Auger effect resonant

In addition, the observed width of an Auger line is also affected by the spectrometer resolution. However, the bandpass of the incident radiation which produces the initial state for the Auger decay does not play a role, unlike in the case of the width of an observed photoline. (This statement only holds for the two-step model of inner-shell ionization and subsequent Auger decay. In the vicinity of the inner-shell ionization threshold it significantly fails due to postcollision interaction (Section 5.5) and the resonant Raman Auger effect (Section 5.1.2.1).) Hence, Auger transitions often appear in the spectra of ejected electrons as lines much sharper than the corresponding photolines. 

The Auger effect is an important process in solid state spectroscopy. One can use resonant Auger spectra to study the nature of core excitation in ionic solids by examining the Auger structure, the nature of the core holes can be determined, as well as the splitting of the states by the ligand field. 

Inner-Shell Auger Effect. This is dominant for photon energies not far above the inner-shell thresholds. Singlet dication states are favored in ionization from closed shells. PCI effects are important at low photoelectron energies. Closely related, but relatively unstudied as yet by modern methods, is the resonant double Auger effect, where a nearedge neutral state is initially populated. 

It is likely that the answers to these questions will come only from more selective and sophisticated experiments than have been done hitherto, although some useful directions have been established. The use of high-sensitivity electron spin resonance for the study in situ of anticipated radical species will likely be possible, if the background signals from other radiation-produced species are not too intense. Studies of the chemistry of implanted atoms and ions in solid organometallic substrates will make it possible to start with totally unbound atoms which suffer no Auger ionization and thus to simulate the extreme of the total recoil. Careful studies of the thermal annealing effects, especially in the presence of reactive atmospheres, will... 

So far, we have discussed only the detection of y-rays transmitted through the Mossbauer absorber. However, the Mossbauer effect can also be established by recording scattered radiation that is emitted by the absorber nuclei upon de-excitation after resonant y-absorption. The decay of the excited nuclear state proceeds for Fe predominantly by internal conversion and emission of a conversion electron from the K-shell ( 90%). This event is followed by the emission of an additional (mostly Ka) X-ray or an Auger electron when the vacancy in the K shell is filled again. Alternatively, the direct transition of the resonantly excited nucleus causes re-emission of a y-photon (14.4 keV). 

If the work function is smaller than the ionization potential of metastable state (see. Fig. 5.18b), then the process of resonance ionization becomes impossible and the major way of de-excitation is a direct Auger-deactivation process similar to the Penning Effect ionization a valence electron of metal moves to an unoccupied orbital of the atom ground state, and the excited electron from a higher orbital of the atom is ejected into the gaseous phase. The energy spectrum of secondary electrons is characterized by a marked maximum corresponding to the... 

Auger Resonant Raman Processes Effects of the Partial Density of Unoccupied Electronic States on Resonant KLL Auger Spectra in... 

AUGER RESONANT RAMAN PROCESSES EFFECTS OF THE PARTIAL DENSITY OF UNOCCUPIED ELECTRONIC STATES ON RESONANT KLL AUGER SPECTRA IN Cu AND Ni METALS... 

Figure 10. Theta trajectories for the Be+ (Is-1) Auger pole from the zeroth (bi-variational SCF), second order ( 3), quasiparticle second order (Ej), diagonal Sph-TDA ( 3pA TIM) and quasiparticle diagonal Sph-TDA (E3ph TDA) decouplings of the dilated electron propagator. The disparity between the theta trajectories for the SCF and propagator poles makes apparent the magnitude of correlation and relaxation effects attending the Auger resonance formation.

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