Gold Book Terms

'A' valueA-factorab initio calculationsab initio quantum mechanical methodsabatement in atmospheric chemistryabeo-abiologicalabioticabiotic transformationabsolute activation analysisabsolute activity, λabsolute configurationabsolute counting in radioanalytical chemistryabsolute electrode potentialabsolute full energy peak efficiencyabsolute lethal concentration (LC100)absolute lethal dose (LD100)absolute photopeak efficiencyabsolute preconcentration in trace analysisabsorbance matching in spectrochemical analysisabsorbance, Aabsorbed (spectral) photon flux densityabsorbed (spectral) radiant power densityabsorbed dose of a substanceabsorbed dose of radiation, Dabsorbed electron coefficient in in situ microanalysisabsorbed electrons in in situ microanalysisabsorberabsorptance, αabsorptionabsorption coefficientabsorption coefficient in biologyabsorption cross-section, σabsorption factorabsorption intensityabsorption lineabsorption pathlength, of a sample cellabsorption spectrumabsorptivityabstractionabstraction process in catalysisabundance sensitivity in mass spectrometryacaccelerating voltage (high voltage, V) scan in mass spectrometryacceleration energy in in situ microanalysisacceleration of free fall, gacceleration, aaccelerator in solvent extractionacceptable daily intake (ADI)acceptable daily intake (ADI)acceptor number (AN)accommodation coefficientaccretion in atmospheric chemistryaccuracy of a measuring instrumentaccuracy of measurementacenesacetalsacetogeninsacetonidesacetylene blackacetylenesacetylidesAcheson graphiteachiralachirotopicaci-nitro compoundsacidacid anhydridesacid deposition in atmospheric chemistryacid rain in atmospheric chemistryacid thioanhydridesacid-labile sulfuracid–base indicatoracid–base titrationacidimetric titrationacidityacidity constantacidity functionacidosisactinicactinic flux Sλactinismactinometeraction spectrumactivated adsorption processactivated carbonactivated charcoalactivated complexactivationactivation analysis (nuclear)activation cross-sectionactivation energy (Arrhenius activation energy)activation in electrochemical corrosionactivation in radiochemistryactivation reactionactivatoractive centreactive mediumactive metal in electrochemical corrosionactive site in heterogeneous catalysisactive solidactive speciesactive state in electrochemical corrosionactive transport in biologyactivityactivity (relative activity), aactivity coefficient, f, γactivity, A of a radioactive materialacute toxicityacyl anionsacyl carbenesacyl cationsacyl groupsacyl halidesacyl radicalsacyl shift (1,2-, 1,3-, photochemical)acyl speciesacylalsacylium ionsacyloinsacyloxyl radicalsadded hydrogenaddendadditionaddition reactionadditiveadditive nameadditivity of mass spectraadditivity principleadductadduct ion in mass spectrometryadhesional wettingadiabaticadiabatic electron transferadiabatic ionization in mass spectrometryadiabatic lapse rate in atmospheric chemistryadiabatic photoreactionadiabatic transition-state theoryadiabatic treatments of reaction ratesadjacent re-entry model in polymer crystalsadjusted retention volume adjuvantADMRadsorbateadsorbentadsorberadsorptionadsorption capacityadsorption chromatographyadsorption complexadsorption currentadsorption hysteresisadsorption indicatoradsorption isobaradsorption isostereadsorption isothermadsorption isotherm in chromatographyadsorptiveadvancementadvection in atmospheric chemistryadverse effectaeration in atmospheric chemistryaerobeaerobicaerobic conditionsaerogelaeromete in atmospheric chemistryaerometric measurement in atmospheric chemistryaerosolaerosol hydrolysisaffine chain behaviouraffinity chromatographyaffinity of reaction, Aafter mass analysis in mass spectrometryageing of precipitateagglomerate in catalysisagglomerate in polymer scienceagglomeration (except in polymer science)agglomeration in polymer scienceagglutinationaggregate in catalysisaggregation (except in polymer science)aging (ageing) of a polymeraglycon (aglycone)agonistagosticagostic interactionagranular carbonair contaminant in atmospheric chemistryair mass in atmospheric chemistryair monitoring station in atmospheric chemistryair pollutantair pollutionair pollution index (air quality index)air pollution survey in atmospheric chemistryair quality characteristic in atmospheric chemistryair resource management in atmospheric chemistryair sampling network in atmospheric chemistryair-lift bioreactorAitken particlesalbedoalbuminalcogelalcoholatesalcoholsalcoholysisaldaric acidsaldazinesaldehydesaldiminesalditolsaldoketosesaldonic acidsaldosesaldoximesalert levels in atmospheric chemistryalicyclic compoundsaliphatic compoundsaliquot in analytical chemistryalkalimetric titrationalkaloidsalkalosisalkanesalkanium ionsalkene photocycloadditionalkene photodimerizationalkene photoisomerizationalkene photorearrangementalkenesalkoxidesalkoxyaminesalkyl groupsalkyl radicalsalkylenesalkylidene groupsalkylideneamino carbenesalkylideneaminoxyl radicalsalkylideneaminyl radicalsalkylidenesalkylidynesalkynesalleleallenesallo- in amino-acid nomenclatureallometricallosteric enzymesallosteryallotriomorphic transitionallotropesallotropic transitionallylic groupsallylic intermediatesallylic substitution reactionalternancy symmetryalternantalternating copolymeralternating copolymerizationalternating currentalternating voltagealtocumulus cloud in atmospheric chemistryaltostratus cloud in atmospheric chemistryAM 0 sunlightAM 1 sunlightamalgam lampambidentambient air in atmospheric chemistryambient air quality in atmospheric chemistryamboAmes/salmonella testamic acidsamide hydrazonesamide oximesamidesamidinesamidium ionsamidrazonesaminalsamine imidesamine iminesamine oxidesamine ylidesaminesaminimidesaminium ionsaminiumyl radical ionsamino radicalsamino sugarsamino-acid residue in a polypeptideaminonitrenesaminooxyl radicalsaminoxidesaminoxyl radicalsaminyl oxidesaminyl radicalsaminylenesaminylium ionsammonium compoundsammonium iminesammonium ylidesammoniumyl radical ionsamorphous carbonamount concentration, camount fraction, x (y for gaseous mixtures)amount of substance, namount-of-substance concentrationamount-of-substance fraction, xampereamperometric detection method in electrochemical analysisamphipathicamphiphilicamphiprotic (solvent)ampholytesampholytic polymeramphotericamplification reactionamplitude of alternating currentamplitude of alternating voltageanabolismanaerobeanaerobicanaestheticanalgesicanalogue metabolismanalogue to digital converter (pulse)analyteanalytical functionanalytical instrumentanalytical intercomparisonanalytical portionanalytical pyrolysisanalytical quality controlanalytical radiochemistryanalytical sampleanalytical solutionanalytical solution calorimetryanalytical unit (analyser)anationanchimeric assistanceaneroid barometerAnger cameraangleangle of observationangle of optical rotation, αangle strainangular distributionangular frequency, ωangular momentum, Langular overlap model (AOM)anhydridesanhydro basesanilidesanilsanionanion exchangeanion exchangeranion radicalanion-exchange polymeranionic polymeranionic polymerizationanionotropic rearrangement (or anionotropy)anisometricanisotropyannelationannihilationannulationannulenesannulenylidenesanodeanodic transfer coefficientanomeric effectanomersansa compoundsantagonismantagonistantarafacialanthelmint(h)icanthocyanidinsanthocyaninsantianti-Compton γ-ray spectrometeranti-Hammond effectanti-Markownikoff additionanti-Stokes shiftanti-Stokes type radiation (fluorescence)anti-thixotropyantiaromatic compoundsantiaromaticity (antithetical to aromaticity)antibioticantibodyantibonding molecular orbitalanticholinergicanticircular elution (anticircular development) in planar chromatographyanticlinalanticlined structures in polymersanticodonanticyclone in atmospheric chemistryantiferroelectric transitionantiferromagnetic transitionantigenantihelminthantimetaboliteantimony–xenon lamp (arc)antimycoticantiparticleantiperiplanarantipodesantiprismo-antiresistantantiserumantisymmetry principleapapexapex currentapex potentialaphicideapical (basal, equatorial)apicophilicityapo- in carotenoid nomenclatureapoenzymeapoproteinapoptosisapparent (quantity)apparent lifetimeapparent viscosity, of a liquidappearance energy (appearance potential)appearance potentialappearance temperaturein electrothermal atomization, Tappapplied potentialaprotic (solvent)aquagelaquationarachno-Archibald's methodarea of an electrode-solution interfacearea of interfacearea viscosityareicarene epoxidesarene oxidesarenesarenium ionsarenolsarenonium ionsargon ion laserarithmetic mean (average)aromaticaromatic photocycloadditionaromaticityarrester in atmospheric chemistryArrhenius A factorArrhenius energy of activationArrhenius equationarsanesarsanylidenesarsanylium ionsarsenidesarsine oxidesarsinesarsinic acidsarsinidenesarsinous acidsarsonic acidsarsonium compoundsarsonous acidsarsoranesartificial graphiteartificial neural networksartificial radioactivityaryl cationsaryl groupsarylene groupsaryneascending elution (ascending development) in planar chromatographyash in atmospheric chemistryashing in analysisaspiratorassayassay kitassociationassociation reaction (associative combination)in mass spectrometryassociative desorptionassociative ionization in mass spectrometryassociative surface reactionasym-asymmetricasymmetric carbon atomasymmetric centreasymmetric destructionasymmetric filmasymmetric inductionasymmetric membraneasymmetric photochemistryasymmetric synthesisasymmetric transformationasymmetryasymmetry potential of a glass electrodeatactic macromoleculeatactic polymeratmosphereatmosphere of the earthatmospheric pressure ionization in mass spectrometryatomatom-atom polarizabilityatom-bond polarizabilityatom–molecule complex mechanismatomic chargeatomic fluorescenceatomic laseratomic mass constantatomic mass maatomic mass unitatomic number, Zatomic orbital, ψ, φ, χatomic ring-sectoratomic spectral linesatomic symbolatomic unitsatomic weightatomization in analytical flame spectroscopyatomization surface temperaturein electrothermal atomization, Tsatomizeatomizer in analytical flame spectroscopyatropisomersattachmentattenuance filterattenuance, Dattenuationattenuation coefficientattoattractive potential-energy surfaceattractive–mixed–repulsive (AMR) classificationattributable riskaufbau principleAuger effectAuger electronAuger electron spectroscopyAuger electron yieldAuger yieldautacoidauto-ionization in mass spectrometryautocatalytic reactionautomation in analysisautomerizationautophobicityautopoisoning in catalysisautoprotolysisautoprotolysis constantautoradiographautoradiolysisauxiliary electrodeauxochromeauxotrophyavalanche photodiodeaverage current densityaverage degree of polymerizationaverage life in nuclear chemistryaverage rate of flow in polarographyAvogadro constantavoided crossing of potential-energy surfacesAvrami equationaxial (equatorial)axial chiralityaxialite in polymer crystalsaxis of chiralityaxis of helicityaza-di-π-methane rearrangementazacarbenesazaminesazanesazenesazidesaziminesazinesazinic acidsazlactonesazo compoundsazo imidesazo ylidesazomethine imidesazomethine oxidesazomethine ylidesazomethinesazonic acidsazoxy compoundsazylenesα (alpha), β (beta)α-addition (alpha-addition)α-cleavage (alpha-cleavage)α-decay (alpha-decay)α-effectα-eliminationα-oxo carbenesα-particle (alpha-particle)π-adductσ-adduct