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In the [[Hartree-Fock method]] of [[quantum mechanics]], the '''Fock matrix''' is a [[matrix (mathematics)|matrix]] approximating the single-electron [[energy operator]] of a given [[Quantum mechanics|quantum]] system in a given set of [[basis set|basis]] vectors.<ref>{{Cite book|first=J.|last= Callaway|title=Quantum Theory of the Solid State|publisher= Academic Press|location= New York|year=1974|url=http://books.google.com/books/about/Quantum_theory_of_the_solid_state.html?id=HKTvAAAAMAAJ|isbn=9780121552039}}</ref>
 
It is most often formed in [[computational chemistry]] when attempting to solve the [[Roothaan equations]] for an atomic or molecular system. The Fock matrix is actually an approximation to the true [[Hamiltonian (quantum theory)|Hamiltonian]] [[Operator (mathematics)|operator]] of the quantum system. It includes the effects of [[electron|electron-electron]] [[Coulomb force|repulsion]] only in an average way.  Importantly, because the Fock operator is a one-electron operator, it does not include the [[electron correlation]] energy.
 
The Fock matrix is defined by the ''Fock operator''. For the restricted case which assumes [[closed-shell]] [[atomic orbital|orbitals]] and single-determinantal wavefunctions, the Fock operator for the ''i''-th electron is given by:<ref>Levine, I.N. (1991) ''Quantum Chemistry'' (4th ed., Prentice-Hall), p.403</ref>
 
:<math>\hat F(i) = \hat h(i)+\sum_{ j=1 }^{n/2}[2 \hat J_j(i)-\hat
K_j(i)]</math>
 
where:
 
:<math>\hat F(i)</math> is the Fock operator for the ''i''-th electron in the system,
 
:<math>{\hat h}(i)</math> is the [[one-electron hamiltonian]] for the ''i''-th electron,
 
:<math>n</math> is the number of electrons and <math> \frac{n}{2} </math> is the number of occupied orbitals in the closed-shell system,
 
:<math>\hat J_j(i)</math> is the [[Coulomb operator]], defining the repulsive force between the ''j''-th and ''i''-th electrons in the system,
 
:<math>\hat K_j(i)</math> is the [[exchange operator]], defining the quantum effect produced by exchanging two electrons.
 
The Coulomb operator is multiplied by two since there are two electrons in each occupied orbital. The exchange operator is not multiplied by two since it has a non-zero result only for electrons which have the same spin as the ''i''-th electron.
 
For systems with unpaired electrons there are many choices of Fock matrices.
 
==References==
{{Reflist}}
 
==See also==
*[[Hartree-Fock]]
*[[Unrestricted Hartree–Fock]]
*[[Restricted open-shell Hartree–Fock]]
 
{{DEFAULTSORT:Fock Matrix}}
[[Category:Atomic, molecular, and optical physics]]
[[Category:Quantum chemistry]]
[[Category:Matrices]]
 
{{Physics-stub}}

Latest revision as of 22:51, 12 December 2014

Luke Bryan is a superstar within the producing and the job expansion initially next to his third studio record, & , will be the evidence. He burst to the picture in 1999 regarding his unique blend of straight down-house ease of access, movie star great looks and words, is placed t within a key way. The newest re in the region graph or chart and #2 on the put graphs, creating it the second greatest debut in those days of 2015 for any land musician.

The son of a , is aware determination and determination are key elements when it comes to a successful career- . His initially recording, Remain Me, produced the most notable strikes “All My Friends Say” and “Country Guy,” while his effort, Doin’ Point, discovered the vocalist-three right No. 1 men and kenny chesney pittsburgh women: Else Phoning Can be a Fantastic Issue.”

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