Perturbation / Variational



Greetings all,
 
[1] Suppose that a Hartree-Fock wavefunction W_tot is obtained for some Hamiltonian H_tot = H_0 + H_1 where H_1 is a "small" perturbation.
 
[2] Assuming that I can get the wavefunction W_0 from H_0.
 
Can I safely assume that the first order correction can be calculated as
W_(1) = W_tot - W_0 ?
 
References, suggestions, comments, ... are welcome
 
 
Boufarik 



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