rd  - 1962 - ENC Conference

First-order perturbation theory gives for the energy level number ~ !,
L ~ . Thus the first-order corrections
to the transitions energies are given by the differences of the form
•
Below the results for the ABC system~it is hoped~are given in
sufficient detail to be understandable. The results for the ABC and
A2B 2 systems were derived by us sometime ago, but they have not been
exhaustively checked for algebraic errors. We present them here for what
they are worth to the practicing NMR spectroscopist. We have also
obtained the perturbation expressions for the transitions of the ABC and
A2~ systems which are easily derivable from the energy level perturbations
given here. We have similar results for the ABX, A2X2J ABC B and ABX 3
systems. We hope to make this work generally available soon either as a
JPL report or external publication.
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