Atomic Units

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HandWiki. Atomic Units. Encyclopedia. Available online: https://encyclopedia.pub/entry/33814 (accessed on 23 September 2026).

HandWiki. Atomic Units. Encyclopedia. Available at: https://encyclopedia.pub/entry/33814. Accessed September 23, 2026.

HandWiki. "Atomic Units" Encyclopedia, https://encyclopedia.pub/entry/33814 (accessed September 23, 2026).

HandWiki. (2022, November 10). Atomic Units. In Encyclopedia. https://encyclopedia.pub/entry/33814

HandWiki. "Atomic Units." Encyclopedia. Web. 10 November, 2022.

Atomic Units

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The content is sourced from: https://handwiki.org/wiki/Physics:Atomic_units

Atomic units (au or a.u.) form a system of natural units which is especially convenient for atomic physics calculations. There are two different kinds of atomic units, Hartree atomic units and Rydberg atomic units, which differ in the choice of the unit of mass and charge. This article deals with Hartree atomic units, where the numerical values of the following four fundamental physical constants are all unity by definition: In Hartree units, the speed of light is approximately [math]\displaystyle{ 137 }[/math]. Atomic units are often abbreviated "a.u." or "au", not to be confused with the same abbreviation used also for astronomical units, arbitrary units, and absorbance units in different contexts.

natural units atomic physics a.u.

References

Pilar, Frank L. (2001). Elementary Quantum Chemistry. Dover Publications. p. 155. ISBN 978-0-486-41464-5. https://books.google.com/books?id=XpGM7r69LdkC&pg=PA155.
Bishop, David M. (1993). Group Theory and Chemistry. Dover Publications. p. 217. ISBN 978-0-486-67355-4. https://books.google.com/books?id=l4zv4dukBT0C&pg=PA217.
Drake, Gordon W. F. (2006). Springer Handbook of Atomic, Molecular, and Optical Physics (2nd ed.). Springer. p. 5. ISBN 978-0-387-20802-2. https://books.google.com/books?id=Jj-ad_2aNOAC&pg=PA5.
"The NIST Reference on Constants, Units and Uncertainty". National Institute of Standard and Technology. http://physics.nist.gov/cuu/index.html. Retrieved 1 April 2012.
"The NIST Reference on Constants, Units and Uncertainty". National Institute of Standard and Technology. http://physics.nist.gov/cgi-bin/cuu/Value?bohrrada0. Retrieved 21 January 2014.
"The NIST Reference on Constants, Units and Uncertainty". National Institute of Standard and Technology. http://physics.nist.gov/cgi-bin/cuu/Value?aumom. Retrieved 29 October 2017.
"A note on Units". Physics 7550 — Atomic and Molecular Spectra. University of Colorado lecture notes. http://www.colorado.edu/physics/phys7550/phys7550_sp07/extras/Appendix_1.pdf.
Chis, Vasile. "Atomic Units; Molecular Hamiltonian; Born-Oppenheimer Approximation". Molecular Structure and Properties Calculations. Babes-Bolyai University lecture notes. http://phys.ubbcluj.ro/~vchis/cursuri/cspm/course2.pdf.
Budker, Dmitry; Kimball, Derek F.; DeMille, David P. (2004). Atomic Physics: An Exploration through Problems and Solutions. Oxford University Press. p. 380. ISBN 978-0-19-850950-9. https://books.google.com/books?id=GW6pclAk-JcC&pg=PA380.

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