The atomic units are a system of natural units of measurement that is especially convenient for calculations in atomic physics and related scientific fields...

The dalton or unified atomic mass unit (symbols: Da or u) is a non-SI unit of mass defined as 1/12 of the mass of an unbound neutral atom of carbon-12...

Constants, Units, and Uncertainty. NIST. Retrieved 2023-12-31. "2018 CODATA Value: atomic unit of time". The NIST Reference on Constants, Units, and Uncertainty...

The atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is the kilogram (symbol: kg), atomic mass is often expressed in the non-SI...

radius. Just as atomic units are given in terms of the atomic mass unit (approximately the proton mass), the physically appropriate unit of length here...

hartree (symbol: Eh), also known as the Hartree energy, is the unit of energy in the atomic units system, named after the British physicist Douglas Hartree...

A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating...

even after the 2019 redefinition of the SI base units. For a single given sample, the relative atomic mass of a given element is the weighted arithmetic...

used as a unit of mass. The Hartree (the atomic unit of energy) is commonly used in the field of computational chemistry since such units arise directly...

p. 339 https://www.phys.ksu.edu/personal/cdlin/class/class11a-amo2/atomic_units.pdf [bare URL PDF] CODATA Value: atomic unit of electric field v t e...