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IX-C-1. Comparison of the absorption spectra of acetaldehyde with those for a series of aldehydes containing additional functional groups

IX-C-12. Absorption spectra of butenedial as measured in isooctane solution , open triangles rran -4-oxo-2-opentenal, closed, inverted triangles.

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

IX-C-14. Approximate quantum yields of the various primary photolysis channels involved in the photolysis of a near one-to-one mixture of trans- and cw-4-oxo-2-pentenal at low pressures data from Xiang et al. .

IX-C-16. Experimental measurements of the quantum yield of glyoxal photodecomposition by HC.

IX-C-17. Log plot of kq k data for the quenching of HCO formation by N2 gas in glyoxal photodecomposition in process . The estimates given by the dashed line that neglect the data point at the longest wavelength were used in this work to estimate values in air at 1 atm. from the values at zero pressure.

IX-C-18. Estimates of the quantum yields of primary processes in glyoxal photodecomposition in 1 atm. of air as a function of wavelength

IX-C-19. Estimated j-values for the decomposition of glyoxal in the lower troposphere as a function of solar zenith angle. Cloudless sky conditions were assumed with an overhead ozone column of 350 DU. The solid curves and dashed curves were caleulated using the eurrent quantum yields recommendations .

IX-C-2. Photolysis frequencies for HOCH2CHO as a function of solar zenith angle for a cloudless day within the troposphere with an overhead ozone column of 350 DU .

IX-C-20. Quantum yield data for the photodecomposition of methylglyoxal as a function of wavelength. Absorption spectrum for methylglyoxal is shown as the Ught-gray Une.

IX-C-21. Plot of the rate coefficients for quenching of HCO formation in the photolysis of methylglyoxal as a function of wavelength of excitation the least-squares line shown is given by

IX-C-22. Calculated photolysis frequencies as a function of solar zenith angle for methylglyoxal photodecomposition in the lower troposphere clear-sky conditions are assumed with an ozone column of 350 DU. The large differences between the EUPHORE estimates and the y-values calculated from f, a, and actinic flux data may reflect the removal of methylglyoxal by HO2 radicals that could not be eliminated in the EUPHORE experiments.

IX-C-23. Absorption cross sections for pinonaldehyde and caronaldehyde .

IX-C-24. Approximate photolysis frequencies for pinonaldehyde versus solar zenith angle as calculated for a clear tropospheric sky at an altitude of 0.5 km and an overhead ozone column of 350 DU. An effective quantum yield of 0.14, independent of wavelength, has been assumed as suggested from EUPHORE experiments . The two filled circles are measured values from the EUPHORE chamber.

IX-C-25. Comparison of the absorption spectra of some substituted acetaldehydes

IX-C-26. Comparison of the absorption spectra of the chlorine-atom-substituted acetaldehydes

IX-C-27. Comparison of the absorption spectra of some fluorine- and chlorine-atom-substituted acetaldehydes

IX-C-28. Comparison of the absorption cross sections as a function of wavelength for some halogen-atom-substituted aldehydes, .

IX-C-29. Approximate photolysis frequencies for CCI3CHO versus solar zenith angle for a cloudless day in the lower troposphere with an overhead ozone column of 350 DU the quantum yield of decomposition to form Cl-atoms was assumed to be unity at all absorbed wavelengths figure from Calvert et al. .

IX-C-3. Wavelength dependence of the absorption cross sections for glycidaldehyde Ma

IX-C-30. Approximate photolysis frequencies for CF3CHO versus solar zenith angle for a cloudless day in the lower troposphere. The quantum yield of photodecomposition to form CF3 and HCO radicals is assumed to be 0.17 at all wavelengths of absorbed light .

IX-C-31. Approximate photolysis frequencies for CHF2CHO versus solar zenith angle for a cloudless day in the lower troposphere with an overhead ozone column of 350 DU the quantum yield of decomposition to form CF2H and HCO radicals was assumed to be 0.30 at all wavelengths in accord with the effective quantum yield estimated by Sellevag et al. .

IX-C-4. Approximate glycidaldehyde photodissociation coefficients as a function of solar zenith angle as calculate for a cloudless, lower troposphere and an ozone column of 350 DU. A total quantum yield of decomposition of 0.6, independent of wavelength, was assumed in the calculations as estimated by Ma et al. .

IX-C-6. Estimated quantum yields for the photodecomposition modes of acrolein at about 25 C as a function of the concentration of air . The gray-dashed line marks the concentration of air at 1 atm. pressure and 298 K.

IX-C-8. Stern-Volmer plots of the l i deconj versus data for acrolein vapor for excitation at 313 and 334 nm where concentration of the synthetic air mixture. The gray-dashed line marks the concentration of air at 1 atm. pressure and 298 K.



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