Atomic photoionization in a changing plasma environment

Atomic photoionization in changing plasma environment

We present a detailed theoretical study on the photoionization of oneand twoelectron atoms subject to external changing plasma environment based on the DebyeHückel model. Specifically, by examining the migration of the bound excited states into the continuum in the presence of plasma, our investigation has led to resonance-like photoionization structures immediately above the ionization thresho...

A MODEL STUDY OF LASER ISOTOPE SEPARATION BY PHOTOIONIZATION OR PHOTODISSOCIATION PROCESS

In this study, the selective photoexication of isotopic mixtures by laser light is investigated. Atomic and molecular methods are examined and rate equations are derived for both cases. Two and three step photoionization techniques are considered and rate equations are solved for ion yields. The molecular photodissociation process is also studied and the dependence of the dissociation produ...

Multiplet-changing Auger transitions in valence double photoionization.

Electron-ion Recombination Rate Coefficients, Photoionization Cross Sections, and Ionization Fractions for Astrophysically Abundant Elements. Ii. Oxygen Ions

A comprehensive and self-consistent set of new atomic data for photoionization cross sections, and pPI, total uniÐed recombination rate coefficients, of oxygen ions are obtained. The calculations are a R (T ), carried out in the close coupling approximation employing the R-matrix method. The uniÐed treatment of total recombination includes both the radiative and dielectronic processes. The anal...

Study of laser ablation using nano-second laser pulses

 In this paper, the laser ablation process based on the irradiation of nanosecond pulsed lasers on a copper target surface in the presence of Helium gas is studied. The dynamical behaviors of the generated plasma in the helium gas and evaporated copper at the atmospheric pressure are examined using a laser pulse, laser wavelength of and intensity of 7×1010W/cm2. A one-dimensional thermal model ...