parallel spins

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• Figure skating spins — Spins are an element in figure skating where the skater rotates, centered on a single point on the ice, while holding one or more body positions. The skater rotates on the part of the blade just behind the toe pick, with the weight on the ball of …   Wikipedia

• Ferromagnetism — Not to be confused with Ferrimagnetism; for an overview see Magnetism A magnet made of alnico, an iron alloy. Ferromagnetism is the physical theory which explains how materials become magnets. Ferromagnetism is the basic mechanism by which… …   Wikipedia

• chemical bonding — ▪ chemistry Introduction       any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …   Universalium

• Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… …   Wikipedia

• carbene — /kahr been/, n. the radical CH2 and its derivatives. [CARB + ENE] * * * ▪ chemistry Introduction       any member of a class of highly reactive molecules containing divalent carbon atoms that is, carbon atoms that utilize only two of the four… …   Universalium

• Transition metal — The term transition metal (sometimes also called a transition element) has two possible meanings: The IUPAC definition[1] states that a transition metal is an element whose atom has an incomplete d sub shell, or which can give rise to cations… …   Wikipedia

• Nitrogen-vacancy center — The nitrogen vacancy center (N V center) is one of numerous point defects in diamond. Its most explored and useful property is photoluminescence, which can be easily detected from an individual N V center. Electron spins at N V centers, localized …   Wikipedia

• photochemical reaction — Chemical reaction initiated by absorption of energy in the form of visible (light), ultraviolet, or infrared radiation. Primary photochemical processes occur as an immediate result, and secondary processes may follow. The most important example… …   Universalium

• Quantum chromodynamics — Standard model of particle physics Standard Model …   Wikipedia

• Positronium — (Ps) is a system consisting of an electron and its anti particle, a positron, bound together into an exotic atom . Being unstable, the two particles annihilate each other to produce two gamma ray photons after an average lifetime of 125 ps or… …   Wikipedia

• Exchange interaction — In physics, the exchange interaction is a quantum mechanical effect without classical analog which increases or decreases the expectation value of the energy or distance between two or more identical particles when their wave functions overlap.… …   Wikipedia