Helium hydride ion

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The helium hydride ion or helium hydride ion (HeH + ) is a monovalent cation with a bond length of 0.772 Å. It is created by the reaction of a helium atom with a proton and forms the strongest possible acid , as the proton is given off to every neutral molecule on contact . It was first described in the laboratory in 1925. It is considered to be the first molecule that was formed in the universe almost 14 billion years ago. In 2019 it was first detected astrophysically by researchers from the Max Planck Institute for Radio Astronomy in Bonn in the 3000 light-years distant planetary nebula NGC 7027 .

Individual evidence

  1. ↑ Ball, DW, Coyne, JP: Alpha particle chemistry. On the formation of stable complexes between He2 + and other simplespecies: implications for atmospheric and interstellar chemistry . Ed .: J. Mol. Model. Springer, 2008, p. 35-40 , doi : 10.1007 / s00894-008-0371-3 .
  2. ^ TR Hogness, EG Lunn: The Ionization of Hydrogen by Electron Impact as Interpreted by Positive Ray Analysis . In: Physical Review . 26, No. 1, 1925, pp. 44-55. bibcode : 1925PhRv ... 26 ... 44H . doi : 10.1103 / PhysRev.26.44 .
  3. ↑ First astrophysical evidence of Heliumhydrid ion Max Planck Institute for Radio Astronomy, from April 17, 2019
  4. ↑ joe / dpa: Astronomy: Oldest molecule in the universe proven. In: Spiegel Online . April 17, 2019, accessed April 18, 2019 .
  5. ↑ Nadja Podbregar: First ion of the universe detected. In: scinexx.de. April 18, 2019, accessed April 18, 2019 .
  6. ↑ ZEIT ONLINE: Space: Astronomers discover molecules from the origin of the universe . In: The time . April 18, 2019, ISSN  0044-2070 ( zeit.de [accessed April 18, 2019]).