F

F, broadening factor of falloff curve, 136 Factor analysis for source apportionment, 387

Falling droplet apparatus for heterogeneous reactions, 167-168 Falloff region, for termolecular rate constants, 135-136 Fast flow systems for rate constant measurements, 142-145 Fenton reaction, for hydroxyl production, 316

Filters ammonia monitoring using, 567 mechanisms of action, 609 nitric acid monitoring, 567 nylon filters in nitric acid monitoring, 567 in particle collection, 608-610 sampling with, 567 types and characteristics, 609 Fine particles chemical composition of, 356-357,

384-412 definition of, 354-356 Flash photolysis systems for rate constant determinations, 145-146 Fluorescence definition of, 50

in measurement techniques, 548 Fluorine chemistry in stratosphere, 671-673, 746-750

fates of fluorinated products of hydrochlo-rofluorocarbon and hydrofluorocar-bon oxidations, 750-753 F2, absorption spectrum and photochemistry, 113-114 tetrafluoromethane, 736, 789 Fogs acid, 323-324 health effects and, 324 smog-fog-smog cycle, 323-324 Formaldehyde absorption spectra, 107-109 in aqueous solution, 303-305 chlorine atom reaction, 214 concentrations in troposphere, 592-593 as a hazardous air pollutant (HAP), 928 Henry's law constant, 304 hydration constant, 304 hydroxyl radical reaction, 214 hydroperoxy radical reaction, 216-217 measurement techniques for, 552, 589-592 nitrate radical reaction, 214 nitric acid reaction, 241 photochemistry of, 107-109 sulfur dioxide reaction, aqueous phase, 303 as a toxic air contaminant (TAC), 928 Formic acid in acid deposition, 326-327 concentrations in troposphere, 326 indoors, 857, 861 measurement of, 552 sources, 327 Fourier transform infrared spectroscopy in atmospheric studies, 551-556 "Fourth phase" in atmospheric chemistry, 164-165

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