Talk:Born–Huang approximation
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There are some serious problems with this page. First, if we intend with "Born-Huang approximation" the adiabatic approximation (i.e., nuclei moving in the potential given by the clamped nuclei hamiltonian + adiabatic correction, aka Born-Oppenheimer diagonal correction) then it does not make any sense to say that it include "part of the non-adiabatic effects" (it doesn't) nor that it is "rarely used to account for non-adiabatic effects" (it's can't). Maybe what was intend was the Born-Huang approach to the separation of motions of the nuclei. Second, the fact that the BO and BH energies bracket the real energy is always always USELESS. It isn't a "very efficient way to validate the BO approx." as it is states in the article! This is because in almost all cases (i.e.: all cases a part from 2-3 electron systems) one only cares about relative energies, and for these there is no variational principle. — Preceding unsigned comment added by L0rents (talk • contribs) 23:01, 2 December 2012 (UTC)
Is not complete/correct English - Edit required
[edit]Second sentence "It takes into account diagonal nonadiabatic effects in the electronic Hamiltonian than the Born–Oppenheimer approximation." is 'broken' English. Since I do not know what author meant to say, I can not correct it. I suspect s/he may have meant "compared with" but mistakenly used "than". If so, it would be better, imho, to state: "It takes into account diagonal nonadiabatic effects in the electronic Hamiltonian while the Born–Oppenheimer approximation does not."72.172.1.250 (talk) 10:53, 26 August 2013 (UTC)
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