Energy Loss Beyond Perturbation Theory

Avenida Bento Goncalves 9500, 91501-970, Porto Alegre, Brazil 2 Bereich SF, Hahn-Meitner-lnstitut Berlin, Glienicker Str. 100, 

A review is given on the application of the coupled-channel method for the calculation of the electronic energy loss of ions as well as ionization in matter. This first principle calculation, based on the solution of the time-dependent Schrodinger equation, has been apphed to evaluate the impact parameter and angular dependence of the electronic and nuclear energy losses of ions as well as the ionization due to high-power short laser pulses. The results are compared to experimental data as well as to other current theoretical models. 

What have we learned from coupled-channel calculations Acknowledgements 

These benchmark calculations have also been used to check simplified models that account for the basic energy loss processes without the need of large scale calculations [25,26] and to calculate the probability of multiphoton ionization in the case of intense fs-laser pulses [27]. 

The chapter is organized as follows. The principle of the coupled-channel method is reviewed in detail in Section 2. The results are discussed in connection to higher order terms in Section 3. The application to multiphoton ionization is described in Section 4. Comparisons with measurements are provided in Section 5. A simple model for the electronic energy loss is 

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Ionization and Energy Loss Beyond Perturbation Theory... 

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