Hartree Units definition of Hartree Units in the Free Online Encyclopedia.

Hartree units [′här·trē ‚yü·nəts]

(atomic physics)

A system of units in which the unit of angular momentum is Planck's constant divided by 2π, the unit of mass is the mass of the electron, and the unit of charge is the charge of the electron. Also known as atomic units.

Hartree Units

(also atomic units), a natural system of units in which the following fundamental physical constants are set equal to unity: the charge e and mass m_e of the electron (e = 1.6021892 × 10^–19 coulombs and m_e = 0.9109534 × 10^–30 kg), the Bohr radius a₀ = 0.52917706 × 10^–10 m, and Planck’s constant ħ = h/2π = 1.0545887 ×, 10^–34 joules-sec. In other words, a₀ is taken as the unit of length, m_e is taken as the unit of mass, and the unit of time is approximately equal to 2.419 × 10^–17 sec. The use of Hartree units makes it possible to simplify the equations of quantum mechanics. The units were proposed by the English physicist D. Hartree in 1928.

REFERENCES

Dolinskii, E. F., and B. I. Pilipchuk. “Estestvennye sistemy edinits.” In Entsiklopediia izmerenii, kontrolia i avtomatiki (EIKA), fase. 4. Moscow-Leningrad, 1965. Pages 3–8.
Burdun, G. D. Spravochnik po mezhdunarodnoi sisteme edinits. Moscow, 1971. Page 195.

Mentioned in	?		Encyclopedia browser	?		Full browser	?
No references found			Hartline, H. Keffer Hartline, Haldan Keffer Hartman Creek State Park Hartman's solution Hartman, Rev. Curtis Hartmann diaphragm Hartmann dispersion formula Hartmann flow Hartmann generator Hartmann lines Hartmann number Hartmann Oscillator Hartmann Screen Hartmann test Hartmann von Aue Hartmann, Carl Sadakichi Hartmann, Eduard Von Hartmann, Heinz Hartmann, Moritz Hartmann, Nicolai Hartnell hartree Hartree energy Hartree equation Hartree method Hartree Units Hartree, Douglas R Hartree-Fock approximation hartshorn oil hartshorn salts hartshorn, spirits of Hartshorne, Richard Hartsook, Ralph Hartt, C. Fred Hartt, Frederick Hartung, Hans Hartwell, Leland H. Hartwick Pines State Park Harum, David Harumaph Harun al-Rashid Harunobu Suzuki Harunobu, Suzuki Haruspices Haruz Harvard Harvard architecture Harvard College Observatory Harvard Graphics Harvard Lampoon Harvard Mark II Machine			Hartmann's operation Hartmann's operation Hartmann's operation Hartmann's operation Hartmann's pouch Hartmann's procedure Hartmann's Solution Hartmann, Carl Sadakichi Hartmann, Eduard von Hartmann, Heinz Hartmann, Moritz Hartmann, Nicolai Hartmann-Rudolph Hartmannella hartmannelliasis Hartmath for Windows CE Hartmut Dieterle Business Solutions Hartnell Hartnell Hartnup disease Hartnup disease Hartnup disease Hartnup disease Hartnup disorder Hartnup's disease HartRAO Hartree Hartree energy Hartree equation Hartree method Hartree Units Hartree, Douglas R Hartree-Fock Hartree-Fock Hartree-Fock + Bardeen-Cooper-Schrieffer Hartree-Fock approximation Hartree-Fock Dispersion-B Hartree-Fock Frozen Core Hartree-Fock Molecular Orbital Linear Combination of Atomic Orbitals Hartree-Fock Perturbation Theory Hartree-Fock Pseudopotential Hartree-Fock Rayleigh-Schroedinger Perturbation Theory Hartree-Fock Self-Consistent Field Hartree-Fock Slater Hartree-Fock-Dirac-Roothaan Hartree-Fock-Dispersion with Repulsive Self Consistent Field Component Hartree-Fock-Jucys Hartree-Fock-Kohn-Sham Hartree-Fock-Wigner-Seitz harts harts harts harts harts Hartsdale Fire Department Hartsfield - Jackson Atlanta International Airport