Photoionization time-dependent

A.K. Kazansky, P. Selles, L. Malegat, Hyperspherical time-dependent method with semi-classical outgoing waves for double photoionization of helium, Phys. Rev. A 68 (2003) 052701. 

I would like to finish this section by a discussion of the time dependence of the relaxation process due to gCK fluctuation and decay. The photoionization process suddenly creates a HF-like 4p core hole and the time development of this hole is very different in the broadband and the narrow-band cases. As discussed in Sect. 3.5, the effect of the gCK fluctuation process is to introduce an angular correlation between dipolar deformations of the charge densities of the 4 p hole and the 4 d shell. The 4 p hole begins to create a tidal wave in the 4 d shell and the time rR that it takes to build up this deformed state is the relaxation time, given by... 

In this section we outline a theoretical framework enabling the 2 + 1 resonant photoionization of a hydrogenic atom to be analyzed. Generally, the process is assumed to be induced by a non-monochromatic laser field with a time-dependent amplitude and taking place in the presence of intermediate resonance. It is shown... 

In view of the great importance of chemical reactions in solution, it is not surprising that basic aspects (structure, energetics, and dynamics) of elementary solvation processes continue to motivate both experimental and theoretical investigations. Thus, there is growing interest in the dynamical participation of the solvent in the events following a sudden redistribution of the charges of a solute molecule. These phenomena control photoionization in both pure liquids and solutions, the solvation of electrons in polar liquids, the time-dependent fluorescence Stokes shift, and the contribution of the solvent polarization fluctuations to the rates of electron transfer in oxidation-reduction reactions in solution. 

This method has been successfully applied to the photoionization of Hg and Xe [103,101] as well as to the evaluation of the polarizabilities of heavy closed-shell atoms [104] (using a direct time-dependent extension of the LDA for the xc-functional). A concept to deal with excited states in the framework of RDFT has been put forward by Nagy [105]. The derivation and first applications of relativistic extended Thomas-Fermi models may be found in Refs.[106-112]. Furthermore, an RDFT approach to meson field theory for hadronic matter (quantum hadrodynamics) [113] has been established by Speicher et al. [114]. This hadronic RDFT has been successfully applied to the description of nuclear ground states both within the extended Thomas-Fermi model [115-118] and within the KS scheme [119-121]. A corresponding formalism for finite temperature is also available [122,123]. 

Abstract Recent advances achieved in the numerical resolution of the Time-Dependent Schrodinger Equation (TDSE), have made possible to address difficult problems in the analysis of highly nonlinear processes taking place when an atom is submitted to an ultra-intense laser pulse. We discuss the main properties of the photoelectron spectra obtained when a high frequency harmonic field is also present in addition to the laser field. This class of processes is believed to serve as a basis to explore new secnarios to achieve a coherent control of atomic photoionization. 

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