Corrections to the Wavefunction

  These wavefunctions which are needed to obtain the energies can be constructed as a linear combination of elements of some complete basis. The exact solutions to provide a convenient, although certainly not unique, choice for a complete orthonormal basis.
 
We are thus left with the task of determining these expansion coefficients. To find an expansion coefficient , we expand Eqns 16 - 19 using Eqn 26 and then left project by the appropriate element of the basis . The reason for the constraint will soon become apparent.

 
• 1st Order Correction to the Wavefunction
• 2nd Order Correction to the Wavefunction
• kth Order Correction to the Wavefunction