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positronium

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positronium
positronium Nuclear Physics. (pɒzɪˈtrəʊnɪəm) [f. prec. + -ium.] A short-lived neutral system, analogous to an atom, consisting of a positron and a negative electron bound together.1945 A. E. Ruark in Physical Rev. LXVIII. 278/1 In 1937 I conceived the idea that an unstable atom composed of a positro... Oxford English Dictionary
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Positronium
Exotic compounds Molecular bonding was predicted for positronium. Molecules of positronium hydride (PsH) can be made. The annihilation of positronium - The Feynman Lectures on Physics The Search for Positronium Obituary of Martin Deutsch, discoverer of Positronium wikipedia.org
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Positronium hydride
The positronium in the molecule is swollen compared to the positronium atom, increasing to 3.48 a0 compared to 3 a0. Other substances that contain positronium are di-positronium and the ion Ps− with two electrons. wikipedia.org
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Di-positronium
Di-positronium, or dipositronium, is an exotic molecule consisting of two atoms of positronium. See also Hydrogen molecule Hydrogen molecular ion Positronium Protonium Exotic atom References External links Molecules of Positronium Observed in the wikipedia.org
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toponium
toponium Particle Physics. (tɒˈpəʊnɪəm) [f. top n.1 + -onium, after positronium.] A bound state of a top quark and a top anti-quark.1978 Nature 28 Sept. 268/2 This gives the prospect of detailed investigation of quark dynamics by studying transitions among these levels of ‘toponium’ analogous to tra... Oxford English Dictionary
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-onium
-onium, suffix [abstracted from ammonium.] 1. Chem. Used in forming the names of complex cations that contain a more or less electronegative central atom, usu. bonded to a number of protons (or to other species that are regarded as substituents), as arsonium, carbonium, hydrazonium, nitronium, oxoni... Oxford English Dictionary
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Positron annihilation spectroscopy
Theory The technique operates on the principle that a positron or positronium will annihilate through interaction with electrons. Positronium is a metastable hydrogen-like bound state of an electron and a positron which can exist in two spin states. wikipedia.org
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quarkonium
quarkonium, n. Particle Physics. (kwɑːˈkəʊnɪəm) Pl. -ia. [f. quark n.2 + -onium 2.] A meson consisting of a quark bound to the corresponding antiquark; matter, or a system, consisting of such a particle or particles.1977 Quigg & Rosner in Physics Lett. B. LXXI. 153/1 In this note we describe some fe... Oxford English Dictionary
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muonium
muonium Nuclear Physics. (mjuːˈəʊnɪəm) [f. muon + -ium, after positronium.] A short-lived neutral system, analogous to an atom, consisting of a (usu. positive) muon bound to an electron.1957 Friedman & Telegdi in Physical Rev. CV. 1681/2, µ+ can form ‘muonium’, i.e. (µ+e-). 1960 Physical Rev. Lett. ... Oxford English Dictionary
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Exotic atom
Positronium has been studied since the 1950s to understand bound states in quantum field theory. Di-positronium, two bound positronium atoms Positronium hydride, a positronium atom bound to a hydrogen atom "Exotic molecule" can also refer to a molecule wikipedia.org
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双电子偶素
参考资料 外部连结 Molecules of Positronium Observed in the Laboratory for the First Time Mirror particles form new matter 奇异原子 电子偶素 电子偶素化合物 分子 量子电动力学 2000 wikipedia.org
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Bohr radius
This result can be generalized to other systems, such as positronium (an electron orbiting a positron) and muonium (an electron orbiting an anti-muon) For example, the radius of positronium is approximately , since the reduced mass of the positronium system is half the electron mass (). wikipedia.org
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电子偶素
单态（1S0，自旋相反，总自旋为0）即仲电子偶素（para-positronium，简记为p-Ps），三重态（3S1，自旋同向,总自旋为1）即正电子偶素（ortho-positronium，简记为o-Ps）。 wikipedia.org
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Onium
Examples Positronium is an onium which consists of an electron and a positron bound together as a long-lived metastable state. Positronium has been studied since the 1950s to understand bound states in quantum field theory. wikipedia.org
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ATRAP experiment
Within the crystal there is a possibility that a positively charged positron and a negatively charged electron form a Rydberg Positronium atom. When the loosely bound Rydberg positronium atom reaches the Penning trap at the end of the apparatus, it is ionized and the positron is caught in the trap wikipedia.org
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