Download Angle and Spin Resolved Auger Emission: Theory and by Bernd Lohmann PDF

By Bernd Lohmann

Attitude and spin resolved Auger emission physics offers with the theoretical and numerical description, research and interpretation of such sorts of experiments on loose atoms and molecules. This monograph derives the overall idea utilizing the density matrix formalism and, by way of irreducible tensorial units, so known as nation multipoles and order parameters, for parameterizing the atomic and molecular structures, respectively. it's the first publication on attitude and spin-resolved Auger emission.

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Extra resources for Angle and Spin Resolved Auger Emission: Theory and Applications to Atoms and Molecules (Springer Series on Atomic, Optical, and Plasma Physics)

Example text

Thus, only the y-component of the spin polarization vector of the Auger electrons can be nonzero. Ionization with Linearly Polarized Photons Here, we make use of the law of superposition. An electric field vector E oscillating in an arbitrary but fixed direction perpendicular to the reaction plane can always be split into two components. One component oscillating perpendicular and one oscillating in the reaction plane (see Fig. 6). It should be noted that due to its rapid 18 2 Theory Fig. 6. 1.

The magnetic component of the state multipoles T (J )+ KQ describing the inter+ mediate ionic state must be the same as for the state multipoles tkq of the emitted Auger electrons. Considering the fact that electrons are spin 1/2 particles, the rank + must be restricted to of the state multipoles tkq k ≤ 1. 111) we get the important limitation |Q| = |q| ≤ 1. 113) With this and using Lohmann (1990) we define the generalized anisotropy parameter A(KkQ) as + A(KkQ) = tr V T (J )KQ V + tkq δQ,q . 107) vanishes and using the anisotropy parameters we eventually get + I tkQ = T (J )+ KQ A(KkQ).

The dynamics of the primary ipoles tkQ onization/excitation is fully described by the state multipoles T (J )+ KQ . They have been extensively discussed in Sect. 3 for a variety of excitation and ionization + and the anisotropy parameters A(KkQ) processes. e. the quantization axis is the direction of Auger emission. The state multipoles T (J )+ KQ describing the primary ionization/excitation process refer to the primary beam axis as quantization axis. The angular depen(K) dency of both frames is expressed in terms of reduced rotation matrices dQ Q (θ ).

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