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Atomic units
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{{short description|System of measurement}} {{distinguish|atomic mass units}} The '''atomic units''' are a [[systems of measurement|system]] of [[natural units]] of measurement that is especially convenient for calculations in [[atomic physics]] and related scientific fields, such as [[computational chemistry]] and [[atomic spectroscopy]]. They were originally suggested and named by the physicist [[Douglas Hartree]].<ref name="Hartree1928">{{citation | last1=Hartree | first1=D. R. | authorlink1=Douglas Hartree | title=The Wave Mechanics of an Atom with a Non-Coulomb Central Field. Part I. Theory and Methods | year=1928 | journal=[[Mathematical Proceedings of the Cambridge Philosophical Society]] | publisher=Cambridge University Press | volume=24 | issue=1 | pages=89β110 | url=http://journals.cambridge.org/action/displayAbstract?aid=1733252 | doi=10.1017/S0305004100011919 |bibcode = 1928PCPS...24...89H |s2cid=122077124 }}</ref> Atomic units are often abbreviated "a.u." or "au", not to be confused with similar abbreviations used for [[astronomical unit]]s, [[arbitrary unit]]s, and [[absorbance|absorbance units]] in other contexts.
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