It is shown that the Anderson Hamiltonian is one of the Hamiltonians which can be solved exactly by means of the Bethe ansatz method. The thermodynamic quantities calculated on the basis of the exact solution are the magnetic susceptibility and the electronic specific heat.
We present exact numerical results for the thermodyamic properties of a 4-level Anderson model. Ground state and excited states energies, average occupation numbers, susceptibility, specific heat, spin and charge fluctuations, spin-spin correlation functions are derived. The results are presented as a function of the temperature for several values of the Coulomb repulsion integral. Drastic changes of the calculated quantities appear in correspondence of the excited state energies for some critical values of the parameters. The results are in qualitative agreement with some other Anderson model calculations.