Auger theory

Ion neutralization (or Ion survival) can dominate this technique. A number of theories have arisen to account for this phenomenon, but all seem to Include both Auger transitions and resonance tunneling processes as the dominant means of Ion neutralization.(4,5) For very slow Ions, as In LEISS, Auger... 

It has indeed been found (83a) that the work function of Ag-Pd alloy films equilibrated at 300°C only changes from 4.38 eV at pure silver to 4.50 eV at 86% Pd (increasing to 5.22 at pure Pd). It was proposed (83a) that this work function pattern is a consequence of surface enrichment by silver and so confirmation of the theory awaits further work function measurements on alloy surfaces for which compositions have been determined by, say, Auger electron spectroscopy. 

We conclude, therefore, that the momentum of the electron in its orbit within the atom does not affect the direction of ejection in the way demanded by the theory of Auger and Perrin. While this does not constitute definite evidence against the physical reality of electronic orbits, it is a serious difficulty for the conception. 

Nevertheless, the one-electron approach does have its deHciencies, and we believe that a major theoretical effort must now be devoted to improving on it. This is not only in order to obtain better quantitative results but, perhaps more importantly, to develop a framework which can encompass all types of charge-transfer processes, including Auger and quasi-resonant ones. To do so is likely to require the use of many-electron multi-configurational wavefunctions. There have been some attempts along these lines and we have indicated, in detail, how such a theory might be developed. The few many-electron calculations which have been made do differ qualitatively from the one-electron results for the same systems and, clearly, further calculations on other systems are required. 

Some relatively new analyses in the theory of nonradiative transitions have followed from the fact that there is no basic reason why our three primary processes cannot also take place in combination. Thus Gibb et al. (1977) propose a process of cascade capture into an excited electronic state and subsequent multiphonon emission from there. The results of this model were applied to capture and emission properties of the 0.75-eV trap in GaP. A more detailed analysis has since been given by Rees et al. (1980). Similarly, cascade capture followed by an Auger process with a free carrier seems a quite likely process. However, we are not aware that such a model has as yet been suggested. The third possible combination of processes, namely Auger with multiphonon, has been examined by Rebsch (1979) and by Chernysh... 

D. Chattarji, The Theory of Auger Transition. Academic Press, New York, 1976. 

The first theory of Auger effect was given by G. Wentzel (1927) in his seminal work on nonradiative quantum jumps [4], Wentzel used hydro-genic bound-state functions and the asymptotic forms of the free electron... 

APPLICATIONS OF FANO-ADC THEORY TO AUGER DECAY IN THE MULTIPLY IONIZED SYSTEMS... 

Let us describe several recent applications of the Fano-ADC theory to Auger decay in multiply ionized systems. We shall start with the simplest problem of this kind - effect of a single neighboring charge on the rate of atomic Auger decay. Then, we shall explore the effect of a spectator vacancy residing... 

H. Agren, A. Cesar, C.-M. liegener, Theory of molecular Auger spectra, Adv. Quant. Chem. 23 (1992) 1. 

O. Gunarsson, K. Schonhammer, Dynamical theory of Auger processes, Phys. Rev. B 22... 

T. Aberg, G. Howat, Theory of Auger effect, in W. Mehlhom (Ed.), Corpuscles and Radiation in Matter, Handbuch der Physik, Vol. 31, Springer, Berlin, 1982. 

V.G. Yarzhemsky, A. Sgamellotti, Auger rates of second-row atoms calculated by many-body perturbation theory, J. Elec. Spec. Rel. Phen. 125 (2002) 13. 

P. Ranitovic, X.M. Tong, C.W. Hogle, X. Zhou, Y. Liu, N. Toshima, M.M. Murnane, H.C. Kapteyn, Laser-enabled Auger decay in rare-gas atoms, Phys. Rev. Lett. 106 (2011) 053002 X.M. Tongl, P. Ranitovic, C.W. Hogle, M.M. Murnane, H.C. Kapteyn, N. Toshima, Theory and experiment on laser-enabled inner-valence Auger decay of rare-gas atoms, Phys. Rev A 84 (2011) 013405. 

AHo82] Aberg T and Howat G 1982 Theory of the Auger effect, in Corpuscles and radiation in matter, ed. W Mehlhom, Encyclopedia of Physics XXXI, ed. in chief S. Fliigge (Springer-Verlag, Berlin) p. 469. 

Meh78] Mehlhom W 1978 Electron Spectroscopy of Auger and autoionizing states Experiment and theory, Lectures held at the Institute of Physics, University of Aarhus, Denmark. 

---