Collisional-radiative ionization from excited states of H-like ions and relaxation of excited-state populations

Details Collisional-radiative ionization from excited states of H-like ions and relaxation of excited-state populations Collisional-radiative ionization from excited states of H-like ions and relaxation of excited-state populations

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jqsrt..49...39r&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 49, no. 1, p. 39-51.

Computer Science

Electron States, Gas Ionization, Hydrogen Ions, Ionic Collisions, Plasma Density, Radiative Transfer, Green'S Functions, Monte Carlo Method, Rydberg Series

Scientific paper

The study presents a numerical investigation of the dynamics and efficiency of collisional-radiative ionization for levels with p = 2-40 of H-like ions for different plasma densities and temperatures. Different approaches (the Runge-Kutta method, Gear's algorithm, and the Monte Carlo technique) to calculate the transient Green function for the level populations are compared. For dense plasmas, it is shown that stepwise ionization from Rydberg levels has to be taken into account down to Te of about 2Z-squared Ry/p-cubed, at which direct ionization from the p level is suppressed. Under these conditions, the evolution of fractional level populations for the bulk of the distribution acquires features of a solitary solution propagating downwards over the levels. It is shown that the time to establish a population-density perturbation of level p after the onset of a selective pump may exceed the level lifetime by an order of magnitude.

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