, each three-dimensional superposition resulting in a relative value requires one to five seconds on a large solid state computer. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 13, 1964
- Accession Number
- AD0612983
Entities
People
- Byron T. Gorres
- Robert A. Jacobson
Organizations
- Princeton University