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Helium dimer, the Glossary

The helium dimer is a van der Waals molecule with formula He2 consisting of two helium atoms.^[1]

49 relations: Activation energy, Alfred Fowler, Argon, Atmospheric pressure, Atom, Band head, Binding energy, Bound state, C70 fullerene, Caesium, Carbon dioxide, Chemical bond, Covalent bond, Cryogenics, Diatomic molecule, Diffuse series, Dimerization (chemistry), Double ionization, Efimov state, Electron, Excimer, Excited state, Fullerene, Ground state, Helium, Helium trimer, Helium-3 nuclear magnetic resonance, Ion, Ionization, Linus Pauling, Liquid helium, Lithium helide, Mass spectrometry, Molecular orbital theory, Nitrogen, Oxygen, Partial charge, Photon, Picometre, Principal series (spectroscopy), Rydberg molecule, Rydberg state, Spectral band, Spectrum, Ultraviolet, Van der Waals force, Van der Waals molecule, Vibronic coupling, Xenon.
Allotropes
Dimers (chemistry)
Helium compounds
Homonuclear diatomic molecules
Van der Waals molecules

Activation energy

In the Arrhenius model of reaction rates, activation energy is the minimum amount of energy that must be available to reactants for a chemical reaction to occur.

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Alfred Fowler

Alfred Fowler, CBE FRS (22 March 1868, in Yorkshire – 24 June 1940) was an English astronomer and spectroscopist.

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Argon

Argon is a chemical element; it has symbol Ar and atomic number 18.

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Atmospheric pressure

Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.

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Atom

Atoms are the basic particles of the chemical elements.

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Band head

In spectroscopy a band head is the abrupt edge of a spectroscopic band.

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Binding energy

In physics and chemistry, binding energy is the smallest amount of energy required to remove a particle from a system of particles or to disassemble a system of particles into individual parts.

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Bound state

A bound state is a composite of two or more fundamental building blocks, such as particles, atoms, or bodies, that behaves as a single object and in which energy is required to split them.

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C70 fullerene

C70 fullerene is the fullerene molecule consisting of 70 carbon atoms.

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Caesium

Caesium (IUPAC spelling; cesium in American English) is a chemical element; it has symbol Cs and atomic number 55.

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Carbon dioxide

Carbon dioxide is a chemical compound with the chemical formula.

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Chemical bond

A chemical bond is the association of atoms or ions to form molecules, crystals, and other structures.

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Covalent bond

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

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Cryogenics

In physics, cryogenics is the production and behaviour of materials at very low temperatures.

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Diatomic molecule

Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements.

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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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Dimerization (chemistry)

In chemistry, dimerization is the process of joining two identical or similar molecular entities by bonds. Helium dimer and dimerization (chemistry) are dimers (chemistry).

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Double ionization

Double ionization is a process of formation of doubly charged ions when laser radiation is exerted on neutral atoms or molecules.

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Efimov state

The Efimov effect is an effect in the quantum mechanics of few-body systems predicted by the Russian theoretical physicist V. N. Efimov in 1970.

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Electron

The electron (or in nuclear reactions) is a subatomic particle with a negative one elementary electric charge.

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Excimer

An excimer (originally short for excited dimer) is a short-lived polyatomic molecule formed from two species that do not form a stable molecule in the ground state.

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In quantum mechanics, an excited state of a system (such as an atom, molecule or nucleus) is any quantum state of the system that has a higher energy than the ground state (that is, more energy than the absolute minimum).

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Fullerene

A fullerene is an allotrope of carbon whose molecules consist of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms.

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Ground state

The ground state of a quantum-mechanical system is its stationary state of lowest energy; the energy of the ground state is known as the zero-point energy of the system.

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Helium

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

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Helium trimer

The helium trimer (or trihelium) is a weakly bound molecule consisting of three helium atoms. Helium dimer and helium trimer are allotropes, helium compounds and van der Waals molecules.

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Helium-3 nuclear magnetic resonance

Helium-3 nuclear magnetic resonance (3He-NMR) is an analytical technique used to identify helium-containing compounds.

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Ion

An ion is an atom or molecule with a net electrical charge.

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Ionization

Ionization (or ionisation specifically in Britain, Ireland, Australia and New Zealand) is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons, often in conjunction with other chemical changes.

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Linus Pauling

Linus Carl Pauling (February 28, 1901August 19, 1994) was an American chemist, biochemist, chemical engineer, peace activist, author, and educator.

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Liquid helium

Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.

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Lithium helide

Lithium helide is a compound of helium and lithium with the formula LiHe. Helium dimer and lithium helide are helium compounds and van der Waals molecules.

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Mass spectrometry

Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions.

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Molecular orbital theory

In chemistry, molecular orbital theory (MO theory or MOT) is a method for describing the electronic structure of molecules using quantum mechanics.

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Nitrogen

Nitrogen is a chemical element; it has symbol N and atomic number 7.

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Oxygen

Oxygen is a chemical element; it has symbol O and atomic number 8.

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Partial charge

In atomic physics, a partial charge (or net atomic charge) is a non-integer charge value when measured in elementary charge units.

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Photon

A photon is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

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Picometre

The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to, or one trillionth of a metre, which is the SI base unit of length.

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References

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

Also known as Dihelium, Dihelium anion, Dihelium cation, Dihelium-4, He2.

Helium dimer, the Glossary

Table of Contents

See also

Allotropes

Dimers (chemistry)

Helium compounds

Homonuclear diatomic molecules

Van der Waals molecules

References