From tyndall@ucar.edu Wed Jul 11 15:39:40 2001 To: sasha@acd.ucar.edu Here's the HOCH2CHO UV spectrum. We found an average quantum yield in 700 torr air of >0.5 and a product yield consistent with: CH2O + CO + 2 HO2 50% CH3OH + CO 20% (assuming an overall quantum yield of around 0.7). Ref: The Atmospheric Chemistry of Glycolaldehyde, C. Bacher, G. S. Tyndall and J. J. Orlando, J. Atmos. Chem., 39 (2001) 171-189. Geoff Geoffrey S. Tyndall, Laboratory Kinetics Project Atmospheric Chemistry Division National Center for Atmospheric Research P.O. Box 3000, Boulder, CO 80307, USA wavelength(nm) cross section (cm2) 205.00 3.91E-19 206.00 3.37E-19 207.00 2.87E-19 208.00 2.46E-19 209.00 2.12E-19 210.00 1.81E-19 211.00 1.53E-19 212.00 1.30E-19 213.00 1.12E-19 214.00 9.40E-20 215.00 7.84E-20 216.00 6.49E-20 217.00 5.30E-20 218.00 4.26E-20 219.00 3.37E-20 220.00 2.65E-20 221.00 2.13E-20 222.00 1.65E-20 223.00 1.36E-20 224.00 1.12E-20 225.00 9.33E-21 226.00 7.83E-21 227.00 6.91E-21 228.00 6.37E-21 229.00 6.37E-21 230.00 6.49E-21 231.00 6.44E-21 232.00 6.80E-21 233.00 7.23E-21 234.00 7.85E-21 235.00 8.33E-21 236.00 8.80E-21 237.00 9.39E-21 238.00 1.03E-20 239.00 1.11E-20 240.00 1.20E-20 241.00 1.28E-20 242.00 1.38E-20 243.00 1.50E-20 244.00 1.59E-20 245.00 1.71E-20 246.00 1.83E-20 247.00 1.95E-20 248.00 2.09E-20 249.00 2.22E-20 250.00 2.36E-20 251.00 2.50E-20 252.00 2.65E-20 253.00 2.82E-20 254.00 2.97E-20 255.00 3.09E-20 256.00 3.21E-20 257.00 3.39E-20 258.00 3.59E-20 259.00 3.75E-20 260.00 3.89E-20 261.00 4.02E-20 262.00 4.13E-20 263.00 4.24E-20 264.00 4.40E-20 265.00 4.60E-20 266.00 4.75E-20 267.00 4.85E-20 268.00 4.92E-20 269.00 4.99E-20 270.00 5.05E-20 271.00 5.14E-20 272.00 5.23E-20 273.00 5.36E-20 274.00 5.40E-20 275.00 5.41E-20 276.00 5.39E-20 277.00 5.42E-20 278.00 5.37E-20 279.00 5.34E-20 280.00 5.34E-20 281.00 5.37E-20 282.00 5.37E-20 283.00 5.25E-20 284.00 5.12E-20 285.00 5.01E-20 286.00 4.93E-20 287.00 4.80E-20 288.00 4.67E-20 289.00 4.58E-20 290.00 4.50E-20 291.00 4.41E-20 292.00 4.19E-20 293.00 3.96E-20 294.00 3.76E-20 295.00 3.59E-20 296.00 3.46E-20 297.00 3.29E-20 298.00 3.17E-20 299.00 3.02E-20 300.00 2.90E-20 301.00 2.74E-20 302.00 2.51E-20 303.00 2.26E-20 304.00 2.07E-20 305.00 1.91E-20 306.00 1.77E-20 307.00 1.64E-20 308.00 1.50E-20 309.00 1.36E-20 310.00 1.25E-20 311.00 1.15E-20 312.00 1.03E-20 313.00 8.84E-21 314.00 7.71E-21 315.00 6.89E-21 316.00 5.97E-21 317.00 5.16E-21 318.00 4.55E-21 319.00 3.96E-21 320.00 3.29E-21 321.00 2.85E-21 322.00 2.49E-21 323.00 2.13E-21 324.00 1.85E-21 325.00 1.47E-21 326.00 1.28E-21 327.00 1.05E-21 328.00 8.75E-22 329.00 8.43E-22 330.00 6.84E-22 331.00 5.80E-22 332.00 4.39E-22 333.00 4.07E-22 334.00 4.39E-22 335.00 3.88E-22