## Eigenvalue plots Tannoudji's Quantum Mechanics Vol. II

Hi guys,

probably that's the wrong forum, but I was just curious about
the plot (Figure 1 Chapter XI A./1. page 1097 / Volume II) of the eigenvalues

$$E(\lambda)$$.

If I calculate them they are supposed to be straight lines with positive or
negative slope i.e.:

$$E(\lambda) = E_n^0 + \lambda \epsilon_1^j$$

in first order perturbation theory.

Am I missing s.th. or are these curves just ment to be realistic measurement curves
(and if so why isn't there any hint in the text) ?
 PhysOrg.com physics news on PhysOrg.com >> Is there an invisible tug-of-war behind bad hearts and power outages?>> Penetrating the quantum nature of magnetism>> Rethinking the universe: Groundbreaking theory proposed in 1997 suggests a 'multiverse'
 If you calculate higher order corrections to the energy you will also have term of order $$\lambda^2$$ and higher. So the exact value of E(lambda) is not given by a straight line, but some curve instead. The plot gives an example of what the exact value of E(lambda) might be.
 Thank you very much, it's all about detail

 Similar discussions for: Eigenvalue plots Tannoudji's Quantum Mechanics Vol. II Thread Forum Replies Introductory Physics Homework 6 Science Textbook Discussion 2 Advanced Physics Homework 0