clone, 280 closed shell molecular systems, 280 closed system in spectrochemical analysis , 280 closo -, 281 cloud in atmospheric chemistry , 281 cluster, 281 cluster analysis, 281cluster ion in mass spectrometry, 281 co-ions, 282 co-oligomer, 282 co-oligomerization, 282 co-solvency in polymers , 282 coacervation, 282 coagulation (flocculation) in colloid chemistry , 283 coal tar pitch, 283 coal-derived pitch coke, 283 coalescence in colloid chemistry , 284 coalification, 284 codon, 284 coefficient, 284 coefficient of haze ( ) in atmospheric chemistry , 285 coenzyme, 285 coextraction, 285 cofactors, 285 coherence length, in thin films, 286 coherent (derived) unit of measurement , 286 coherent radiation, 286 coherent scattering, 287 coherent source in spectrochemistry, 287 coherent structure, 287 coherent system of units of measurement , 287 coincidence circuit, 288 coincidence resolving time, 288 coke, 288 coke breeze, 288 coking, 288 col (saddle point), 289 cold neutrons, 289 collection, 289 collection efficiency in atmospheric chemistry , 289 collection gas flow system in spectrochemical analysis , 290 collector in atmospheric chemistry, 290 collector (scavenger), 290 colligation, 290 collimation, 290 collimator, 291 collinear reaction, 291 collision complex, 291 collision cross-section, , 291 collision density, , 291 collision diameter, , 292 collision efficiency, , 292 collision frequency, , 292