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Longer titles found: Helium atom scattering (view)

searching for Helium atom 81 found (119 total)

Antiprotonic helium (1,196 words) [view diff] exact match in snippet view article find links to article

spontaneously displaces one of the two electrons contained in a normal helium atom in a chemical reaction, and then begins to orbit the helium nucleus in

Lithium helide (498 words) [view diff] exact match in snippet view article find links to article

low-density gas made of Van der Waals molecules, each composed of a helium atom and lithium atom bound by van der Waals force. The preparation of LiHe

Alpha particle (4,206 words) [view diff] exact match in snippet view article find links to article

environment, the alpha particle becomes a normal (electrically neutral) helium atom 4 2He. Alpha particles have a net spin of zero. When produced in standard

Helium compounds (11,142 words) [view diff] exact match in snippet view article find links to article

The electron affinity is 0.080 eV, which is very close to zero. The helium atom is small with the radius of the outer electron shell at 0.29 Å. Helium

Helium-3 nuclear magnetic resonance (174 words) [view diff] exact match in snippet view article find links to article

analytical technique used to identify helium-containing compounds. Because a helium atom, or even two helium atoms, can be encased in fullerene-like cages, the

Helion (chemistry) (190 words) [view diff] exact match in snippet view article

A helion (symbol h) is the nucleus of a helium atom, a doubly positively charged cation. The term helion is a portmanteau of helium and ion, and in practice

Helium dimer (4,056 words) [view diff] exact match in snippet view article find links to article

takes 19.8 eV. The electron can then combine with another helium atom and the excited helium atom to form He2−. He2− repels helium atoms, and so has a void

Helium trimer (533 words) [view diff] exact match in snippet view article find links to article

vacuum chamber. Such a set up also produces the helium dimer and other helium atom clusters. The existence of the molecule was proven by matter wave diffraction

Aviation electronics technician (United States Navy) (993 words) [view diff] exact match in snippet view article

Aviation electronics technicians wear the specialty mark of a winged helium atom. Aviation electronics technicians (intermediate) perform intermediate

Picometre (284 words) [view diff] exact match in snippet view article find links to article

Picometre A simplified representation of a helium atom, having an estimated (calculated) diameter of 62 picometres General information Unit system SI

Decay technique (2,072 words) [view diff] exact match in snippet view article find links to article

For example, decay of a tritium-labeled molecule yields an ionized helium atom, which might then break off to leave a cationic molecular fragment. The

Nanometre (437 words) [view diff] exact match in snippet view article find links to article

often used to express dimensions on an atomic scale: the diameter of a helium atom, for example, is about 0.06 nm, and that of a ribosome is about 20 nm

South Hamgyong Sci-Tech Library (181 words) [view diff] exact match in snippet view article find links to article

atoms, or planets with rings, on the roof, there is also a statue of a helium atom in front of the building. Zwirko, Colin (31 December 2018). "New North

Helium hydride ion (2,993 words) [view diff] exact match in snippet view article find links to article

(positively charged ion) with chemical formula HeH+. It consists of a helium atom bonded to a hydrogen atom, with one electron removed. It can also be

Atomic nucleus (3,945 words) [view diff] exact match in snippet view article find links to article

1s orbitals analogous to the 1s orbital for the two electrons in the helium atom, and achieve unusual stability for the same reason. Nuclei with 5 nucleons

Møller scattering (3,104 words) [view diff] exact match in snippet view article find links to article

of many familiar phenomena such as the repulsion of electrons in the helium atom. While formerly many particle colliders were designed specifically for

Electron hole (1,956 words) [view diff] exact match in snippet view article find links to article

When an electron leaves a helium atom, it leaves an electron hole in its place. This causes the helium atom to become positively charged.

Nuclear reaction (2,406 words) [view diff] exact match in snippet view article find links to article

nucleus is unusually stable and tightly bound for the same reason that the helium atom is inert: each pair of protons and neutrons in He-4 occupies a filled

Endohedral fullerene (2,304 words) [view diff] exact match in snippet view article find links to article

conditions about one out of every 650,000 C60 cages was doped with a helium atom. The formation of endohedral complexes with helium, neon, argon, krypton

Langmuir states (136 words) [view diff] case mismatch in snippet view article find links to article

motion is equilateral. Langmuir, Irving (1921). "The Structure of the Helium Atom". Physical Review. 17 (3): 339. Bibcode:1921PhRv...17..339L. doi:10.1103/PhysRev

Giorgio Benedek (1,208 words) [view diff] exact match in snippet view article find links to article

predicted the feasibility of surface-phonon spectroscopy with inelastic Helium atom scattering (HAS). The collaboration of Benedek with Jan Peter Toennies

Atom optics (852 words) [view diff] case mismatch in snippet view article find links to article

Wöll (1999). "Towards Realization of an Atomic de Broglie Microscope: Helium Atom Focusing Using Fresnel Zone Plates" (PDF). Physical Review Letters. 83

Hooke's atom (2,249 words) [view diff] exact match in snippet view article find links to article

electron-electron interaction potential. The non-relativistic Hamiltonian of the helium atom differs only in the replacement: − 2 r → 1 2 k r 2 . {\displaystyle -{\frac

Surface (1,651 words) [view diff] exact match in snippet view article find links to article

density functional theory, and build on our complementary work applying helium atom scattering and scanning tunnelling microscopy to small molecules with

Selective adsorption (258 words) [view diff] case mismatch in snippet view article find links to article

MIT Press. ISBN 0-585-35966-0. OCLC 1289746352. Hulpke, E. (1992). Helium Atom Scattering from Surfaces. Springer. p. 168. ISBN 9783662027745. Torres

Stellar core (1,839 words) [view diff] exact match in snippet view article find links to article

their central region, which joins four hydrogen nuclei to form a single helium atom through thermonuclear fusion. The Sun is an example of this class of

Data systems technician (215 words) [view diff] exact match in snippet view article find links to article

The rating badge for data systems technician, a helium atom with input/output arrows.

Jan Peter Toennies (305 words) [view diff] case mismatch in snippet view article find links to article

Atomic Scale Dynamics at Surfaces: Theory and Experimental Studies with Helium Atom Scattering, Springer, Heidelberg, 2018 "Short Curriculum Vitae of J.

Resonance (chemistry) (5,094 words) [view diff] exact match in snippet view article

in a discussion of the quantum states of the helium atom. He compared the structure of the helium atom with the classical system of resonating coupled

Exotic atom (1,572 words) [view diff] exact match in snippet view article find links to article

Its chemical behavior behaves more like a hydrogen atom than an inert helium atom. A hadronic atom is an atom in which one or more of the orbital electrons

SEAC (computer) (1,138 words) [view diff] exact match in snippet view article

for LORAN navigation statistical sampling plans wave function of the helium atom designing a proton synchrotron SEAC block diagram SEAC input/output diagram

Nuclear fusion (12,000 words) [view diff] exact match in snippet view article find links to article

allowed the discovery that four hydrogen atoms are heavier than one helium atom. Thus in 1920, Arthur Eddington correctly predicted fusion of hydrogen

Astrophysics (3,285 words) [view diff] exact match in snippet view article find links to article

would be a mass loss if four hydrogen atoms combined to form a single helium atom. Einstein's equivalence of mass and energy led directly to the suggestion

Jean Baptiste Perrin (1,585 words) [view diff] exact match in snippet view article find links to article

provide the source of energy in stars. He realized that the mass of a helium atom is less than that of four atoms of hydrogen, and that the mass-energy

Proton affinity (1,028 words) [view diff] exact match in snippet view article find links to article

the gas phase, followed by dihydrogen. The weakest known base is the helium atom (Epa = 177.8 kJ/mol), making the hydrohelium(1+) ion the strongest known

Buffer gas (866 words) [view diff] exact match in snippet view article find links to article

of particles we want to cool down is caught in a trap that lets the helium atom pass through. If the particles are electrically charged, then the trap

List of particles (2,542 words) [view diff] exact match in snippet view article find links to article

A semi-accurate depiction of the helium atom. In the nucleus, the protons are in red and neutrons are in purple. In reality, the nucleus is also spherically

Arthur Eddington (6,598 words) [view diff] exact match in snippet view article find links to article

that the mass of a helium atom was about 0.8% less than the mass of the four hydrogen atoms which would, combined, form a helium atom, suggesting that if

Solar core (1,893 words) [view diff] exact match in snippet view article find links to article

energy released by these reactions in turning 4 hydrogen atoms into 1 helium atom is 26.7 MeV. The second reaction sequence, in which 4 H nuclei may eventually

Atomic units (2,364 words) [view diff] exact match in snippet view article find links to article

example, the Hamiltonian operator in the Schrödinger equation for the helium atom with standard quantities, such as when using SI units, is H ^ = − ℏ 2

A. David Buckingham (1,189 words) [view diff] case mismatch in snippet view article find links to article

Buckingham A.D. and Hibbard P., Polarizability and Hyperpolarizability of the Helium Atom, Symp. Faraday Society, 2, 1968, 41-47, https://doi.org/10.1039/SF9680200041

Atomic radius (2,405 words) [view diff] exact match in snippet view article find links to article

Diagram of a helium atom, showing the electron probability density as shades of gray.

Quantum mechanics (12,086 words) [view diff] exact match in snippet view article find links to article

particle in a box, the dihydrogen cation, and the hydrogen atom. Even the helium atom – which contains just two electrons – has defied all attempts at a fully

MADNESS (1,652 words) [view diff] exact match in snippet view article find links to article

The first-order Moller-Plesset wave function for the ground state of helium atom". The Journal of Chemical Physics. 137 (10): 104103–104112. Bibcode:2012JChPh

Angular momentum coupling (2,228 words) [view diff] exact match in snippet view article find links to article

equation. As an example we consider two electrons, in an atom (say the helium atom) labeled with i = 1 and 2. If there is no electron–electron interaction

Theodore Maiman (2,950 words) [view diff] case mismatch in snippet view article find links to article

"Measurement of the Fine Structure Separation 333P1 – 33P2 for the Helium Atom". Physical Review. 105 (2): 573–79. Bibcode:1957PhRv..105..573L. doi:10

Helium release valve (1,291 words) [view diff] exact match in snippet view article find links to article

atoms are the smallest natural gas particles—the atomic radius of a helium atom is 0.49 angstrom and that of a water molecule is about 2.75 angstrom—

Orders of magnitude (volume) (652 words) [view diff] exact match in snippet view article

Waals radius of a hydrogen atom 3.936×10−29 van der Waals volume of a helium atom 1.91×10−29 volume enclosed by the van der Waals radius of a gold atom

Our Mr. Sun (2,645 words) [view diff] exact match in snippet view article find links to article

Research then mentions combining two hydrogen atoms directly into a helium atom in the proton-proton process. Dr. Research continues, telling how science

Bohr model of the chemical bond (444 words) [view diff] case mismatch in snippet view article find links to article

ISBN 9780199654987. Mehra, Jagdish; Rechenberg, Helmut (2001). "IV.2. The Helium Atom and Other Few-Body Problems". The Historical Development of Quantum Theory

Coherent control (2,913 words) [view diff] exact match in snippet view article find links to article

S2CID 41953962. Barna, Imre Ferenc (2005). "Coherent control calculations for helium atom in short and intensive XUV laser pulses". The European Physical Journal

Bianconi–Barabási model (3,121 words) [view diff] exact match in snippet view article find links to article

fermion. For example, an electron is a fermion, while a photon or a helium atom is a boson. In quantum mechanics, the energy of a (bound) particle is

Paradigm shift (3,823 words) [view diff] exact match in snippet view article find links to article

chemist and a physicist might operate with different paradigms of what a helium atom is. Under normal science, scientists encounter anomalies that cannot

Macroscopic quantum phenomena (3,324 words) [view diff] exact match in snippet view article find links to article

that forms the superfluid component is a macroscopic quantum fluid. The helium atom is a neutral particle, so q = 0. Furthermore, when considering helium-4

Ionizing radiation (6,496 words) [view diff] exact match in snippet view article find links to article

environment, the α particle can be written as a normal (electrically neutral) helium atom 4 2He. Beta (β) particles are high-energy, high-speed electrons or positrons

Bidyendu Mohan Deb (3,174 words) [view diff] exact match in snippet view article find links to article

"Density Functional calculation for doubly excited auto-ionizing states of helium atom". J. Chem. Phys. 104 (15): 5892–5897. Bibcode:1996JChPh.104.5892S. doi:10

Timeline of microscope technology (1,176 words) [view diff] exact match in snippet view article find links to article

Sabrina Daniela; Bracco, Gianangelo; Holst, Bodil (2023). "Neutral helium atom microscopy". Ultramicroscopy. 251. doi:10.1016/j.ultramic.2023.113753

History of subatomic physics (4,053 words) [view diff] exact match in snippet view article find links to article

demonstrated that an alpha particle combines with two electrons and forms a helium atom. In modern terms, alpha particles are doubly ionized helium (more precisely

Muon (5,527 words) [view diff] exact match in snippet view article find links to article

with other atoms, and behaves more like a hydrogen atom than an inert helium atom. Muonic heavy hydrogen atoms with a negative muon may undergo nuclear

Geochemistry (7,049 words) [view diff] exact match in snippet view article find links to article

in the gas phosphine (PH3) and germanium in germane (GeH4).: 131 The helium atom has vibrations in the ultraviolet range, which is strongly absorbed by

Hughes Medal (2,600 words) [view diff] exact match in snippet view article find links to article

forces, non-linear optics, problems related to the polarizability of the helium atom, the interpretation of NMR spectra, and the applications of ab initio

Quantum chemistry composite methods (3,473 words) [view diff] case mismatch in snippet view article find links to article

(2002). "Complete Basis Set Models for Chemical Reactivity: from the Helium Atom to Enzyme Kinetics". In Cioslowski, J. (ed.). Quantum-Mechanical Prediction

Noble gas compound (3,550 words) [view diff] exact match in snippet view article find links to article

conditions, only about one out of every 650,000 C60 cages was doped with a helium atom; with higher pressures (3000 bar), it is possible to achieve a yield

Quantum harmonic oscillator (6,961 words) [view diff] exact match in snippet view article find links to article

the masses of the two atoms. The Hooke's atom is a simple model of the helium atom using the quantum harmonic oscillator. Modelling phonons, as discussed

Giacinto Scoles (2,731 words) [view diff] exact match in snippet view article find links to article

molecule-molecule interactions, using his bolometer detector. He also began using helium atom diffraction to study the structure of surfaces, both of pure crystals

Rutherford scattering experiments (13,581 words) [view diff] exact match in snippet view article find links to article

know exactly how many electrons a helium atom had (nor atoms of other elements for that matter), so a helium atom stripped of two electrons might still

Super-Kamiokande (6,587 words) [view diff] exact match in snippet view article find links to article

energy of the Sun comes from the nuclear fusion in its core where a helium atom and two electron neutrinos are generated by 4 protons. These neutrinos

Laser Interferometer Space Antenna (5,410 words) [view diff] exact match in snippet view article find links to article

displacements with a resolution of 20 picometres—less than the diameter of a helium atom—over a distance of a million kilometres, yielding a strain sensitivity

Laser Interferometer Space Antenna (5,410 words) [view diff] exact match in snippet view article find links to article

displacements with a resolution of 20 picometres—less than the diameter of a helium atom—over a distance of a million kilometres, yielding a strain sensitivity

Outer space (14,510 words) [view diff] exact match in snippet view article find links to article

helium, resulting, for example, in the trihydrogen cation. An ionized helium atom can then split relatively abundant carbon monoxide to produce ionized

Pit (nuclear weapon) (6,264 words) [view diff] exact match in snippet view article

then it stops, acquires two electrons from nearby atoms, and becomes a helium atom. The contaminant plutonium-241 beta-decays to americium-241, which then

Nuclear binding energy (7,077 words) [view diff] exact match in snippet view article find links to article

and inertia), whereas removing energy decreases mass. For example, a helium atom containing four nucleons has a mass about 0.8% less than the total mass

History of atomic theory (10,096 words) [view diff] exact match in snippet view article find links to article

the hydrogen atom and the hydrogen molecular ion. Beginning with the helium atom—which contains just two electrons—numerical methods are used to solve

History of quantum mechanics (9,382 words) [view diff] exact match in snippet view article find links to article

The chemist Linus Pauling wrote, by way of example: In the case of a helium atom with two electrons in the 1s orbital, the Pauli Exclusion Principle requires

Superfluid helium-4 (5,002 words) [view diff] exact match in snippet view article find links to article

less than 0.7 nm (i.e. roughly three times the classical diameter of helium atom), suggesting the unusual hydrodynamic properties of He arise at larger

Orders of magnitude (length) (17,809 words) [view diff] exact match in snippet view article

10−11 and 10−10 m (10 pm and 100 pm). 25 pm – approximate radius of a helium atom, the smallest neutral atom 30.8568 pm – 1 rontoparsec 50 pm – radius

Thermodynamic temperature (13,823 words) [view diff] exact match in snippet view article find links to article

here two trillion-fold). At any given instant however, a particular helium atom may be moving much faster than average while another may be nearly motionless

William Halperin (2,018 words) [view diff] exact match in snippet view article find links to article

superfluid phases of 3He, an unconventional, topological superfluid of helium atom pairs at low temperatures below 0.0025 K, discovered by Osheroff, Richardson

Lambert W function (12,429 words) [view diff] case mismatch in snippet view article find links to article

A.; Bressanini, D.; Morgan, J. D. III (2007). "The Nodal Surfaces of Helium Atom Eigenfunctions" (PDF). Phys. Rev. A. 75 (6): 060101. Bibcode:2007PhRvA

Physiology of decompression (13,601 words) [view diff] exact match in snippet view article find links to article

also diffuses faster due to the relatively small size and mass of the helium atom in comparison with the nitrogen molecule. Breathing gas composition is

The Scale of the Universe (423 words) [view diff] exact match in snippet view article find links to article

10−12 meters 10−12 meters Electron compton wavelength 2 × 10−12 meters — Helium atom 3.1 × 10−11 meters 2.5 × 10−11 meters Hydrogen atom 2.5 × 10−11 meters