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# Accession Number:

## AD0006196

# Title:

## A GRAPHICAL METHOD OF EVALUATING CERTAIN CRYSTALLOGRAPHIC STRUCTURE FACTORS

# Descriptive Note:

# Corporate Author:

## MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR INSULATION RESEARCH

# Report Date:

## 1953-02-01

# Pagination or Media Count:

##
16.0

# Abstract:

## A graphical method is described for evaluating structure factor s of the form Fhk o to n of f sub r hk cos 2 pi hx sub r ky sub r and electron density expressions of the form rhoX,Y sum over H sum over K Fhk cos 2 pihX kY. The method depends upon the fact that if in a 2- dimensional001 projection of a unit cell the normal to the planes hk0 is graduated with the appropriate cosine function giving the phases of points along the normal, then a circle, having its center at X2, Y2 and passing through the origin will cut the normal to Fhk0 at the value of cos 2 pihx ky. The practical limitations and general utility of the construction are discussed.

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#