Methacrolein CH2C(CH3)CHO absorption cross-sections (298K) Taken from: MPI_Mainz Spectral Atlas (http://www.atmosphere.mpg.de/enid/2295) IUPAC 2005 Recommendation http://www.iupac-kinetic.ch.cam.ac.uk T. Gierczak, J.B. Burkholder, R.K. Talukdar, A. Mellouki, S.B. Barone, and A.R. Ravishankara: Atmospheric fate of methyl vinyl ketone and methacrolein, J. Photochem. Photobiol. A: Chem. 110, 1-10 (1997) Quantum Yields Very low total qy (< 0.05 IUPAC 2005) Average of the optimised total QY of 0.0039 used from: 1. Carter, 2000. Documentation of the SAPRC-99 chemical mechanism for VOC reactivity assessment. Final Report to California Air Resources Board Contract 92-329 and Contract 95-308, Air Pollution Research Center and College of Engineering Center for Environmental Research and Technology University of California Riverside, California. 2. Pinho et al., Atmos Env, 39(7), 1303-1322 (2005) 3. RADICAL, 2002. Final report on the EU fourth framework project ‘evaluation of radical sources in atmospheric chemistry through chamber and laboratory studies, RADICAL’. European Communities Report EUR 20254 EN, G.K. Moortgat (Coordinator), MPI Mainz, Germany phi1 (CH3C=CH2 + HCO) = 1.95E-3 phi2 (CH2=C(CH3)CO + H) = 1.95E-3 (see AtmosEnvPinho05 for details) T = 298 K, resolution = 1 nm wavelength (nm) xsect (cm2) 250 2.07E-21 251 1.94E-21 252 1.87E-21 253 1.80E-21 254 1.78E-21 255 1.77E-21 256 1.80E-21 257 1.80E-21 258 1.86E-21 259 1.93E-21 260 2.01E-21 261 2.11E-21 262 2.24E-21 263 2.41E-21 264 2.63E-21 265 2.83E-21 266 3.05E-21 267 3.33E-21 268 3.63E-21 269 3.98E-21 270 4.36E-21 271 4.79E-21 272 5.20E-21 273 5.67E-21 274 6.16E-21 275 6.73E-21 276 7.32E-21 277 7.93E-21 278 8.63E-21 279 9.36E-21 280 1.01E-20 281 1.09E-20 282 1.18E-20 283 1.26E-20 284 1.35E-20 285 1.45E-20 286 1.56E-20 287 1.67E-20 288 1.79E-20 289 1.90E-20 290 2.03E-20 291 2.16E-20 292 2.28E-20 293 2.40E-20 294 2.52E-20 295 2.68E-20 296 2.85E-20 297 2.99E-20 298 3.13E-20 299 3.26E-20 300 3.44E-20 301 3.61E-20 302 3.76E-20 303 3.91E-20 304 4.04E-20 305 4.19E-20 306 4.40E-20 307 4.58E-20 308 4.71E-20 309 4.81E-20 310 4.92E-20 311 5.13E-20 312 5.35E-20 313 5.50E-20 314 5.61E-20 315 5.70E-20 316 5.87E-20 317 6.04E-20 318 6.19E-20 319 6.28E-20 320 6.27E-20 321 6.18E-20 322 6.21E-20 323 6.34E-20 324 6.58E-20 325 6.74E-20 326 6.73E-20 327 6.68E-20 328 6.83E-20 329 7.07E-20 330 7.15E-20 331 7.16E-20 332 7.03E-20 333 6.69E-20 334 6.41E-20 335 6.08E-20 336 5.97E-20 337 6.25E-20 338 6.38E-20 339 6.37E-20 340 6.24E-20 341 6.02E-20 342 5.98E-20 343 6.58E-20 344 6.79E-20 345 6.53E-20 346 6.11E-20 347 5.63E-20 348 5.22E-20 349 4.55E-20 350 4.16E-20 351 3.85E-20 352 3.89E-20 353 4.35E-20 354 4.31E-20 355 4.14E-20 356 3.62E-20 357 3.53E-20 358 3.46E-20 359 3.81E-20 360 5.05E-20 361 4.28E-20 362 3.61E-20 363 2.86E-20 364 2.68E-20 365 2.33E-20 366 1.92E-20 367 1.62E-20 368 1.40E-20 369 1.31E-20 370 1.42E-20 371 1.67E-20 372 1.53E-20 373 1.43E-20 374 1.08E-20 375 9.77E-21 376 1.00E-20 377 1.07E-20 378 1.35E-20 379 2.18E-20 380 1.30E-20 381 9.84E-21 382 5.55E-21 383 4.56E-21 384 3.64E-21 385 3.31E-21 386 2.46E-21 387 2.05E-21 388 1.81E-21 389 1.61E-21 390 1.47E-21 391 1.56E-21 392 1.59E-21 393 1.53E-21 394 1.49E-21 395 1.23E-21