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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Spectroscopy | 4/5 | https://en.wikipedia.org/wiki/Spectroscopy | reference | science, encyclopedia | 2026-05-05T13:33:39.825730+00:00 | kb-cron |
Acoustic resonance spectroscopy is based on sound waves primarily in the audible and ultrasonic regions. Auger electron spectroscopy is a method used to study surfaces of materials on a micro-scale. It is often used in connection with electron microscopy. Cavity ring-down spectroscopy enables measurement of absolute optical extinction by samples that scatter and absorb light. Circular dichroism spectroscopy measures the differential absorption of left- and right-handed circularly polarized light. Coherent anti-Stokes Raman spectroscopy is a recent technique that has high sensitivity and powerful applications for in vivo spectroscopy and imaging. Cold vapour atomic fluorescence spectroscopy is a subclass of the atomic emission spectroscopy technique that measures trace amounts of volatile heavy metals in the air, such as mercury. Correlation spectroscopy encompasses several types of two-dimensional NMR spectroscopy. Deep-level transient spectroscopy measures concentration and analyzes parameters of electrically active defects in semiconducting materials. Dielectric spectroscopy measures the dielectric properties of a medium as a function of frequency. Dual-polarization interferometry measures the real and imaginary components of the complex refractive index. Electron energy loss spectroscopy in transmission electron microscopy. Electron phenomenological spectroscopy measures the physicochemical properties and characteristics of the electronic structure of multicomponent and complex molecular systems. Electron paramagnetic resonance spectroscopy is similar to nuclear magnetic resonance (NMR), except it measures the spin excitement of unpaired electrons. Force spectroscopy is a set of techniques for the study of the interactions and the binding forces between individual molecules, although the name is somewhat misleading because there is no true matter-radiation interaction. Fourier-transform spectroscopy is an efficient method for processing spectra data obtained using interferometers. Fourier-transform infrared spectroscopy is an implementation of infrared spectroscopy. NMR also employs Fourier transforms. Gamma spectroscopy measures the gamma ray emissions from high energy processes including radioactive and astrophysical sources. Hadron spectroscopy studies the energy/mass spectrum of hadrons according to spin, parity, and other particle properties. Baryon spectroscopy and meson spectroscopy are types of hadron spectroscopy. Multispectral imaging and hyperspectral imaging is a method to create a complete picture of the environment or various objects, each pixel containing a full visible, visible near infrared, near infrared, or infrared spectrum. Inelastic electron tunneling spectroscopy uses the changes in current due to inelastic electron-vibration interaction at specific energies that can also measure optically forbidden transitions. Inelastic neutron scattering is similar to Raman spectroscopy, but uses neutrons instead of photons. Laser-induced breakdown spectroscopy, also called laser-induced plasma spectrometry, is a type of atomic emission spectroscopy which uses a highly energetic laser pulse as the excitation source Laser spectroscopy uses tunable lasers and other types of coherent emission sources, such as optical parametric oscillators, for selective excitation of atomic or molecular species. Light scattering spectroscopy (LSS) is a spectroscopic technique typically used to evaluate morphological changes in epithelial cells in order to study mucosal tissue and detect early cancer and precancer. Mass spectroscopy is a historical term used to refer to mass spectrometry. The current recommendation is to use the latter term. The term "mass spectroscopy" originated in the use of phosphor screens to detect ions. Mössbauer spectroscopy probes the properties of specific isotopic nuclei in different atomic environments by analyzing the resonant absorption of gamma rays. See Mössbauer effect. Neutron spin echo spectroscopy measures internal dynamics in proteins and other soft matter systems. Nuclear quadrupole resonance is a chemical spectroscopy method mediated by NMR of the electric field gradient (EFG) in the absence of magnetic field Perturbed angular correlation (PAC) uses radioactive nuclei as probe to study electric and magnetic fields (hyperfine interactions) in crystals (condensed matter) and bio-molecules. Photoacoustic spectroscopy is the measurement of the effect of absorbed electromagnetic energy on matter by means of acoustic detection. Acoustic emission spectroscopy is the measurement of acoustic waves as a material is deformed. Photoemission spectroscopy measures the energy or spin of electrons emitted from materials by the photoelectric effect. X-ray photoelectron spectroscopy is a surface analysis technique that uses a beam of X-rays to perform photoemission spectroscopy Photothermal spectroscopy measures heat evolved upon absorption of radiation. Pump-probe spectroscopy can use ultrafast laser pulses to measure reaction intermediates in the femtosecond timescale. Raman optical activity spectroscopy exploits Raman scattering and optical activity effects to reveal detailed information on chiral centers in molecules. Raman spectroscopy is used to determine vibrational modes of molecules, providing a structural fingerprint by which molecules can be identified. Saturated spectroscopy uses a dual laser technique to remove the Doppler profiles from spectroscopic signals of hot atoms. It does so by measuring the spectral signal of atoms moving perpendicular to the laser. Scanning tunneling spectroscopy uses a scanning tunneling microscope to measure the current–voltage characteristics of a surface and build a map of the electronic structure. Spectrophotometry combines a spectrometer with a photometer to measure the energy intensity at different wavelengths. This can be used to determine the reflection or transmission properties of a substance. Spin noise spectroscopy traces spontaneous fluctuations of electronic and nuclear spins. Time-resolved spectroscopy measures the decay rates of excited states using various spectroscopic methods. Time-stretch spectroscopy Thermal infrared spectroscopy measures thermal radiation emitted from materials and surfaces and is used to determine the type of bonds present in a sample as well as their lattice environment. The techniques are widely used by organic chemists, mineralogists, and planetary scientists. Transient grating spectroscopy measures quasiparticle propagation. It can track changes in metallic materials as they are irradiated. Ultraviolet photoelectron spectroscopy Ultraviolet–visible spectroscopy Vibrational circular dichroism spectroscopy Video spectroscopy
== Applications ==
There are several applications of spectroscopy in the fields of medicine, physics, chemistry, and astronomy. Taking advantage of the properties of absorbance and, with astronomy, emission, spectroscopy can be used to identify certain states of nature. The uses of spectroscopy in so many different scientific fields and for so many different applications has led to the creation of specialized subfields. Such examples include: