Bromine nitrate, BrON02, has been synthesized and purified, and its ultraviolet and infrared spectra have been measured. The stratospheric photolysis of BrON02 is about twenty times more rapid than that of the analogous C10N02. However, since HBr is not as important a sink in the BrO*-catalytic chain for removal of stratospheric ozone as HC1 is for the CIO* chain, as much an 10-20% of the Br may be present as BrON02. Measurements of the rate of its formation from BrO + N02 + M are necessary for accurate estimate of the stratospheric importance of BrON02. Publication costs assisted by the University of MiamiThe vacuum-ultraviolet photolysis of tetrahydrofuran, 1:1 mixtures of tetrahydrofuran:tetrahydrofuran-d8, and tetrahydrofuran-3,3,4,4-d4 was investigated using xenon (147.0 nm) and krypton (123.6 nm) resonance radiation. Nitrogen oxide and hydrogen iodide were extensively employed as a means of determining radical yields. Mass spectral analysis of major components contributed to the identification of radical species, intermolecular processes, and intramolecular rearrangements. Major product of the photolysis include ethylene, propylene, cyclopropane, carbon monoxide, and hydrogen. Evidence is presented for the occurrence of seven primary reaction channels to which quantum yields have been assigned.

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Reactions of OH(v = 1) with HBr, 0, and CO have been studied at 295°K using a fast discharge flow apparatus:The reaction 0 + HBr ---f OH(v = 1) + Br was used as a source of OH(v = l ) , and subsequent chemical reactions of the excited radical were followed using EPR spectroscopy. Rate constants for reactions (2b), (3b), and (6b) were measured as (4.5 f 1.3) X (10.5 f 5.3) X 10-'1, and < 5 X 10-12 cm3/molec.sec, respectively. The rate constant for physical deactivation of OH(r = 1) by CO was determined as < 4 X lO-'3 cm3/molec.sec.

The temperature dependence is approximately T~3, leading to a rate constant for formation about a factor of 2 to 3 higher at stratospheric temperatures. (23) Reference 16 also reports a rapid reaction of CI0N02 with S02 and N02, but we have not observed such reactions at room temperature. (24) D. Wuebbles and F. Luther, unpublished calculations. (25) P. Crutzen, Joint IAOC/ICACGP Symposium on Atmospheric Ozone,

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