An Electron Diffraction Investigation of the Molecular Structures of

T. TAYLOR BROUNAND R. L. LIVINGSTON

6084

of a-particles sufficiently energetic to produce the (a, n ) reaction is relatively very much lower in the monazite sample. The monazite also contains a much higher relative content of contaminants of high neutron-capture cross-sections than does pitchblende. Consequently, in a qualitative fashion,

[COSTRIBUTION FROM

THE

DEPARTMENT O F CHEMISrRY

Vol. i 4

the fact that monazite has a much lower ThZz9to Th232ratio than does pitchblende is satisfactorily explained, even on the assumption that nearly all of the ThZz9 is present as the result of the Th232(n, y) reaction. CHICAGO 80,

A N D THE P U R D U E

ILLINOIS

RESEARCH FOUNDATION, PURDUE UNIVERSITY]

An Electron Diffraction Investigation of the Molecular Structures of Ketene, Carbonyl Fluoride and Tetrafluoroethylene' 13Y

'r. T A Y L O R BROUNAND I