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IX-E-15. Quantum yield of singlet methylene formation as a function of wavelength in the photodecomposition of ketene at low pressures.

IX-E-16. Stem-Volmer plots of the reciprocal of the quantum yield of CO formed in the photolyses of pure ketene as a function of the pressure of ketene at several wavelengths of excitation.

IX-E-18. Plot of the rate coefficients for the decomposition of electronically excited ketene molecules as a function of the wavelength of excitation of the ketene.

IX-E-19. Shown as the solid line in the figure are the approximate rate coefficients for quenching of excited ketene molecules as estimated from the measurements of Potter et al. and the equation describing the fcq fcd data given in figure IX-E-17.

IX-E-20. Percentage of C-atom exchange in the photolysis of CH2 C 0 and CH2—as a function of wavelength .The gray long-dashed and short-dashed lines show the wavelength of onset of the photodissociation to form CH2 and CH2, respectively.

IX-E-21. Quantum yields of photodecomposition of ketene versus wavelength cross sections of ketene versus wavelength, gray curve wavelengths of onset of CH2 and CH2 are indicated by the long-dashed line and short-dashed line, respectively.

IX-E-22. Photolysis frequency of ketene versus solar zenith angle as calculated for a cloudless day within the lower troposphere with an ozone column of 350 DU.

IX-E-3. Approximate y-values as a function of solar zenith angle for the photodecomposition of cyclopropanone on a cloudless day within the troposphere with an overhead ozone column of 350 DU. Quantum yields versus wavelength data are from Thomas and Rodriguez .

IX-E-4 shows as a function of wavelength at two pressures the ratios of propene to cyclopropane products that are formed in alternative pathways for reaction of the vibrationally excited cyclopropane molecule. A large increase in this ratio is seen as the excitation energy is increased in photolysis at the shorter wavelengths. A cyclopropane molecule that is vibrationally richer results as the quantum energy is increased. A somewhat more efficient quenching of the vibrationally excited cyclopropane can be seen for the data from 11 Torr of cyclobutanone . One expects that an atmosphere of air will result in more significant

IX-E-6. Plot of the quantum yields of the primary processes in cyclobutanone photolysis as a function of wavelength data from McGee .

IX-E-7. Approximate j-values for cyclobutanone photodecomposition versus solar zenith angle for a cloudless day in the lower troposphere with an overhead ozone column of 350 DU. Process

IX-E-8. The effect of added ethene on the relative rates of the primary processes in the 325 nm photolysis of 1 Torr of cw-2,3-dimethylcyclobutanone

IX-E-I I. Ratio of products cyclobutane ethene versus ketone pressure for photolysis of cyclopentanone-2,2,5,5- figure from Calvert et al.

IX-E-I. Approximate absorption cross sections versus wavelength for cyclopropanone vapor cyclohexanone vapor was measured independently in two laboratories

IX-E-IO. Plot of the ratio of quantum yields for primary processes in 2-n-propylcyclobutanone

IX-E-S. Plot of the ratio of products, .

IX-F-12. Comparison of the absorption cross sections for perfluoro-2-methyl-3-pentanone CF3CF2C.

IX-F-13. Estimated photolysis frequencies for CF3CF2C that were made in the EUPHORE chamber on July 14, 2003.

IX-F-14. Comparison of the absorption spectra of acetone the approximate wavelength distribution of the actinic flux within the lower troposphere at solar noon is shown by the dashed-gray curve.

IX-F-16. The effect of added air on the product ratio, CH3CHO CO2, from pyruvic acid photolysis at 345 and 366 nm .

IX-F-17. Photolysis frequencies for pyruvic acid photodecomposition as calculated as a function of solar zenith angle for 0.5 km altitude and an overhead ozone column of 350 DU. Three different scenarios are assumed for the loiai and its variation with X see the text. The EUPHORE data were reported by Hjorth et al. .

IX-F-18. Stern-Vokner plot of l ioiai versus pressure of air from methyl vinyl ketone photodecomposition data of Gierczak et al. .

IX-F-19. Plot of the estimated quantum yields of photodecomposition of methyl vinyl ketone in 760 Torr of air as a function of wavelength. The three data points shown are from the Stern-Volmer plot of figure IX-F-18 using the data of Gierczak et al. .

IX-F-2. Comparison of the approximate absorption spectra for F-substituted acetones, CFsCfOfCHs, CF3C.

IX-F-20. Methyl vinyl ketone photolysis frequencies as a function of solar zenith angle as calculated for a clear tropospheric sky at 0.5 km altitude and an overhead ozone column of 350 DU. The measurement in the EUPHORE chamber was reported by Hjoth



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