An alternative method to the density matrix formalism for the derivation of general expressions for the cross-sections of the interaction of polarized atoms with polarized photons and electrons is presented. The expression for the cross-section describing the polarization states of all particles taking part in the process are obtained in the form of the expansion via irreducible tensors that have the simplest possible behaviour under changes of directions. The ways of the application of the general expressions suitable for the specific experimental conditions are outlined by deriving asymmetry parameters of the angular distributions of photoelectrons and Auger electrons following photoionization as well as the parameters of the angular correlations between photo- and Auger electrons.

/pdf/atomic-theory-methods-for-the-polarization-in-photon-and-3xopvvg18w.pdf

Atomic theory methods for the polarization in photon and electron interactions with atoms

http://www-old.mpi-halle.mpg.de/mpi/publi/pdf/126_01.pdf

Chiral multi-electron emission

An expression for the probability of the excitation of polarized atoms by polarized radiation is obtained by using the graphical technique of angular momentum. In the case of pure states, the applied method is an alternative to that of density matrix formalism. The obtained expression enables one to describe the polarization state of an excited atom and can be used to derive formulas for the special cases under specific experimental conditions as well as for the photoexcitation as the first step process. The application of obtained expressions for the description of multistep processes is discussed. The photoexcitation of unpolarized atoms by polarized radiation and polarized atoms by unpolarized radiation is considered as the examples of practical application of the obtained general expression.

/pdf/photoexcitation-of-polarized-atoms-by-polarized-radiation-4q7rahxd2p.pdf

Photoexcitation of polarized atoms by polarized radiation

An alternative method to the density matrix formalism for the derivation of general expressions of the interaction of polarized atoms with polarized photons and electrons is presented. The expression for the cross-section describing the polarization states of all particles taking part in the process are obtained in the form of an expansion via irreducible tensors that have the most simplest possible behaviour under changes of directions. The ways of the application of the general expressions suitable for the specific experimental conditions are outlined by deriving asymmetry parameters of the angular distributions of photoelectrons and Auger electrons following photoionization as well as the parameters of the angular correlations between photo- and Auger electrons.

/pdf/atomic-theory-methods-for-the-polarization-in-photon-and-10zvc6fj8l.pdf

We investigate the spin-polarized electron impact ionization of laser-excited alkali atoms. The triply differential cross section is decomposed into orientation and alignment parameters which can be directly measured. This paper extends a theoretical frame recently developed for unpolarized electrons.

? from laser-excited atoms with spin-polarized electrons

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? from laser-excited atoms with spin-polarized electrons