2-LEVEL SYSTEM IN A ONE-MODE QUANTUM-FIELD - NUMERICAL-SOLUTION ON THE BASIS OF THE OPERATOR METHOD

Accurate eigenvalues and eigenfunctions of a two-level system interact ing with a one-mode quantum field are calculated numerically. A specia l iteration procedure based on the operator method permits one to cons ider the solution within a wide range of the Hamiltonian parameters an d to find the uniformly approximating analytical formula for the eigen values. Characteristic features of the model are considered, such as t he level intersections, the population of the field states and the cha otization in the system through the doubling of the frequencies.