Difference between revisions of "Multi-electron excitation"
From Online Dictionary of Crystallography
BrianMcMahon (talk | contribs) m (moved Multi-electron excitations to Multi-electron excitation: Making headwords singular) |
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| + | <font color="red">Multielektronenanregung</font> (''Ge''). <font color="green">Excitación multiple electrónica</font> (''Sp''). | ||
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The assignment of a spectral feature as multi-electron excitation depends on the level of theory, ''i.e.'' how the electronic states are described. A general definition can be stated as follows: If there exists no one-electron operator that gives a matrix element unequal to zero between the reference state and an excited state, the latter must be multielectron in nature. The reference state is in most cases the ground state of the system. Some spectral features in XAFS are commonly denoted multi-electron spectral features and referred to as 'shake-up', ‘shake-down’ and 'shake-off' excitations. The amplitude reduction factor <math>S_0^2</math> in the EXAFS equation is included to consider multielectron excitations. | The assignment of a spectral feature as multi-electron excitation depends on the level of theory, ''i.e.'' how the electronic states are described. A general definition can be stated as follows: If there exists no one-electron operator that gives a matrix element unequal to zero between the reference state and an excited state, the latter must be multielectron in nature. The reference state is in most cases the ground state of the system. Some spectral features in XAFS are commonly denoted multi-electron spectral features and referred to as 'shake-up', ‘shake-down’ and 'shake-off' excitations. The amplitude reduction factor <math>S_0^2</math> in the EXAFS equation is included to consider multielectron excitations. | ||
[[Category: X-ray absorption spectroscopy]] | [[Category: X-ray absorption spectroscopy]] | ||
Latest revision as of 13:07, 16 November 2017
Multielektronenanregung (Ge). Excitación multiple electrónica (Sp).
The assignment of a spectral feature as multi-electron excitation depends on the level of theory, i.e. how the electronic states are described. A general definition can be stated as follows: If there exists no one-electron operator that gives a matrix element unequal to zero between the reference state and an excited state, the latter must be multielectron in nature. The reference state is in most cases the ground state of the system. Some spectral features in XAFS are commonly denoted multi-electron spectral features and referred to as 'shake-up', ‘shake-down’ and 'shake-off' excitations. The amplitude reduction factor [math]S_0^2[/math] in the EXAFS equation is included to consider multielectron excitations.