Bernd Lohmann's Angle and Spin Resolved Auger Emission: Theory and PDF

By Bernd Lohmann

ISBN-10: 3540746293

ISBN-13: 9783540746294

Perspective and spin resolved Auger emission physics offers with the theoretical and numerical description, research and interpretation of such kinds of experiments on unfastened atoms and molecules. This monograph derives the final idea making use of the density matrix formalism and, when it comes to irreducible tensorial units, so known as kingdom multipoles and order parameters, for parameterizing the atomic and molecular platforms, respectively. it's the first booklet on perspective 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)

Sample text

103) where J M denotes the intermediate ionic state A+∗ . The final ionic state is described by Jf Mf and p(−) ms denotes the emitted Auger electron with momentum p and spin ms . The upper index (−) on p indicates that we are dealing with scattering solutions with incoming boundary conditions. Choosing the helicity system as coordinate frame, the density matrix ρˆ of the ion A+∗ can be expanded into a series of state multipoles T (J )+ KQ T (J )+ KQ T (J )KQ . g. Blum 1996) where V denotes the Coulomb operator.

115) 40 2 Theory The anisotropy parameters A(KkQ) show some useful symmetry relations. With the symmetries of the 3j -symbols we find A(Kk − Q) = A(KkQ)∗ . 116) Especially, all parameters A(Kk0) must be real numbers. Another relation can be obtained from reflection invariance. 117) where Rxz denotes the reflection operator. This yields (Lohmann 1990) A(KkQ) = (−1)K+k A(Kk − Q). 118) With the above symmetries we find that, depending on the rank of the state multipoles, the anisotropy parameters are either solely real or imaginary numbers, A(KkQ) = real, if K + k = even, imaginary, if K + k = odd.

27), we see that the tensor operators T (J J )KQ are purely geometrical quantities. e. the creation of an inner shell hole. Particularly, we consider the ionization and excitation process with arbitrarily polarized photons and electrons, respectively. g. e. a photoelectron is emitted into the continuum which leaves the atom in a singly ionized excited state. For the following, we assume the incoming photon beam as arbitrarily polarized, and the initial atomic ensemble as unpolarized. Since we are not considering coincidence experiments the emitted photoelectron is not detected.

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Angle and Spin Resolved Auger Emission: Theory and Applications to Atoms and Molecules (Springer Series on Atomic, Optical, and Plasma Physics) by Bernd Lohmann


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