Beryllium monohydride (BeH) is an example of a molecule with a half-bond order according to molecular orbital theory. It is a metastable monoradical species which has only been observed in the gas phase. In beryllium monohydride, beryllium has a valency of one, and hydrogen has a valency of one.
BeH has only 5 electrons and is the simplest open shell neutral molecule, and is therefore extremely important for the benchmarking of ab initio methods. With such a light mass, it is also an important benchmark system for studying the breakdown of the Born-Oppenheimer approximation. Due to its simplicity, BeH is expected to be present in astronomical contexts such as exoplanetary atmospheres, cool stars, and the interstellar medium, but so far has only been found on the Sun.[2] Because of the long lifetime (by nuclear physics standards) of 11Be, 11BeH is the leading candidate for the formation of the first halo nucleonic molecule.[3]
BeH has been studied spectroscopically since 1928 and in over 80 theoretical studies (see [3] for a review).
The bond length is 134.2396(3) pm [3] and the dissociation energy is 17702(200) cm−1.[3]
The dimeric molecule Be2H2 has also been observed in an argon matrix at 10 K[4]
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For the census town, see Ramnagar (NPP). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Ramnagar, Nainital – news · newspapers · books · scholar · JSTOR (August 2012) (Learn how and when to remove this template message) Town in Uttarakhand, IndiaRamnagarTownKosi river flowing through Jim Corbett National Park …
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