DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
Accession Number:
AD0612983
Title:
THE USE OF A FREQUENCY CHECK IN THE VECTOR VERIFICATION METHOD.
Corporate Author:
PRINCETON UNIV N J
Report Date:
1964-02-13
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
Descriptive Note:
Revised ed.,
Supplementary Note:
Pub. in Acta Crystallographica (Denmark) v17 pt12 p1599-1603 Dec 1964 (Copies available only to DDC users).
Pages:
0005
File Size:
0.00MB
