Analog Computer Plus LITERATURE CITED( 1 ) Crout, P. D., Trans. A m . I m t .

A new crystalline compound, NF4-BF4-, has been prepared by exposing the heterogeneous ternary system NF3-BF3-F2 to 3-MeV bremsstrahlung at 77°K. The G value for the reaction (molecules isolated per 100 eV absorbed) is about unity.The compound is stable at room temperature in dry air; it decomposes above 250°to the reactants.It reacts rapidly with moisture and with organic substances. The indicated ionic structure is confirmed by infrared and Raman spectroscopy.The X-ray powder pattern can be indexed on the basis of a tetragonal unit cell with a = 7.01 and c = .22 A. Irradiation of mixtures of nitrogen trifluoride and excess fluorine at 77°K has led to isolation in low yields of a white solid. It decomposes below 143°K to liberate nitrogen trifluoride and reacts with boron trifluoride at low temperature to form NF4BF4.Its most likely identity is perfluoroammonium fluoride.

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THE structure of O,F, has been known for some time from microwave studies,l and several of the vibrational frequencies have been either estimated1 or observed ;2-4 however, no complete i.r. spectrum of this molecule has yet appeared. Although the molecule has the same symmetry as H,O,, namely C,, the 0-0 bond is much shorter than that in H,O, (1-217 r f vs. 1.48 A), being about the same as that of 0,, while the 0-F bonds are considerably longer than those in OF, (1.575

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