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The dihelium hydride cation, He 2 H +, is formed by the reaction of dihelium cation with molecular hydrogen: He + 2 + H 2 → He 2 H + + H. It is a linear ion with hydrogen in the centre. [22] The hexahelium hydride ion, He 6 H +, is particularly stable. [22] Other helium hydride ions are known or have been studied theoretically.
The helium hydride ion, thought to be the earliest molecule to have been formed in the Universe (about 100,000 years after the Big Bang), was detected in 2019 for the first time in space in NGC 7027. [21] [22] There is also evidence for the presence of nanodiamond in NGC 7027. [23]
Discovery: Norman Lockyer (1868) First isolation: ... Helium was first detected as an unknown, ... Structure of the helium hydride ion, ...
The simplest is the helium hydride molecular ion, HeH +, discovered in 1925. [59] Because it is composed of the two most abundant elements in the universe, hydrogen and helium, it was believed to occur naturally in the interstellar medium, and it was finally detected in April 2019 using the airborne SOFIA telescope.
Helium is the smallest and the lightest noble gas and one of the most unreactive elements, so it was commonly considered that helium compounds cannot exist at all, or at least under normal conditions. [1] Helium's first ionization energy of 24.57 eV is the highest of any element. [2]
Pulsar Helium is a step closer to building Minnesota's first helium drilling operation after the company said lab tests confirmed a potent concentration of the gas from a well at an exploration ...
The first molecule detected in the interstellar medium was the methylidyne radical (CH •) in 1937, through its strong electronic transition at 4300 angstroms (in the optical). [4] Advances in astronomical instrumentation have led to increasing numbers of new detections.
Whereas the carbon–helium-ion bond breaks spontaneously and immediately to yield a carbocation, bonds of other elements to helium are more stable. For example, molecular tritium T 2 or tritium-hydrogen HT. On decay, these form a stable helium hydride ion [HeH] + (respectively [3 HeT] + or [3 HeH] +), which is stable enough to persist. This ...