D

Deliquescence of salts in particles, 389-390 Denuders, 567-568 Deposition velocity of, 33 wet vs. dry, 30-33 Diatomic molecules, energy transitions and spectroscopy, 43-49 Dicarboxylic acids in particles, 398-400 1,3-Dichloropropene, atmospheric lifetime and fate predictions, 928 Diesel exhaust, control technology and, 923-924; see also PAH and PAC Differential optical absorption spectrometry (DOAS) analysis of spectra, 557 basis of technique, 556-557 detection limits, 559 schematic diagram, 558 typical spectra, 560-561 Diffuse reflectance infrared, Fourier transform spectroscopy, 171-172 Diffusion-controlled reactions in gas phase, 140, 152 of uncharged nonpolar species in solution, 152-153

Diffusion denuder technique, 567-568 Diffusion separator, in particle size measurement, 617 Dimethyl disulfide hydroxyl radical reaction, 333-334 natural emissions, 20-21 nitrate radical reaction, 334 Dimethyl sulfide chorine atom reaction, 332-333 global climate, role in, 328 halogen oxides, reactions with, 333 hydroxyl radical reaction, 328-332 natural emissions, 20-21 nitrate radical reaction, 332 ozone reaction in aqueous solution, 333 Dimethyl sulfone, from hydroxyl radical-sulfur dioxide reaction, 329 Dimethyl sulfoxide from hydroxyl racial-sulfur dioxide reaction, 329

hydroxyl radical, reaction with, 331 Dinitrogen pentoxide absorption spectra, 101 alkenes, reactions with, 281 equilibrium with N02 and NO,, 267 hydrolysis in troposphere, 279-280 indoors, 860 measurement of, 552 photochemistry, 101 reaction with water, 279-280 sea salt, reations with, 280-281 sodium halides, reactions with, 280-281 thermal decomposition, 279 Dinitrogen tetroxide absorption spectra, 96 equilibrium with N02, 95 role in HONO formation, 270 Dinitrogen trioxide, as intermediate in nitrous acid formation, 272 Dissociation energies, bond, see Appendix II Diterpenes, 226

DOAS, see Differential optical absorption spectrometry Dobson units, 657

Droplet diameters, typical for fogs, clouds and rain, 308 Dry powder dispersion for particle generation, 634

Dust particles, 355-356, 381-382, 389, 391-392

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