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Spectroscopic techniques that measure the absorption of radiation
Absorption spectroscopy is spectroscopy that involves techniques that measure the absorption of electromagnetic radiation, as a function of frequency or
Absorption_spectroscopy
Type of spectroanalytical procedure
Atomic absorption spectroscopy (AAS) is an elemental analysis method for determining the concentration of metals in a given sample. The principle of AAS
Atomic absorption spectroscopy
Atomic_absorption_spectroscopy
Range of spectroscopic analysis
Ultraviolet–visible spectrophotometry (UV–Vis or UV-VIS) refers to absorption spectroscopy or reflectance spectroscopy in part of the ultraviolet and the full, adjacent
Ultraviolet–visible spectroscopy
Ultraviolet–visible_spectroscopy
Synchrotron radiation-based spectroscopy
X-ray absorption spectroscopy (XAS) is a set of advanced techniques used for probing the local environment of matter at atomic level and its electronic
X-ray_absorption_spectroscopy
Technique for measuring chemical composition of a gas
Tunable diode laser absorption spectroscopy (TDLAS, sometimes referred to as TDLS, TLS or TLAS) is a technique for measuring the concentration of certain
Tunable diode laser absorption spectroscopy
Tunable_diode_laser_absorption_spectroscopy
Table listing infrared absorption peaks for various bonds
An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported
Infrared spectroscopy correlation table
Infrared_spectroscopy_correlation_table
Study involving matter and electromagnetic radiation
astronomical distances. Historically, spectroscopy originated as the study of the wavelength dependence of the absorption by gas phase matter of visible light
Spectroscopy
Gamma radiation measurement technique
Total absorption spectroscopy is a measurement technique that allows the measurement of the gamma radiation emitted in the different nuclear gamma transitions
Total_absorption_spectroscopy
Measurement of atomic transition frequency
Saturated absorption spectroscopy measures the transition frequency of an atom or molecule between its ground state and an excited state, typically to
Saturated absorption spectroscopy
Saturated_absorption_spectroscopy
about −50 degrees Celsius. Dielectric spectroscopy Differential optical absorption spectroscopy Hydroxyl ion absorption in optical fiber Water model John
Electromagnetic absorption by water
Electromagnetic_absorption_by_water
Physical process by which matter takes up a photon's energy and stores it
absorption are ultraviolet–visible spectroscopy, infrared spectroscopy, and X-ray absorption spectroscopy. Understanding and measuring the absorption
Absorption (electromagnetic radiation)
Absorption_(electromagnetic_radiation)
Spectroscopic technique
Transient-absorption spectroscopy (TAS), also known as flash photolysis, is an extension of absorption spectroscopy. Ultrafast transient absorption spectroscopy
Time-resolved_spectroscopy
In atmospheric chemistry, differential optical absorption spectroscopy (DOAS) is used to measure concentrations of trace gases. When combined with basic
Differential optical absorption spectroscopy
Differential_optical_absorption_spectroscopy
Technique to analyze the infrared spectrum of matter
Fourier transform infrared spectroscopy (FTIR) is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid, or gaseous
Fourier-transform infrared spectroscopy
Fourier-transform_infrared_spectroscopy
Measure of how strongly a chemical species absorbs a given wavelength of light
"Gold Book") (2025). Online version: (2006–) "Absorptivity". doi:10.1351/goldbook.A00044 "Molecular Spectroscopy" (PDF). Compendium on Analytical Nomenclature
Molar_absorption_coefficient
Spectroscopic technique
the nearly recoil-free emission and absorption of nuclear gamma rays in solids. The consequent nuclear spectroscopy method is exquisitely sensitive to
Mössbauer_spectroscopy
Optical spectroscopic technique
trillion level. The technique is also known as cavity ring-down laser absorption spectroscopy (CRLAS). A typical CRDS setup consists of a laser that is used
Cavity_ring-down_spectroscopy
Physics measurement techniques
inconvenient mathematical treatment. The Self Excited Electron Plasma Resonance Spectroscopy (SEERS) utilizes exactly these nonlinear effects and known resonance
Plasma_diagnostics
Spectroscopy based on time- or space-domain data
method of Fourier-transform spectroscopy can also be used for absorption spectroscopy. The primary example is "FTIR Spectroscopy", a common technique in chemistry
Fourier-transform spectroscopy
Fourier-transform_spectroscopy
Type of electromagnetic spectroscopy
A complementary technique is absorption spectroscopy. In the special case of single molecule fluorescence spectroscopy, intensity fluctuations from the
Fluorescence_spectroscopy
interactions. The most common technique is tunable diode laser absorption spectroscopy (TDLAS) which has become commercialized and is used for a variety
Laser_absorption_spectrometry
Electrochemical processes involving photons and the emission or absorption of light
intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across
Photoelectrochemical_process
Two-dimensional electronic spectroscopy (2DES) is an ultrafast laser spectroscopy technique that allows the study of ultrafast phenomena inside systems
Two-dimensional electronic spectroscopy
Two-dimensional_electronic_spectroscopy
Gas in scattering media absorption spectroscopy (GASMAS) is an optical technique for sensing and analysis of gas located within porous and highly scattering
Gas in scattering media absorption spectroscopy
Gas_in_scattering_media_absorption_spectroscopy
Measurement of infrared radiation's interaction with matter
Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) is the measurement of the interaction of infrared radiation with matter by absorption, emission
Infrared_spectroscopy
Scientific law describing absorption of light
spectroscopy Atomic absorption spectroscopy Absorption spectroscopy Cavity ring-down spectroscopy Clausius–Mossotti relation Infra-red spectroscopy Job
Beer–Lambert_law
Measurement of X-ray absorption of a material as a function of energy
X-ray absorption fine structure (EXAFS), along with X-ray absorption near edge structure (XANES), is a subset of X-ray absorption spectroscopy (XAS).
Extended X-ray absorption fine structure
Extended_X-ray_absorption_fine_structure
Optical density of a sample measured at 600 nm
measurements results from light scattering by particles (cells) rather than absorption, size and shape as well as dead cells and debris of a cell may add to
OD600
Spectroscopy of quantized rotational states of gases
polar molecules can be measured in absorption or emission by microwave spectroscopy or by far infrared spectroscopy. The rotational spectra of non-polar
Rotational_spectroscopy
broad band cavity enhanced absorption spectroscopy (IBBCEAS), sometimes called broadband cavity enhanced extinction spectroscopy (IBBCEES), measures the
Incoherent broad-band cavity-enhanced absorption spectroscopy
Incoherent_broad-band_cavity-enhanced_absorption_spectroscopy
Instrument to measure light intensity
where they are used in absorption spectroscopy to calculate the concentration of substances in a solution, infrared spectroscopy to study the structure
Photometer
Analytical method
used in ultraviolet–visible spectroscopy. Early practitioners of IR spectroscopy, who depended on assignment of absorption bands to specific bond types
Near-infrared_spectroscopy
Forensic application of the study of chemistry
gas chromatography-mass spectrometry, atomic absorption spectroscopy, Fourier transform infrared spectroscopy, and thin layer chromatography. The range of
Forensic_chemistry
Technique to characterize materials using X-ray radiation
Elvatech Ltd. and SPECTRA. X-ray absorption spectroscopy X-ray magnetic circular dichroism Auger electron spectroscopy X-Ray Spectrometry (journal) Haschke
X-ray_spectroscopy
Range on the electromagnetic spectrum
In spectroscopy, an absorption band is a range of wavelengths, frequencies or energies in the electromagnetic spectrum that are characteristic of a particular
Absorption_band
Specific structure observed in X-ray absorption spectroscopy
X-ray absorption fine structure (XAFS) is a specific structure observed in X-ray absorption spectroscopy (XAS). By analyzing the XAFS, information can
X-ray absorption fine structure
X-ray_absorption_fine_structure
Investigation of unlawful nuclear materials and their proliferation
requirement of a nuclear reactor for sample preparation. X-Ray absorption spectroscopy (XAS) has been demonstrated as a technique for nuclear forensic
Nuclear_forensics
Spectral lines in the Sun's spectrum
The Fraunhofer lines are a set of spectral absorption lines. They are dark absorption lines, seen in the optical spectrum of the Sun, and are formed when
Fraunhofer_lines
A multiple-pass or long path absorption cell is commonly used in spectroscopy to measure low-concentration components or to observe weak spectra in gases
Multipass spectroscopic absorption cell
Multipass_spectroscopic_absorption_cell
Photothermal spectroscopy is a group of high sensitivity spectroscopy techniques used to measure optical absorption and thermal characteristics of a sample
Photothermal_spectroscopy
Type of X-ray absorption spectrometry requiring a synchrotron radiation facility
X-ray absorption near edge structure (XANES), also known as near edge X-ray absorption fine structure (NEXAFS), is a type of absorption spectroscopy that
X-ray absorption near edge structure
X-ray_absorption_near_edge_structure
Spectroscopy technique
reflectance spectroscopy, or diffuse reflection spectroscopy, is a subset of absorption spectroscopy. It is sometimes called remission spectroscopy. Remission
Diffuse reflectance spectroscopy
Diffuse_reflectance_spectroscopy
Analytical method using radiation to identify chemical elements in a sample
Atomic absorption spectroscopy Atomic spectroscopy Glow-discharge optical emission spectroscopy Inductively coupled plasma atomic emission spectroscopy Laser-induced
Atomic_emission_spectroscopy
Mmeasures the probability of an absorption process
Beer–Lambert law High energy X-rays Attenuation coefficient Absorption spectroscopy "Two-Photon Absorption Measurements: Establishing Reference Standards" (PDF)
Absorption_cross_section
Study of electromagnetic radiation absorbed/emitted by atoms
optical spectroscopy is often less expensive and has performance adequate for many tasks, it is far more common.[citation needed] Atomic absorption spectrometers
Atomic_spectroscopy
Logarithm of ratio of incident to transmitted radiant power through a sample
absorbing species. Consequently, this is often referred to as absorption spectroscopy, and the plotted quantity is called "absorbance", symbolized as
Absorbance
Method of determining chemical concentration
A Duboscq colorimeter, 1870, which allowed visual comparison of the absorptions in two columns of fluids while adjusting their depths
Colorimetric_analysis
Spectroscopic selection rule
The Laporte rule is a rule that explains the intensities of absorption spectra for chemical species. It is a selection rule that rigorously applies to
Laporte_rule
Spectroscopic sensor
filter to select a narrow band spectral region that correspond to the absorption region of the gas of interest. In this context, the narrow band can be
Nondispersive_infrared_sensor
Analytical methodology in spectroscopy
Operando spectroscopy is an analytical methodology wherein the spectroscopic characterization of materials undergoing reaction is coupled simultaneously
Operando_spectroscopy
Type of dye
type of dye with an absorption band that shifts to a longer wavelength (bathochromic shift) of increasing sharpness (higher absorption coefficient) when
J-aggregate
Band of absorption in spectroscopy UV-Vis around 400 nm
Soret. The term is commonly used in absorption spectroscopy, corresponding to a wavelength of maximum absorption (electromagnetic radiation) ranging around
Soret_peak
Change in color of a solution with different solvents
between them changes as the solvent changes. This is reflected in the absorption or emission spectrum of the solute as differences in the position, intensity
Solvatochromism
German physicist (1904–1995)
for the discovery of particle spin and for his theory of X-ray absorption spectroscopy. His theories include the Kronig–Penney model, the Coster–Kronig
Ralph_Kronig
readings are taken. The slope spectroscopy technique can be applied using the same methods as in absorption spectroscopy. With the advent of accurate linear
Variable_pathlength_cell
Graphite furnace atomic absorption spectroscopy (GFAAS), also known as electrothermal atomic absorption spectroscopy (ETAAS), is a type of spectrometry
Graphite furnace atomic absorption
Graphite_furnace_atomic_absorption
Form of microscopy using an electron beam
ionization EELS (which provides much the same information as x-ray absorption spectroscopy, but from much smaller volumes of material). The dividing line
Electron energy loss spectroscopy
Electron_energy_loss_spectroscopy
Vernier spectroscopy is a type of cavity enhanced laser absorption spectroscopy that is especially sensitive to trace gases. The method uses a frequency
Vernier_spectroscopy
Series of lines in atomic spectra
In atomic emission spectroscopy, the principal series is a series of spectral lines caused when electrons move between p orbitals of an atom and the lowest
Principal series (spectroscopy)
Principal_series_(spectroscopy)
In physics, an absorption edge (also known as an absorption discontinuity or absorption limit) is a sharp discontinuity in the absorption spectrum of a
Absorption_edge
Optical technique for monitoring brain activity
Functional near-infrared spectroscopy (fNIRS), sometimes referred to as NIRS or Optical Topography (OT), is an optical brain monitoring technique which
Functional near-infrared spectroscopy
Functional_near-infrared_spectroscopy
Frequencies of light emitted by atoms or chemical compounds
quantum mechanical theory. Absorption spectroscopy Absorption spectrum Atomic spectral line Electromagnetic spectroscopy Electromagnetic spectrum Gas-discharge
Emission_spectrum
Study of simultaneous change in atoms' electronic and vibration energy
complicated than absorption spectra. The intensity of allowed vibronic transitions is governed by the Franck–Condon principle. Vibronic spectroscopy may provide
Vibronic_spectroscopy
Gaseous phase of water
(liquid) and a less associated (vapor/gas) state does so through the absorption or release of kinetic energy. The aggregate measurement of this kinetic
Water_vapor
Spectroscopic technique
Raman spectroscopy (/ˈrɑːmən/; named after the physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules
Raman_spectroscopy
Type of mass spectrometry that uses an inductively coupled plasma to ionize the sample
makes it a versatile tool in isotopic labeling. Compared to atomic absorption spectroscopy, ICP-MS has greater speed, precision, and sensitivity. However
Inductively coupled plasma mass spectrometry
Inductively_coupled_plasma_mass_spectrometry
Electric and magnetic fields produced by moving charged objects
it was unable to explain the photoelectric effect and atomic absorption spectroscopy, experiments at the atomic scale. That required the use of quantum
Electromagnetic_field
Quantitative study of the energy spectra of gamma-ray sources
angular correlation Pandemonium effect Total absorption spectroscopy Scintillation counter X-ray spectroscopy Gilmore, Gordon R.; Hemingway, John D. (2008)
Gamma_spectroscopy
Sudden increase in x-ray absorption
In X-ray absorption spectroscopy, the K-edge is a sudden increase in x-ray absorption occurring when the energy of the X-rays is just above the binding
K-edge
Simultaneous absorption of two photons by a molecule
physics, two-photon absorption (TPA or 2PA), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of
Two-photon_absorption
American Physicist
characterization, including machine learning methods for X-ray absorption spectroscopy and multimodal, operando methods for catalytic studies using synchrotron
Anatoly_Frenkel
Emission of secondary X-rays from a material excited by high-energy X-rays
X-ray emission spectroscopy (XES) is a form of X-ray spectroscopy in which a core electron is excited by an incident X-ray photon and then this excited
X-ray_emission_spectroscopy
Rules predicting maximum absorption wavelengths
Louis F. Fieser; Mary Fieser; Srinivasa Rajagopalan (1948). "Absorption Spectroscopy and the Structures of the Diosterols". J. Org. Chem. 13 (6): 800–6
Woodward's_rules
Analytic scientific technique
coupled plasma atomic emission spectroscopy (ICP-AES), also referred to as inductively coupled plasma optical emission spectroscopy (ICP-OES), is an analytical
Inductively coupled plasma atomic emission spectroscopy
Inductively_coupled_plasma_atomic_emission_spectroscopy
Coefficient used in spectrophotometry
LBOZ is a coefficient used in spectrophotometry to estimate selectivity (amount of overlapping of spectra) in a quantitative manner. It is named after
LBOZ
Molecular orbital theory
this oxidation state. Using UV/visible/near IR spectroscopy, Cu K-edge X-ray absorption spectroscopy, and 1s2p resonant inelastic X-ray scattering in
Inverted_ligand_field_theory
Particle accelerator designed to produce intense x-ray beams
change in absorption of a particular element.[citation needed] Other spectroscopy techniques include angle resolved photoemission spectroscopy (ARPES),
Synchrotron_light_source
cavity-enhanced optical-heterodyne molecular spectroscopy (NICE-OHMS) is an ultra-sensitive laser-based absorption technique that utilizes laser light to assess
Noise-immune cavity-enhanced optical heterodyne molecular spectroscopy
Noise-immune_cavity-enhanced_optical_heterodyne_molecular_spectroscopy
Form of phototherapy
is a chemical compound that can be promoted to an excited state upon absorption of light and undergo intersystem crossing (ISC) with oxygen to produce
Photodynamic_therapy
Laboratory technique
Nuclear magnetic resonance spectroscopy, commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique based
Nuclear magnetic resonance spectroscopy
Nuclear_magnetic_resonance_spectroscopy
Chemical compound
been determined by X-ray crystallography, EPR spectroscopy, X-ray absorption spectroscopy, NMR spectroscopy, as well as other methods such as titration
Copper_peptide_GHK-Cu
Type of apparatus that converts liquids into a fine mist
plasma atomic emission spectroscopy (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), and atomic absorption spectroscopy (AAS). Analytical
Analytical_nebulizer
European Union regulation
artificial sweat solution for one week, then measuring nickel by atomic absorption spectroscopy or any other appropriate technique (e.g. ICP-MS). Other, equivalent
Nickel_Directive
Use of spectroscopy to investigate and solve problems
Fourier transform infrared spectroscopy (FTIR), where chemical bonds can be detected through their characteristic infrared absorption frequencies or wavelengths
Applied_spectroscopy
an alternative mechanism to flame spectroscopy. In 1849, J. B. L. Foucault experimentally demonstrated that absorption and emission lines appearing at the
History_of_spectroscopy
French astronomer (1839–1906)
the pair had made with an emission spectrum, rather than using absorption spectroscopy which was more typical for the time. He was awarded the Janssen
Georges_Rayet
Study of analytes using scientific instruments
atomic absorption spectroscopy, atomic emission spectroscopy, ultraviolet-visible spectroscopy, X-ray fluorescence spectroscopy, infrared spectroscopy, Raman
Instrumental_chemistry
Layer of material with nanometer-scale thickness
(TEM), energy dispersive X-ray analysis (EDX), Raman spectroscopy, and UV-Vis absorption spectroscopy. The nanofilm market has gained significant economic
Nanofilm
Process in chemistry to detect certain elements
Chemistry Dictionary. 2019-10-14. Retrieved 2023-11-02. "Atomic Absorption Spectroscopy (AAS)|PerkinElmer". www.perkinelmer.com. Retrieved 2023-11-19.
Flame_test
Method for measuring moisture content
enabling the direct validation against known moisture content. Absorption spectroscopy is a relatively simple method of passing light through a gas sample
Moisture_analysis
Allotropes of carbon with a cylindrical nanostructure
coupled plasma mass spectroscopy, resonant Raman scattering, UV-visible-near infrared fluorescence spectroscopy and absorption spectroscopy, scanning electron
Carbon_nanotube
Surface Sensitive equivalent
Surface-extended X-ray absorption fine structure (SEXAFS) is the surface-sensitive equivalent of the EXAFS technique. This technique involves the illumination
Surface-extended X-ray absorption fine structure
Surface-extended_X-ray_absorption_fine_structure
Mass per unit area
the globe. Columns are also returned by the differential optical absorption spectroscopy (DOAS) method and are a common retrieval product from nadir-looking
Area_density
Spectroscopy technique
MTS is a pump-probe spectroscopy technique similar to saturated absorption spectroscopy; however, the pump beam is modulated (typically by a phase shifter
Modulation transfer spectroscopy
Modulation_transfer_spectroscopy
Study of organic compounds containing metal(s)
using dynamic NMR spectroscopy. Other notable techniques include X-ray absorption spectroscopy, electron paramagnetic resonance spectroscopy, and elemental
Organometallic_chemistry
leading contender as the metric of absorption analogous to the absorbance function in transmission absorption spectroscopy. The form of the K-M solution originally
Representative_layer_theory
Method in analytical chemistry
In atomic absorption spectroscopy, for example, standard additions are often used with solid as the sample. In atomic emission spectroscopy, background
Standard_addition
coupled plasma mass spectrometry (ICP-MS), atomic absorption spectroscopy, and atomic emission spectroscopy (including ICP-AES). To perform the digestion
Microwave_digestion
Graph of the rate of biological effectiveness plotted against wavelength of light
biological effectiveness plotted against wavelength of light. It is related to absorption spectrum in many systems. Mathematically, it describes the inverse quantity
Action_spectrum
direct measurement of the action of ion channels. Flame atomic absorption spectroscopy (AAS) determines the total magnesium content of a biological sample
Magnesium_in_biology
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ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
ABSORPTION SPECTROSCOPY
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