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IUPAC Compendium of Chemical Terminology

 

[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M]
[N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]

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alpha- (beta-, gamma-) ray spectrometer
gamma-radiation
gamma-ray spectrometer
RF value (in chromatography)
RM value (in planar chromatography)
rabbit
rac
racemate
racemic
racemic compound
racemic conglomerate
racemic mixture
racemization
racemo structures (in polymers)
rad
radial development
radial electrostatic field analyser (in mass spectrometry)
radial elution (radial development) or circular elution (circular development) (in planar chromatography)
radian
radiance, L
radiant emittance
radiant energy, Q
radiant energy density, rho
radiant exitance, M
radiant exposure, H
radiant flux
radiant (energy) flux, P, phi
radiant intensity
radiant power, P, phi
radiant quantities
radiation
radiation chemistry
radiation constants
radiation continuum (in spectrochemistry)
radiation counter
radiation detector
radiation hazard
radiationless deactivation (decay)
radiationless transition
radiation spectrum
radiation reaction
radiative absorption (in spectrochemistry)
radiative capture
radiative de-excitation (in spectrochemistry)
radiative energy transfer
radiative lifetime
radiative transition
radical (free radical)
radical anion
radical cation
radical centre(s)
radical combination
radical copolymerization
radical disproportionation
radical ion
radical pair (geminate pair)
radical polymerization
radicofunctional name
radioactive
radioactive age
radioactive chain
radioactive contamination
radioactive cooling
radioactive dating
radioactive decay
radioactive equilibrium
radioactive fallout
radioactive half life
radioactive series
radioactive source
radioactive tracer
radioactive tracer technique (in analysis)
radioactive waste
radioactivity
radioanalytical chemistry
radiochemical activation analysis
radiochemical purification
radiochemical purity
radiochemical separation
radiochemical yield
radiochemistry
radiochromatograph
radiocolloid
radioenzymatic assay
radiograph
radiogravimetric analysis
radioimmunoassay
radioiodination
radioisotope
radioisotope dilution analysis
radioisotope induced X-ray emission analysis
radioluminescence
radiolysis
radiometric analysis
radiometric titration
radiometry
radionuclide
radionuclidic purity
radioreceptor assay
radiorelease analysis
radiosonde
radius of gyration, s
raffinate
rain out (in atmospheric chemistry)
random coil (in polymers)
random coincidence (in nuclear chemistry)
random copolymer
random copolymerization
random error
random sample
range (in analysis)
range of measurement (of an analyser)
Raoult's law
rate
rate coefficient
rate constant, k
rate-controlling step
rate-determining step (rate-limiting step)
rate law (empirical differential rate equation)
ratemeter (in radiochemistry)
rate of appearance
rate of change of a quantity
rate of change ratio
rate of consumption
rate of conversion
rate of disappearance
rate of fluid consumption (in flame emission and absorption spectrometry)
rate of formation
rate of liquid consumption (in flame spectroscopy)
rate of migration (in electrophoresis), v
rate of nucleation
rate of reaction, v
ratio
raw coke
Rayleigh ratio
Rayleigh scattering
rayon-based carbon fibres
reactance, X
reactant
reacting bond rules
reaction
reaction barrier
reaction chromatography
reaction coordinate
reaction cross-section
reaction dynamics
reaction intermediate
reaction mechanism
reaction path
reaction path degeneracy
reaction probability
reaction stage
reaction step
reaction time
reactive (reactivity)
reactive adsorption
reactive blending
reactive complex
reactive desorption
reactive polymer
reactive scattering
reactivity index
reactivity-selectivity principle (RSP)
readability (of a balance)
reading
reagent
real (electrified) interphase
real potential of a species in a phase
real surface (interface) area
rearrangement
rearrangement ion (in mass spectrometry)
rearrangement stage
rebound reaction
receptor (1992, 64, 164)
receptor (2004, 76, 1067)
receptor (in drug design)
recognition site
recoil (in radioanalytical chemistry)
recoil-free fraction (in Mossbauer spectrometry)
recoil labelling
recombinant DNA technology
recombination fluorescence
reconstructive transition
recovery
recovery factor (in an extraction process)
recrystallization
redox ion exchangers
redox polymer (2004, 76, 897)
redox polymers (1993, 65, 855)
redox potential
red shift
reduced adsorption
reduced limiting sedimentation coefficient
reduced mass, mu
reduced mobile phase velocity (in chromatography), v
reduced osmotic pressure
reduced sample
reduced sedimentation coefficient
reduced species
reduced viscosity (of a polymer)
reducing (in analytical chemistry)
reduction
reductive elimination
reductones
re-extraction
referee sample
reference atom (in organic reaction mechanisms)
reference cell (or blank cell)(in spectrochemical analysis)
reference dose (RfD)
reference electrode
reference material
reference method
reference procedure (in analysis of trace air constituents)
reference state (of an element)
reference value pH standard
reflectance, rho
reflection electron energy loss spectroscopy (REELS)
reflection factor
reflection high energy electron diffraction (RHEED)
refraction effects
refractive index, n
refractive index increment (in polymer chemistry)
regeneration (of a catalyst)
regioselectivity (regioselective)
regression analysis
regular block (in a polymer)
regular coke
regular comb macromolecule
regular macromolecule
regular oligomer molecule
regular polymer
regular single-strand polymer
regular star macromolecule
regulator gene
Reissert compounds
rel
relative
relative activity
relative adsorption
relative atomic mass (atomic weight), Ar
relative biological effectiveness (of radiation)
relative configuration
relative counting (in nuclear chemistry)
relative density, d
relative detection limit
relative electrode potential
relative elongation
relative error
relative hardness
relative humidity
relative local current density
relative micellar mass
relative molar mass
relative molecular mass
relative permeability
relative permittivity
relative preconcentration (in trace analysis)
relative responsivity
relative retardation (in planar chromatography), Rrel
relative retention (in column chromatography), r
relative selectivity (in catalysis)
relative spectral responsivity
relative standard deviation
relative uncertainty
relative viscosity
relative viscosity increment
relative volumic mass
relativistic effects
relaxation
relaxation kinetics
relaxation time
releaser (in analytical flame spectroscopy)
rem
Renner-Teller effect
reorganization (in polymers)
reorganization energy, lambda
repeatability
(chain) repeating distance
repeating distance
repetency
replacement name
replacement operation (in organic nomenclature)
replicate (duplicate) sample
replication
report (in analysis)
reprecipitation
representative sample
repression
reproducibility
repulsive potential-energy surface
reserve sample
Re, Si
residence time
residence time (hydraulic retention time) (in biotechnology), tr
residual current
residual fuel/oil
residual liquid junction (potential) error (in pH measurement)
residual spectrum/background spectrum (in mass spectrometry)
resin
resistance, R
resistivity, rho
resist polymer
resolution (in gas chromatography)
resolution (in mass spectroscopy)
resolution (in optical spectroscopy)
resolution (in stereochemistry)
resolving power (in mass spectrometry)
resolving power (in optical spectroscopy), R
resolving time (in nuclear analytical chemistry)
resolving time correction (in nuclear analytical chemistry)
resonance
resonance absorption technique
resonance broadening (of a spectral line)
resonance cross-section (in Mossbauer spectrometry)
resonance effect
resonance effect magnitude (in Mossbauer spectrometry)
resonance emission
resonance energy
resonance energy (in radiochemistry)
resonance fluorescence
resonance fluorescence technique
resonance hybrid
resonance integral
resonance integral (in radiochemistry)
resonance lamp
resonance line (in photochemistry)
resonance line (in X-ray spectroscopy)
resonance neutrons
resonance radiation
response constant (in electroanalytical chemistry)
response time (of a detector),
response time (of an analyser)
responsivity (in detection of radiation), R
rest point (of a balance)
restricted rotation
restriction enzymes
result (in analysis)
retardation factor (in column chromatography), R
retardation factor (in planar chromatography), RF
retarder
retentate
retention (in nuclear chemistry)
retention efficiency (in particle separation)
retention factor (in column chromatography)
retention index (in column chromatography)
retention of configuration
retention temperature (in chromatography)
retention time (in chromatography)
retention volumes (in chromatography)
reticulation (in catalysis)
retinoids
retro
retroaddition
retrocycloaddition
retro-ene reaction
reversed direct-injection burner (in analytical flame spectroscopy)
reversed (radiochemical) isotope dilution analysis
reversed-phase chromatography
reverse micelle (or reversed micelle)
reverse osmosis
reverse transcriptases
reversible transition
revolutions per minute (rpm)
rheology
rheopexy
rhodamine dyes
rhombohedral graphite
ribbon delocalisation
ribonucleic acids (RNA)
ribonucleotides
ribosomal RNA (rRNA)
ribosomes
Rice-Ramsperger-Kassel (RRK) theory
Rice-Ramsperger-Kassel-Marcus (RRKM) theory
riffling (in analytical chemistry)
rigid chain
ring assembly
Ringelmann chart (in atmospheric chemistry)
ring-opening copolymerization
ring-opening polymerization
ring reversal (ring inversion)
ring-sector
rise time (of a radiation detector)
rise time (of an analyser)
(vertical) rise velocity (in flame emission and absorption spectrometry)
risk
risk assessment
risk estimation
Ritchie equation
RNA
rod-like morphology
rontgen
root-mean-square end-to-end distance (in polymers), r2>>
Rosanoff convention
rotamer
rotational barrier
rotational constants
rotational diffusion
rotational diffusion coefficient
rotational frequency (in centrifugation), frot
rotational term, F
rotator phase transition
rotatory power
rotaxanes
rotenoids
rotometer (in atmospheric chemistry)
roughness factor (rugosity) (of a surface)
rovibronic state
rRNA
RS
R, S
r, s
R*, S*
Rp, Sp
rubredoxin
ruby laser
rupture (of a thin film)
Rutherford backscattering (RBS)
Rydberg constant
Rydberg orbital
Rydberg state
Rydberg transition
RYDMR

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