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    Atomic units - Wikipedia

    • The atomic units are a 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. Atomic units are often abbreviated "a.u." or "au", not to be con… See more

    Motivation

    In the context of atomic physics, using the atomic units system can be a convenient shortcut, eliminating symbols and … See more

    History

    Hartree defined units based on three physical constants:
    Both in order to eliminate various universal constants from the equations and also to avoid high powers of 10 in numerical work, it is conven… See more

    Definition

    A set of base units in the atomic system as in one proposal are the electron rest mass, the magnitude of the electronic charge, the Planck constant, and the permittivity. In the atomic units system, each of these takes the value 1… See more

    Do atoms are the basic units of matter?
    The basic unit of all matter is the atom. The atom is the smallest unit of matter that can't be divided using any chemical means and the building block that has unique properties. In other words, an atom of each element is different from an atom of any other element.
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    Units

    Three of the defining constants (reduced Planck constant, elementary charge, and electron rest mass) are atomic units themselves – of action, electric charge, and mass, respectively. Two named units are those of … See more

    Conventions

    Different conventions are adopted in the use of atomic units, which vary in presentation, formality and convenience.
    • Many texts (e.g. Jerrard & McNiell, Shull & Hall ) define the atomic units as quantities, without a tr… See more

    Physical constants

    Dimensionless physical constants retain their values in any system of units. Of note is the fine-structure constant ⁠⁠, which appears in expressions as a consequence of the choice of units. For example, the numeric value of the … See more

    Bohr model in atomic units

    Atomic units are chosen to reflect the properties of electrons in atoms, which is particularly clear in the classical Bohr model of the hydrogen atom for the bound electron in its ground state:
    • Mass … See more

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    Table of Contents
    Motivation
    History
    Definition
    Do atoms are the basic units of matter?
    Units
    Conventions
    Physical constants
     
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