Three‐dimensional x‐ray diffraction data from a single crystal of β‐F2 have yielded a crystal structure like that later found for the γ‐O2 phase in which no dimers are present. The unit cell is cubic, contains eight molecules, and has a lattice dimension of a=6.67±0.07 Å. The two molecules at 000 and ½ ½ ½ are approximately spherically disordered, and the six molecules approximately at ¼ ½ 0, ¾ ½ 0, 0 ¼ ½, 0 ¾ ½, ½ 0 ¼, and ½ 0 ¾ are highly disordered, respectively, in the planes x=¼, x=¾, y=¼, y=¾, z=¼, and z=¾. The value of is 0.10 for the 28 observed reflections.
REFERENCES
1.
2.
G. H. Cady and L. L. Burger, in Fluorine Chemistry, edited by J. H. Simons (Academic Press Inc., New York, 1951), Vol. 1.
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E. B. Wilson, Jr., An Introduction to Scientific Research (McGraw‐Hill Book Company, Inc., New York, 1952). This formula is a slight variation of one appearing on p. 245.
10.
The exponent 2 was inadvertently omitted from this formula as it appears in
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International Tables for X‐Ray Crystallography, Volume 1. Symmetry Groups (The Kynoch Press, Birmingham, England, 1952).
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1964
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