Positronium hydride

Positronium hydride
Names
	IUPAC name Positronium hydride
Identifiers
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:46711;
	SMILES [Ps][H];
Properties
Chemical formula	PsH
Molar mass	1.00794
Appearance	Maybe gas
Structure
Molecular shape	Diatomic molecule
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Positronium hydride, or hydrogen positride^[3] is an exotic molecule consisting of a hydrogen atom bound to an exotic atom of positronium (that is a combination of an electron and a positron). Its formula is PsH. It was predicted to exist in 1951 by A. Ore,^[4] and subsequently studied theoretically, but was not observed until 1990. R. Pareja, R. Gonzalez from Madrid trapped positronium in hydrogen-laden magnesia crystals. The trap was prepared by Yok Chen from the Oak Ridge National Laboratory.^[5] In this experiment the positrons were thermalized so that they were not traveling at high speed, and they then reacted with H⁻ ions in the crystal.^[6] In 1992 it was created in an experiment done by David M. Schrader and F.M. Jacobsen and others at the Aarhus University in Denmark. The researchers made the positronium hydride molecules by firing intense bursts of positrons into methane, which has the highest density of hydrogen atoms. Upon slowing down, the positrons were captured by ordinary electrons to form positronium atoms which then reacted with hydrogen atoms from the methane.^[7]

^ "positronium hydride". ebi.ac.uk. Archived from the original on 2018-04-03. Retrieved 2017-07-21.
^ Cite error: The named reference Saito was invoked but never defined (see the help page).
^ Cite error: The named reference Usukura was invoked but never defined (see the help page).
^ Usukura, J.; Varga, K.; Suzuki, Y. (1998). "Signature of the existence of the positronium molecule". Physical Review A. 58 (3): 1918. arXiv:physics/9804023. Bibcode:1998PhRvA..58.1918U. doi:10.1103/PhysRevA.58.1918. S2CID 11941483.
^ "FY 1992 Accomplishments - "Out of This World" Chemical Compound Observed" (PDF). p. 9.
^ Monge, M. A.; R. Pareja; R. González; Y. Chen (1996). "Positronium deuteride and hydride in MgO crystals". Journal of Radioanalytical and Nuclear Chemistry. 211 (1): 23–29. Bibcode:1996JRNC..211...23M. doi:10.1007/BF02036251. ISSN 0236-5731. S2CID 96576192.
^ Schrader, D. M.; Jacobson, Finn M.; Niels-Peter, Niels-Peter; Mikkelsen, Ulrik (1992). "Formation of Positronium Hydride". Physical Review Letters. 69 (1): 57–60. Bibcode:1992PhRvL..69...57S. doi:10.1103/PhysRevLett.69.57. PMID 10046188.

[1] "positronium hydride". ebi.ac.uk. Archived from the original on 2018-04-03. Retrieved 2017-07-21.

[Saito-2] Cite error: The named reference Saito was invoked but never defined (see the help page).

[Usukura-3] Cite error: The named reference Usukura was invoked but never defined (see the help page).

[4] Usukura, J.; Varga, K.; Suzuki, Y. (1998). "Signature of the existence of the positronium molecule". Physical Review A. 58 (3): 1918. arXiv:physics/9804023. Bibcode:1998PhRvA..58.1918U. doi:10.1103/PhysRevA.58.1918. S2CID 11941483.

[5] "FY 1992 Accomplishments - "Out of This World" Chemical Compound Observed" (PDF). p. 9.

[Monge1996-6] Monge, M. A.; R. Pareja; R. González; Y. Chen (1996). "Positronium deuteride and hydride in MgO crystals". Journal of Radioanalytical and Nuclear Chemistry. 211 (1): 23–29. Bibcode:1996JRNC..211...23M. doi:10.1007/BF02036251. ISSN 0236-5731. S2CID 96576192.

[7] Schrader, D. M.; Jacobson, Finn M.; Niels-Peter, Niels-Peter; Mikkelsen, Ulrik (1992). "Formation of Positronium Hydride". Physical Review Letters. 69 (1): 57–60. Bibcode:1992PhRvL..69...57S. doi:10.1103/PhysRevLett.69.57. PMID 10046188.

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