Search

Single and double Auger processes following ionization of 4 f and 5p inner shells have been studied using multielectron coincidence spectroscopy. Coincidence technique enables us to resolve state by state all single and double Auger paths with a resolution better than the lifetime broadening. Drastic step-to-step decay lifetime changes are observed and reported as Coster-Kronig transition takes place either in the first (5p) or in the second (4f) step of the Auger cascade. Relativistic ab initio theory has been used to predict and interpret the experimental observations. [ABSTRACT FROM AUTHOR]

The 3p photoionization and subsequent Auger decay of initially neutral atomic germanium is studied both experimentally and theoretically. The binding energies and relative intensities of the 3p photoelectron spectrum are given. The M2,3 M3,4 M3,4 and M2,3 M3,4 N Auger electron spectrum leading to doubly ionized final states is presented. The photoelectron and Auger electron spectra were interpreted using multiconfiguration Dirac-Fock calculations that provided the identification for the main spectral features. [ABSTRACT FROM AUTHOR]

We have studied photoionization in the inner valence 3i subshell of and the spectroscopic properties of the two 3s-1 (¹S) and (³S) resulting states. Similar to the Rb and Cs cases, the lifetime widths of the (¹S) and (³S) states are found to be markedly different, due to the electron correlation effects. The main part of the study deals with the subsequent Auger decay of the 3s-1 states, which have the particularity to involve low energy (~5 eV) Auger electrons. A magnetic bottle spectrometer with a multicoincidence technique has been used to observe and filter the Auger spectra with respect to the K2+ final state. The evolution of these Auger spectra has been investigated near the ionization threshold. They show strong post-collision interaction (PCI) effects, which are well reproduced by semiclassical and eikonal models. They reveal the importance of the photoelectron-Auger-electron interaction associated with these low energy Auger electrons. [ABSTRACT FROM AUTHOR]

In this work, we consider the dissipative dynamics of a quantum Brownian magneto-oscillator in contact with different types of environment at zero temperature as well as at high temperatures. We derive closed-form expressions of decay rate and heating rate for the magneto-oscillator in contact with Ohmic, sub-Ohmic, and super-Ohmic environments with non-Markovian characteristics. The present study is useful in determining the relationship between the thermalization dynamics of a magneto-oscillator and different forms of environmental spectrum and external magnetic field. Although our study is limited to the short-time (Non-Markovian) and long-time (Markovian) regimes, it manifests that one can actually tune the effective coupling of the system reservoir either by tuning oscillator frequency through reservoir engineering techniques or changing external magnetic field. Thus the present work establishes the essential role of non-Markovian dissipation and the crucial role of magnetic field in the environment induced decoherence and decay processes of the dissipative magneto-oscillator. [ABSTRACT FROM AUTHOR]

The resonant-Auger decay in argon following Ar Is - np excitations was studied under resonant-Raman conditions, i.e., with a total instrumental bandwidth much narrower than the natural linewidth of the absorption features. These state-of-the-art experiments are combined with a radiationless resonant-Raman scattering theory. The main results include identification of the energy position of some high-lying Rydberg states previously masked by insufficient resolution and clear evidence of electronic-state-lifetime interference phenomena [ABSTRACT FROM AUTHOR]