## Abstract

In this and the following sections we consider applications of the density matrix and statistical tensor formalism to various atomic processes. We start from the simplest atomic reaction in which as a result of the interaction of two particles in the initial state only one particle (a “compound”system) is formed in the final state. A typical example of such a process is photoexcitation of a discrete atomic level. A compound system may also be formed in a scattering process as a sufficiently long-living intermediate state (resonance). We assume that the compound system has a certain energy and a total angular momentum. Our goal is to determine the polarization state of the compound system and to find out how it is related to the characteristics of the initial colliding partners.

## Keywords

Angular Momentum Density Matrix Angular Distribution Orbital Angular Momentum Atomic State## Preview

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