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- {{short description|Atom of helium}} {{About|the physics of atomic helium|other properties of helium|Helium}} ...33 KB (4,846 words) - 12:15, 13 January 2025
- ...ections. A detector aperture collects a small solid angle of the scattered helium which then leads to a detector. An image can then be formed by moving the s [[File:SHeM Schematic.svg|thumb|upright=2.5|A diagram showing how a scanning helium microscope works. A beam is formed by a gas expansion and collimation throu ...37 KB (5,693 words) - 18:04, 4 October 2024
- ...|date=1999-06-18|title=Quantum Computing with Electrons Floating on Liquid Helium|url=https://www.science.org/doi/10.1126/science.284.5422.1967|journal=Scien ...on-helium_qubits.jpg|thumb|400x400px|Schematic illustration of electron-on-helium qubits. The Rydberg (left), spin (centre) and orbital (right) degrees of fr ...21 KB (2,887 words) - 22:16, 21 February 2025
Page text matches
- ...first3=S. D.|last4=Meyer|first4=C. J.|date=Sep 1992|title=Pulsed discharge helium ionization detector|journal=Chromatographia|volume=34|issue=5–8|pages=219–2 ...he flow of helium from the discharge zone, are ionized by photons from the helium discharge. Bias electrode(s) focus the resulting [[electron]]s toward the [ ...3 KB (437 words) - 17:44, 20 February 2019
- {{Short description|Helium-like quantum systems that have a nucleus and two electrons}} In [[atomic physics]], a '''two-electron atom''' or '''helium-like ion''' is a [[quantum mechanical]] system consisting of one [[Atomic n ...4 KB (606 words) - 15:19, 14 April 2022
- ...]], and have since been used to calculate corrections for atoms other than helium (e.g. [[beryllium]]<ref>{{Cite journal|last1=Stanke|first1=Monika|last2=Kom ...3 KB (459 words) - 22:16, 20 March 2024
- ...onditions of temperature and pressure]] include all the [[noble gas]]es ([[helium]], [[neon]], [[argon]], [[krypton]], [[xenon]], and [[radon]]), though all ...tely inert, chemical compounds have been synthesized with all but neon and helium.<ref>{{Cite journal|last=Christe|first=Karl O.|date=2001-04-17|title=A Rena ...4 KB (619 words) - 00:49, 1 March 2025
- ...nsity of [[white dwarfs]] and their [[luminosity function]], and the local helium density, Schmidt suggested a value of <math>n \approx 2</math> (and very li ...3 KB (440 words) - 22:16, 27 March 2024
- ...ries''') consists of three [[spectral line|lines]] of singly [[ionised]] [[helium]] found, usually in absorption, in the spectra of hot stars like [[Wolf–Ray ...f name = Robotti /><ref>{{cite journal|title = The Spectra of Hydrogen and Helium|first = N.|last = Bohr|authorlink = Niels Bohr|journal = [[Nature (journal) ...10 KB (1,402 words) - 16:11, 15 July 2024
- ...xtra term that now represents the new electron-electron interactions since helium has one more electron than hydrogen. In fact, this electron-electron intera ...6 KB (882 words) - 04:47, 28 November 2024
- .... |last12=Dorner |first12=R. |title=Observation of the Efimov state of the helium trimer |journal=Science |date=30 April 2015 |volume=348 |issue=6234 |pages= ...3 KB (499 words) - 02:05, 3 February 2024
- ...wn as [[Boyle's law]]. A gas pycnometer is also sometimes referred to as a helium pycnometer. ...ace roughness]] will depend on the atomic or molecular size of the gas. [[Helium]] therefore is most often prescribed as the measurement gas, not only is it ...9 KB (1,319 words) - 03:58, 4 December 2024
- ...It compares matter and antimatter using [[antihydrogen]] and antiprotonic helium and looks into matter-antimatter collisions.<ref>{{cite web|title=ASACUSA – ...2022-03-16 |website=CERN |language=en}}</ref><ref>{{Cite web |title=Pionic helium |url=https://www.mpq.mpg.de/4937857/pionichelium |access-date=2022-03-16 |w ...13 KB (1,778 words) - 14:59, 16 December 2024
- ...phase diagram.svg|thumb|right|A [[phase diagram]] for two [[isotope]]s of helium, showing at bottom a range of temperatures and ratios at which they will ph A mixture of two [[helium]] isotopes ([[helium-3]] and [[helium-4]]) in a certain range of temperatures and concentrations separates into p ...7 KB (1,087 words) - 05:41, 21 May 2024
- {{short description|Artificial helium-like atom with a harmonic instead of Coulomb potential}} ...also known as '''harmonium''' or '''hookium''', refers to an artificial [[helium]]-like atom where the [[Coulomb's law|Coulombic]] electron-nucleus interact ...11 KB (1,716 words) - 06:47, 29 July 2022
- ...|date=1999-06-18|title=Quantum Computing with Electrons Floating on Liquid Helium|url=https://www.science.org/doi/10.1126/science.284.5422.1967|journal=Scien ...on-helium_qubits.jpg|thumb|400x400px|Schematic illustration of electron-on-helium qubits. The Rydberg (left), spin (centre) and orbital (right) degrees of fr ...21 KB (2,887 words) - 22:16, 21 February 2025
- ...own experimental realization is found in the mixture of [[Helium-3]] and [[Helium-4]]. ...5 KB (810 words) - 21:30, 25 June 2024
- ...lls | first2 = JI | last3 = Day | first3 = RA | title = Refinements in the helium line ratio technique for electron temperature measurement and its applicati ...| last5 = Tritz | first5 = K | title = Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic ...4 KB (580 words) - 14:59, 8 January 2024
- ...determined by the ratio of neutrons to protons at neutrino decoupling, the helium abundance indirectly measures the temperature at which neutrino decoupling ...ckground exists, both from [[Big Bang nucleosynthesis]] predictions of the helium abundance, and from anisotropies in the [[cosmic microwave background]]. On ...11 KB (1,538 words) - 00:57, 28 August 2021
- == Helium atom ground state == The [[helium atom]] consists of two [[electron]]s with mass ''m'' and electric charge&nb ...13 KB (1,988 words) - 16:09, 29 October 2024
- |Helium |Helium, Hydrogen, Ar ...8 KB (1,166 words) - 12:12, 20 June 2024
- ...hown by [[Robert Griffiths (physicist)|Robert B. Griffiths]] in a helium-3 helium-4 mixture.<ref>Griffiths, R. B. (1970). Thermodynamics near the two-fluid c ...5 KB (713 words) - 18:53, 18 November 2024
- ...neutrons]] (UCN), which works by scattering cold neutrons in [[superfluid helium]]. ...cold neutrons is downscattered inside superfluid helium; the use of liquid helium instead of vacuum will allow the applied electric field to be increased; im ...8 KB (1,118 words) - 01:07, 15 June 2023