Vem

Ice core data, 778, 780, 808, 825-828 Impactors, in particle size measurement, 610-611

Index of refraction of typical atmospheric compounds, 366-367 Indoor air pollution aldehydes, formation from VOC-NOA.

chemistry, 860-861 carbon monoxide, 849-850 dinitrogen pentoxide, 860 nitrate radical, 860 nitric acid, 847-848, 860 nitrous acid, 847-849 ozone, 859-861 PAH, 863

particles, concentrations and sources,

861-865 pesticides, 851-852, 858 radon, 844-846 sulfur dioxide, 849-850 volatile organic compounds aldehydes, 856-857, 860, 861 from carpets, 853-856, 858-859 chlorinated compounds, 854, 858 classes, observed, 851 concentrations, 852 formaldehyde, 856-857 ketones, 857, 860-861 organic acids, 857, 861 pesticides, 851-852, 858 sources, 852-858 from smoking, 858-859 Infrared absorption dependence on concentrations in atmosphere, 769-773 by gases, 763-773 by particles, 798-799 by clouds, 764, 815 Infrared spectroscopy, see also Fourier transform infrared spectrometry, tunable diode laser spectrometry, nondis-persive infrared, and matrix isolation spectroscopy measurement of gases, 551-556 of particles, 399-400 Interface reactions, 158, 164-165, 269, 307, 422

Intermolecular nonradiative processes, 51 Internal conversion, of electronically excited molecules, 50 Intersystem crossing, in electronically excited molecules, 50

Intertropical convergence zone, 660 Iodine, I2, absorption spectrum and photochemistry, 113-114 Iodine in sea salt particles, 383 in stratosphere, 706-707, 752-753 Iodine monoxide absorption spectrum and photochemistry,

113-114 dimethyl sulfide reaction, 333 Ionic strength of solutions in atmosphere, 155 definition, 154 Iron, aqueous phase chemistry and photochemistry, 309-311, 316, 325 Irradiance, 62

Isomerization, of alkoxy radicals, 189-191 Isopleths, of ozone concentrations, 882-886,

915 Isoprene chemical structure, 226 emission rates, 226-227 hydroxyl radical reaction, 194-196 nitrate radical reaction, 203-205 nitrogen dioxide reaction, 206 sources and emissions, 225-227

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