Analysis of termination effects on atomic radial density curves

✍ Scribed by John R. Townsend; Sabri Ergun

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 526 KB
• Volume: 6
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(68)90046-8

✦ Synopsis

There is evidence to indicate that carbon blacks are made up of distorted large graphite-like layers rather than small turbostratic crystallites. Atomic radial density curves offer a direct means of determining the true structure by revealing the extent of coherently scattering domains. Aside from experimental problems, the major difficulties with the radial density distribution method for determining atomic arrangements in matter have been the limited resolution and false structure usually found in the density curve. These defects are largely due to the fact that scattering data can only be obtained over a finite angular range instead of the infinite range required by theoretical considerations. False structure produced by this cut-off can be suppressed by use of an artificial convergence factor, but this further reduces the resolution of the density curve. A critical analysis is made of the termination effects and a method is described that provides a procedure for directly correcting the radial density curve for the cut-off effects with no sacrifice in resolution.