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Topics referred to by the same term
Extinction coefficient refers to several different measures of the absorption of light in a medium: Attenuation coefficient, sometimes called "extinction
Extinction_coefficient
Property of materials
in solution chemistry). Mass extinction coefficient is an old term for this quantity. The mass attenuation coefficient can be thought of as a variant
Mass_attenuation_coefficient
Light or sound absorption in a substance
medium. The (derived) SI unit of attenuation coefficient is the reciprocal metre (m−1). Extinction coefficient is another term for this quantity, often used
Attenuation_coefficient
Measure of how strongly a chemical species absorbs a given wavelength of light
M−1⋅cm−1 equals 1000 cm2/mol. The molar absorption coefficient is also known as the molar extinction coefficient and molar absorptivity, but the use of these
Molar_absorption_coefficient
Property in optics
indicates the phase velocity, while the imaginary part κ is called the extinction coefficient indicates the amount of attenuation when the electromagnetic wave
Refractive_index
Range of wavelengths from 650 to 1350 nanometre
properties of the most important chromophores in tissue. The molar extinction coefficient ( ε {\displaystyle \varepsilon \,} ) is another parameter that is
Near-infrared window in biological tissue
Near-infrared_window_in_biological_tissue
Range of spectroscopic analysis
Tyrosine, for example, increases in absorption maxima and molar extinction coefficient when pH increases from 6 to 13 or when solvent polarity decreases
Ultraviolet–visible spectroscopy
Ultraviolet–visible_spectroscopy
Topics referred to by the same term
species) Language extinction, or language death Extinction (another word for attenuation), in physical sciences Extinction coefficient (another term for
Extinction_(disambiguation)
Material science measurement method
Bloomer deduced dispersion equations for the refractive index, n, and extinction coefficient, k, which were published in 1986 and 1988. The 1986 publication
Refractive index and extinction coefficient of thin film materials
Refractive_index_and_extinction_coefficient_of_thin_film_materials
Concept in astrophysics regarding radiation transparency
the integral of the extinction coefficient α ν {\displaystyle \alpha _{\nu }} (the sum of absorption and scattering coefficients) along the radiation
Optical_depth_(astrophysics)
Chemical compound
At wavelength (378 - 382) nm, extinction coefficient > 8000 and at wavelength (298 - 302) nm, the extinction coefficient > 12000. Thymol blue undergoes
Thymol_blue
Meteorological instrumentation
transmissometer or transmissiometer is an instrument for measuring the extinction coefficient of the atmosphere and sea water, and for the determination of visual
Transmissometer
Scientific law describing absorption of light
effect. Thus a scattering coefficient μs and an absorption coefficient μa can be combined into a total extinction coefficient μ = μs + μa. Importantly
Beer–Lambert_law
Chemical compound
which should never be used to prepare solutions of the reagent. The extinction coefficient of dansyl derivatives are important for measuring their concentration
Dansyl_chloride
Physical process by which matter takes up a photon's energy and stores it
Beer–Lambert law) The mass attenuation coefficient (also called "mass extinction coefficient"), which is the absorption coefficient divided by density The absorption
Absorption (electromagnetic radiation)
Absorption_(electromagnetic_radiation)
particular wavelength—thus, the imaginary part is sometimes called the extinction coefficient k {\displaystyle k} . Such losses become particularly significant
List_of_refractive_indices
Chemical compound
5. Below this pH, it is colorless; above, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38,000 M−1 cm−1 at 595 nm
Thymolphthalein
Measure of the distance needed to visually discern an object
Note.— The two distances have different values in air of a given extinction coefficient, and the latter b) varies with the background illumination. The
Visibility
Blue dye also used as a medication
Absorption spectrum of methylene blue, in terms of the molar extinction coefficient (base 10 logarithm). In this dataset, a peak absorbance of 1.7 (i.e
Methylene_blue
Chemical compound
relative/partitioning terms, Alcian Blue 8G has a log octanol-water partition coefficient (Log P) of −9.7, suggesting it is rather water-soluble (lipid-soluble
Alcian_blue_stain
Class of instruments
signal (particle and molecular contributions). Profiles of the extinction coefficient have to be estimated using the molecular signal and the assumption
Atmospheric_lidar
Coenzyme
extinction coefficient of 16,900 M−1cm−1. NADH also absorbs at higher wavelengths, with a second peak in UV absorption at 339 nm with an extinction coefficient
Nicotinamide adenine dinucleotide
Nicotinamide_adenine_dinucleotide
Non-radiative transfer of an excited electron between molecules
integral, where normalized means that both emission intensity and extinction coefficient have been adjusted to unit area. It is important noticed that J
Dexter_electron_transfer
Method to determine protein concentration
absorbance of the standards vs. their concentration. Compute the extinction coefficient and calculate the concentrations of the unknown samples. Prepare
Bradford_protein_assay
Study involving matter and electromagnetic radiation
is the output intensity, ε {\displaystyle \varepsilon } is the extinction coefficient, ℓ {\displaystyle \ell } is the path length through the sample,
Spectroscopy
Tool used to measure water transparency/turbidity
divided by this depth in metres yields an attenuation coefficient (also called an extinction coefficient), for the available light averaged over the Secchi
Secchi_disk
Rare variety of amber resin with a blue color
fluoresced with a greater intensity, even though the absorption extinction coefficient was larger for red and yellow amber. Although there are several
Blue_amber
Property of an object or substance that is impervious to light
percentage of light blocked instead of the attenuation coefficient (aka extinction coefficient) and varies from 0% light blocked to 100% light blocked:
Opacity
Chemical data page for water
constant pressure in kilojoules per kilogram-kelvin γ – Thermal expansion coefficient as 10−3 per kelvin λ – Heat conductivity in milliwatts per meter-kelvin
Water_(data_page)
Nano-scale semiconductor particles
particularly promising for optical applications due to their high extinction coefficient and ultrafast optical nonlinearities with potential applications
Quantum_dot
= absorption coefficient = Na𝜎a; μs = scattering coefficient = Ns𝜎s; g = scattering anisotropy = <cos(𝛳)>; μt = extinction coefficient = μa + μs Where
Collimated transmission theory
Collimated_transmission_theory
Serum albumin protein derived from cows
66,463 Da (= 66.5 kDa) isoelectric point in water at 25 °C: 4.7 Extinction coefficient of 43,824 M−1cm−1 at 279 nm Dimensions: 140 × 40 × 40 Å (prolate
Bovine_serum_albumin
Modelling the appearance of paint coatings
absorption coefficient, s {\displaystyle s} is the back-scatter coefficient, and ϵ {\displaystyle \epsilon } is their sum, often called the extinction coefficient
Kubelka–Munk_theory
Process in molecular biology
the absorbing molecule. At a wavelength of 260 nm, the average extinction coefficient for double-stranded DNA (dsDNA) is 0.020 (μg/mL)−1 cm−1, for single-stranded
Nucleic_acid_quantitation
Genetic mutant of green fluorescent protein
maturation, and increased brightness (defined as the product of the extinction coefficient and quantum yield). Typically, YFP serves as the acceptor for genetically-encoded
Yellow_fluorescent_protein
Fifth letter of the Greek alphabet
ε denotes the axial tilt. In chemistry, it represents the molar extinction coefficient of a chromophore. In economics, ε refers to elasticity. In statistics
Epsilon
solids content by polarimetry, densimetry and refractometry, color (extinction coefficient at 420 nm), reducing sugars, and the presence of metals such as
International Commission for Uniform Methods of Sugar Analysis
International_Commission_for_Uniform_Methods_of_Sugar_Analysis
Non-destructive type of ultrasonics
ultrasonics is based on the photoelastic effect. The refractive index and extinction coefficient near the surface of the solid are perturbed by the returning strain
Picosecond_ultrasonics
Excitation of electrons in a molecule to a higher energy level
135 nm and that of water a n → σ* transition at 167 nm with an extinction coefficient of 7,000. Benzene has three aromatic π → π* transitions; two E-bands
Molecular electronic transition
Molecular_electronic_transition
Branch of spectroscopy
it is necessary to know the extinction coefficient of this mixture at two wavelengths and the extinction coefficients of solutions that contain the
Spectrophotometry
Theoretical model describing the optical response of bound charges
Lefever-Button, G.; Powell, F. R. (1998). "Infrared Refractive Index and Extinction Coefficient of Polyimide Films". International Journal of Thermophysics. 19
Lorentz_oscillator_model
Typographic symbol (underline)
refraction. When the refractive index has a wavelength-dependent extinction coefficient κ {\displaystyle \kappa } , the combined complex index of refraction
Underscore
Amount of air seen through in astronomical observations
calculation of extinction can sometimes be done by using one of the simple air mass formulas and separately determining extinction coefficients for each of
Air_mass_(astronomy)
Massive galaxy in the constellation Boötes
stellar populations. The galaxy is also characterized by a high extinction coefficient, equal to Av ≈ 1.0-1.5 magnitudes. Dense interstellar dust effectively
EGS-z11-R0
Class of dyes
filters for tetramethylrhodamine (TRITC). Due to its high molar extinction coefficient, this dye is also easily detected by naked eye on electrophoresis
Cyanine
Spectroscopic techniques that measure the absorption of radiation
absorption spectrum is typically quantified by the extinction coefficient, and the extinction and index coefficients are quantitatively related through the Kramers–Kronig
Absorption_spectroscopy
Chemical compound
or less efficiently a krypton laser at 567 nm. The absorption extinction coefficient at 596 nm is about 85,000 M−1cm−1. The compound is usually a mixture
Texas_Red
Symbols for constants, special functions
elasticity in economics electromotive force in chemistry, the molar extinction coefficient of a chromophore in mathematics, a surreal number that is bigger
Greek letters used in mathematics, science, and engineering
Greek_letters_used_in_mathematics,_science,_and_engineering
Chemical element with atomic number 44 (Ru)
Robin; Zakeeruddin, Shaik M.; Grätzel, Michael (2006). "High Molar Extinction Coefficient Heteroleptic Ruthenium Complexes for Thin Film Dye-Sensitized Solar
Ruthenium
opposition to the Sun. optical depth Optical depth is a measure of the extinction coefficient or absorptivity up to a specific 'depth' of a star's makeup. orbit
Glossary_of_astronomy
Protein that exhibits bright green fluorescence when exposed to ultraviolet light
allowed the practical use of GFPs in mammalian cells. EGFP has an extinction coefficient (denoted ε) of 55,000 M−1cm−1. The fluorescence quantum yield (QY)
Green_fluorescent_protein
Anion in which a Fe2+ ion is complexed by 6 CN– ions
negligible absorption at this wavelength while ferricyanide has an extinction coefficient of 1040 M−1 cm−1. The dominant use of ferrocyanides is as precursors
Ferrocyanide
with attenuation coefficient; see attenuation coefficient for details; molar absorption coefficient or molar extinction coefficient, also called molar
Mathematical descriptions of opacity
Mathematical_descriptions_of_opacity
Quantum chemistry rule regarding vibronic transitions
the other selection rules. The table below gives the range of extinction coefficients for the possible combinations of allowed and forbidden spin and
Franck–Condon_principle
Method of spatial measurement using laser
and densities of clouds, cloud particle properties (extinction coefficient, backscatter coefficient, depolarization), temperature, pressure, wind, humidity
Lidar
Chemical data page
{\displaystyle \scriptstyle A\times ln(T)+B/T+C+D\times T^{2}} with coefficients A=-2.125867E+01, B=-1.672626E+04, C=1.655099E+02, and D=1.100480E-05
Glycerol_(data_page)
Spectroscopic selection rule
intensities orders of magnitude weaker than "allowed" bands. The extinction coefficients for d-d bands are in the range 5–200 L mol−1 cm−1 . The allowedness
Laporte_rule
Manufacturing process used to create integrated circuits
of gate oxide, as well as the thickness, refractive index, and extinction coefficient of photoresist and other coatings. Wafer metrology equipment/tools
Semiconductor device fabrication
Semiconductor_device_fabrication
Chemical data page
UV-Vis λmax 205 nm Extinction coefficient, ε 100.2 m2/mol IR Major absorption bands 3334, 2970, 1466, 1378, 1160, 1128, 951, 817, 639 cm−1 NMR Proton NMR
Isopropyl_alcohol_(data_page)
Supramolecular structures held together other than by covalent bonds
(chromophores), 𝜀i,𝜆 is the molar absorbance (also known as the extinction coefficient) of the ith chemical species at the wavelength λ {\displaystyle
Host–guest_chemistry
Situation or phenomena, When light bounces off a material with a low index of refraction
taking into account β ( ω ) {\displaystyle \beta (\omega )} as an extinction coefficient shows that the refracted ray penetrates slightly into the material
Total_external_reflection
Form of electromagnetic radiation
surface of a semiconductor wafer, the index of refraction (n) and the extinction Coefficient (k) can be determined via the Forouhi–Bloomer dispersion equations
Infrared
Dimensionless quantity that characterizes plant canopies
factoring in the leaf angle distribution, solar zenith angle, and plant extinction coefficient. Such indirect methods, where LAI is calculated based upon observations
Leaf_area_index
Inelastic scattering of photons by matter
lidar is used in atmospheric physics to measure the atmospheric extinction coefficient and the water vapour vertical distribution. Due to its velocity-selective
Raman_scattering
(cystines). Then the following formula is used to calculate the first extinction coefficient: W*5500 + Y*1490 + cystines*125. This calculation assumes that all
Esculentin-2CHa
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands 2347 and 667 cm−1 (4.26 and 14.99 um) NMR Proton NMR not applicable Carbon-13 NMR
Carbon_dioxide_(data_page)
Feature observed in spectroscopy
to the individual components, k, at concentration, ck. ε is an extinction coefficient. In such cases the curve of experimental data may be decomposed
Spectral_line_shape
Chemical compound
properties. These dyes are usually intensely colored and have large extinction coefficients. Merocyanine 540 was the first fluorescent dye used for measuring
Merocyanine
Chemical data page for ethanol
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands (liquid film) Wave number transmittance 880 cm−1 22% 1048 cm−1 6% 1089 cm−1 19%
Ethanol_(data_page)
Photochemical energy transfer mechanism
ϵ A {\displaystyle \epsilon _{\text{A}}} is the acceptor molar extinction coefficient, normally obtained from an absorption spectrum. The orientation
Förster resonance energy transfer
Förster_resonance_energy_transfer
Property of waves that can oscillate with more than one orientation
medium whose refractive index has a significant imaginary part (or "extinction coefficient") such as metals;[clarification needed] these fields are also not
Polarization_(waves)
Green bile pigment
peroxide and uses the chromophore biliverdin. smURFP has a large extinction coefficient (180,000 M−1 cm−1) and has a modest quantum yield (0.20), which
Biliverdin
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands ? cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main fragments
Sodium_chloride_(data_page)
Photochromic organic chemical compound
Because of the apparent conjugated system after UV illumination the extinction coefficient of the MC-form is significantly higher than that of the closed spiropyran
Spiropyran
Chemical compound
visible light at 412 nm, using an extinction coefficient of 14,150 M−1 cm−1 for dilute buffer solutions, and a coefficient of 13,700 M−1 cm−1 for high salt
Ellman's_reagent
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands 3019, 2917, 1534, 1306 cm−1 NMR Proton NMR Carbon-13 NMR −2.3 ppm Other NMR data
Methane_(data_page)
Amino acid having an aromatic ring
tryptophan. Of the aromatic amino acids, tryptophan has the highest extinction coefficient; its absorption maximum occurs at 280 nm. The absorption maximum
Aromatic_amino_acid
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands ? cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main fragments
Cocaine_(data_page)
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands (liquid film) Wave number transmittance 3347 cm−1 6% 3336 cm−1 8% 2945 cm−1 18%
Methanol_(data_page)
3,4,5-Trihydroxybenzoic acid
UV-Vis Lambda-max: 220, 271 nm (ethanol) Extinction coefficient (log ε) IR Major absorption bands ν : 3491, 3377, 1703, 1617, 1539, 1453, 1254 cm−1 (KBr)
Gallic_acid
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands ? cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main fragments
Butane_(data_page)
Chemical compound
increase the rate of curing. It absorbs very weakly at 468 nm (extinction coefficient of 40 M−1·cm−1) giving it a pale yellow color. Photoexcitation results
Camphorquinone
Automated sensor suites
particles in the air and received by the receiver determines the extinction coefficient. This is then converted to visibility using either Allard's or Koschmieder's
Automated airport weather station
Automated_airport_weather_station
Globular cluster
optical range. The absorbing clouds of dust are not uniform, and the extinction coefficient RV is 2.5, less than the typically assumed value of 3.1. Liller
Liller_1
Organic dye
of the cation results from a strong absorption band at 621 nm (extinction coefficient of 105 M−1 cm−1). Malachite green is prepared by the condensation
Malachite_green
Use of reflected waves to analyze objects and interfaces
dispersion equations can determine the thickness, refractive index, and extinction coefficient of thin films utilized in the semiconductor industry. X-ray reflectometry:
Reflectometry
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands 974 cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main fragments
Ethylene_(data_page)
Possible dwarf planet
the size of their ice grains. Because water ice has a very high extinction coefficient at 3 μm, the absorption band at that wavelength is nearly 100% optically
120347_Salacia
Large animals
extinctions, which is unprecented in previous extinctions during the last 30 million years. Various theories have attributed the wave of extinctions to
Megafauna
Protein used by plants, bacteria and fungi to detect light
phytochrome chromophore absorbs light exceedingly efficiently, showing an extinction coefficient of about 100 mM-1 cm-1 (10,000-fold greater than that of Cu(SO4)2
Phytochrome
Coenzyme
local absorbance maximum for FAD is observed at 450 nm, with an extinction coefficient of 11,300 M−1 cm−1. Flavins in general have fluorescent activity
Flavin_adenine_dinucleotide
Chemical data page
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands 1055–1000 cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main
Cyclohexane_(data_page)
Organic chemical compound
Et2O can be determined spectrophotometrically at 410 nm where its extinction coefficient, ε, is 7.2. The gas-phase concentration of diazomethane can be determined
Diazomethane
2007, Comparison of leaf angle distribution functions: effects on extinction coefficient and sunlit foliage, Agricultural and Forest Meteorology, 2007, Vol
Leaf_angle_distribution
Class of copper-containing proteins
intense blue coloration. Specifically, λmax = 16,000 cm-1, molar extinction coefficient (ε) ∼5000 M-1cm-1. They serve as electron transfer agents, with
Copper_protein
German Jewish mathematician, physicist, and chemist (1825–1863)
centimeters, and ε is a constant of proportionality known as the molar extinction coefficient. The law is accurate only for dilute solutions; deviations from
August_Beer
Blue-colored dye
Trypan blue is also known as diamine blue and Niagara blue. The extinction coefficient for trypan blue is 6⋅104 M−1 cm−1 at 607 nm in methanol. Trypan
Trypan_blue
Observation of distant objects on Earth's surface or terrestrial features
As twilight progresses most of the atmospheric aerosols have an extinction coefficient decreasing in magnitude with increasing wavelength. The moonlight
Long_distance_observations
Secondary metabolite
UV-Vis Lambda-max: 276 nm Extinction coefficient (log ε) 4.01 IR Major absorption bands 1600 cm−1(benzene rings) NMR Proton NMR (500 MHz, CD3OD): Reference
Catechin
Optical technique for characterizing thin films
manufacturing because a library of known Refractive index (n) and Extinction coefficient (k) for the materials used during manufacturing can be developed
Ellipsometry
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EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
EXTINCTION COEFFICIENT
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