63 relations: Absorption spectroscopy, Academic Press, Atom, Atomic nucleus, Auger effect, Balmer series, Bohr model, Calcium, Cauchy distribution, Cerium, Chemical element, Chemical species, Compact fluorescent lamp, Continuous spectrum, Density, Dicke effect, Diffuse series, Doppler effect, Electromagnetic spectrum, Electron, Electron configuration, Emission spectrum, Fraunhofer lines, Gamma ray, Gas, Gaussian function, Helium, Homogeneous broadening, Hydrogen, Hydrogen line, Hydrogen spectral series, Ion, Iron, Lévy distribution, Lennard-Jones potential, Lyman series, Molecule, Motional narrowing, Multiplet, Photon, Plasma (physics), Quantum mechanics, Radio wave, Roman numerals, Rydberg–Ritz combination principle, Sharp series, Spectral bands, Spectral line ratios, Spectroscopy, Splatalogue, ..., Spontaneous emission, Stable distribution, Star, Stark effect, Temperature, Thallium, Thermodynamic equilibrium, Uncertainty principle, Van der Waals force, Visible spectrum, Voigt profile, Wavelength, Z-pinch. Expand index (13 more) »

## Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of radiation, as a function of frequency or wavelength, due to its interaction with a sample.

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## Academic Press

Academic Press is an academic book publisher.

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## Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

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## Atomic nucleus

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.

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## Auger effect

The Auger effect is a physical phenomenon in which the filling of an inner-shell vacancy of an atom is accompanied by the emission of an electron from the same atom.

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## Balmer series

The Balmer series or Balmer lines in atomic physics, is the designation of one of a set of six named series describing the spectral line emissions of the hydrogen atom.

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## Bohr model

In atomic physics, the Rutherford–Bohr model or Bohr model or Bohr diagram, introduced by Niels Bohr and Ernest Rutherford in 1913, depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus—similar to the structure of the Solar System, but with attraction provided by electrostatic forces rather than gravity.

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## Calcium

Calcium is a chemical element with symbol Ca and atomic number 20.

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## Cauchy distribution

The Cauchy distribution, named after Augustin Cauchy, is a continuous probability distribution.

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## Cerium

Cerium is a chemical element with symbol Ce and atomic number 58.

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## Chemical element

A chemical element is a species of atoms having the same number of protons in their atomic nuclei (that is, the same atomic number, or Z).

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## Chemical species

A chemical species is a chemical substance or ensemble composed of chemically identical molecular entities that can explore the same set of molecular energy levels on a characteristic or delineated time scale.

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## Compact fluorescent lamp

A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.

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## Continuous spectrum

In physics, a continuous spectrum usually means a set of attainable values for some physical quantity (such as energy or wavelength) that is best described as an interval of real numbers, as opposed to a discrete spectrum, a set of attainable values that is discrete in the mathematical sense, where there is a positive gap between each value and the next one.

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## Density

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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## Dicke effect

Dicke effect, also known as Dicke narrowing (or sometimes collisional narrowing) in spectroscopy, named after Robert H. Dicke, refers to narrowing of the Doppler broadening of a spectral line due to collisions the emitting species (usually an atom or a molecule) experiences with other particles.

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## Diffuse series

The diffuse series is a series of spectral lines in the atomic emission spectrum caused when electrons jump between the lowest p orbital and d orbitals of an atom.

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## Doppler effect

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.

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## Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

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## Electron

The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.

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## Electron configuration

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.

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## Emission spectrum

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

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## Fraunhofer lines

In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826).

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## Gamma ray

A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.

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## Gas

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).

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## Gaussian function

In mathematics, a Gaussian function, often simply referred to as a Gaussian, is a function of the form: for arbitrary real constants, and.

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## Helium

Helium (from lit) is a chemical element with symbol He and atomic number 2.

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## Homogeneous broadening

Homogeneous broadening is a type of emission spectrum broadening in which all atoms radiating from a specific level under consideration radiate with equal opportunity.

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## Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1.

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## Hydrogen line

The hydrogen line, 21-centimeter line or H I line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms.

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## Hydrogen spectral series

The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula.

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## Ion

An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

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## Iron

Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.

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## Lévy distribution

No description.

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## Lennard-Jones potential

The Lennard-Jones potential (also termed the L-J potential, 6-12 potential, or 12-6 potential) is a mathematically simple model that approximates the interaction between a pair of neutral atoms or molecules.

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## Lyman series

In physics and chemistry, the Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n.

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## Molecule

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

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## Motional narrowing

In physics and chemistry, motional narrowing is a phenomenon where a certain resonant frequency has a smaller linewidth than might be expected, due to motion in an inhomogeneous system.

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## Multiplet

In representation theory, a multiplet refers to a representation of a mathematical structure.

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## Photon

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).

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## Plasma (physics)

Plasma (Henry George Liddell, Robert Scott, A Greek English Lexicon, on Perseus) is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s.

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## Quantum mechanics

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.

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## Radio wave

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.

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## Roman numerals

The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.

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## Rydberg–Ritz combination principle

The Rydberg–Ritz combination principle is an empirical generalization proposed by Walther Ritz in 1908 to describe the relationship of the spectral lines for all atoms.

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## Sharp series

The sharp series is a series of spectral lines in the atomic emission spectrum caused when electrons jump between the lowest p orbital and s orbitals of an atom.

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## Spectral bands

Spectral bands are part of optical spectra of polyatomic systems, including condensed materials, large molecules, etc.

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## Spectral line ratios

The analysis of line intensity ratios is an important tool to obtain information about laboratory and space plasmas.

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## Spectroscopy

Spectroscopy is the study of the interaction between matter and electromagnetic radiation.

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## Splatalogue

Splatalogue is a database for astronomical spectroscopy which contains information on nearly six million spectral lines and is maintained by the National Radio Astronomy Observatory (NRAO).

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## Spontaneous emission

Spontaneous emission is the process in which a quantum mechanical system (such as an atom, molecule or subatomic particle) transitions from an excited energy state to a lower energy state (e.g., its ground state) and emits a quantum in the form of a photon.

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## Stable distribution

No description.

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## Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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## Stark effect

The Stark effect is the shifting and splitting of spectral lines of atoms and molecules due to presence of an external electric field.

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## Temperature

Temperature is a physical quantity expressing hot and cold.

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## Thallium

Thallium is a chemical element with symbol Tl and atomic number 81.

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## Thermodynamic equilibrium

Thermodynamic equilibrium is an axiomatic concept of thermodynamics.

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## Uncertainty principle

In quantum mechanics, the uncertainty principle (also known as Heisenberg's uncertainty principle) is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position x and momentum p, can be known.

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## Van der Waals force

In molecular physics, the van der Waals forces, named after Dutch scientist Johannes Diderik van der Waals, are distance-dependent interactions between atoms or molecules.

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## Visible spectrum

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.

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## Voigt profile

In spectroscopy, the Voigt profile (named after Woldemar Voigt) is a line profile resulting from the convolution of two broadening mechanisms, one of which alone would produce a Gaussian profile (usually, as a result of the Doppler broadening), and the other would produce a Lorentzian profile.

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## Wavelength

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

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## Z-pinch

In fusion power research, the Z-pinch, also known as zeta pinch, is a type of plasma confinement system that uses an electrical current in the plasma to generate a magnetic field that compresses it (see pinch).

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## Redirects here:

Absorption bands, Absorption line, Absorption lines, Bright-line, Broadening, Broadening (spectral line), Collisional broadening, Emission line, Emission lines, Emission-line, Line broadening, Line width, Linewidth, Natural broadening, Natural linewidth, Pressure broadening, Resonance broadening, Self-reversal, Self-reversal (spectroscopy), Spectral Line Broadening, Spectral line broadening, Spectral line width, Spectral lines, Spectral linewidth, Spectroscopic lines, Spectrum line, Van der Waals broadening.

## References

[1] https://en.wikipedia.org/wiki/Spectral_line