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IX-F-21. Plot of the quantum yield of CO formed in the 435.8 nm photodecomposition of biacetyl show a linear increase with D, while those at 75 C and the higher intensities of absorbed light are relatively unchanged with D.

IX-F-22. Plot of the quantum yield of CO and the near equivalent quantum yield product function, 24 c2H6 4 ch4 IjchsCocHs versus temperature. Data are from the photolysis of biacetyl as reported by Placet and Bell .

IX-F-23. Plot of the quantum yields of CO and CH3I as a function of wavelength from the photodecomposition of biacetyl in mixtures with I2 temperature 65-150 C , and Bell and Blacet

IX-F-24. Plot of the ratio 2 l co K coi 4 co versus temperature for photolyses of hiacetyl at relatively long wavelenghs of excitation.

IX-F-26. Plot of the estimated photolysis frequencies for biacetyl in the lower troposphere assuming an overhead ozone column of 350 DU. Two alternative wavelengths for the cutoff of photodissodation have been assumed. The data given by the dashed curve are estimates derived using the relation fory in EUPHORE chamber

IX-F-27. The absorption cross sections for trani-3-hexene-2,5-dione as measured in acetonitrile solution .

IX-F-29. Estimated photolysis frequencies versus solar zenith angle for 3-hexene-2,5-dione as a function of solar zenith angle for a clear lower troposphere and ozone column of 350 DU see text for methods employed.

IX-F-2S. Estimates of the quantum yields for the primary photodecomposition process of biacetyl versus wavelength. The small filled circles are estimates based on the assumption of 4 i 0II 1.0 at 280 nm and the measurements of 0n-

IX-F-3. Comparison of the absorption spectra of some F-, Cl-substituted acetones

IX-F-4. Approximate photolysis frequencies versus solar zenith angle for H0CH2C.

IX-F-5. Approximate photolysis frequencies versus solar zenith angle for C1CH2C.

IX-F-6. Approximate photolysis frequencies versus solar zenith angle for BrCH2C.

IX-F-7. Comparison of quantum yields of CO from CF3C.

IX-F-8. Quantum yields of CO as a function of wavelength in photolyses of Cp3C at 22 C.

IX-F-9. Quantum yields of 2,3-butanedione from photolyses of CF3C.

IX-F-I I. Approximate photolysis frequencies versus solar zenith angle for Cp3CCH3 given in

IX-F-I. Comparison of the absorption cross sections for the monosubstituted acetones, CHjFCfOfCHs .

IX-F-IO. Approximate photolysis frequencies versus solar zenith angle for CFjClOlCHs photodecomposition .

IX-G-1. Comparison of the wavelength dependence of the cross sections of some halogen-atom-substituted formaldehyde molecules and the actinic flux as measured for a cloudless day .

IX-G-2. Comparison of the wavelength dependence of the cross sections of acetaldehyde and some halogen-atom-substituted acetaldehyde molecules, the acetyl chlorides. There is relatively poor overlap of the spectra for most acetyl chlorides with the distribution of the actinic flux as measured at noon for a cloudless day near Boulder, CO figure from

IX-G-3. Comparison of the photolysis frequencies for photodecomposition by all modes versus solar zenith angle for some acyl halides for which absorption of tropospheric actinic flux is measurable within their long-wavelength tails

IX-H-1. Absorption spectra of some simple aUcyl nitrites and that is shown by the heavy gray curve.

IX-H-10. Photolysis frequencies for WO-C3H7ONO as a function of solar zenith angle as calculated from the cross section data of table IX-H-4, quantum yield data of table lX-H-5, and actinic flux data for a cloudless day in the lower troposphere with an overhead ozone column of

IX-H-12. Approximate photolysis frequencies as a function of solar zenith angle for n-C4H9ONO as calculated for a cloudless day in the lower troposphere for an overhead ozone column of 350 DU.

IX-H-13. Approximate photolysis frequencies for WO-C4H9ONO versus solar zenith angle for a cloudless day in the lower troposphere with an overhead ozone column of 350 DU.



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