Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dmp.d1006o&link_type=abstract
The 35th Meeting of the Division of Atomic, Molecular and Optical Physics, May 25-29, 2004, Tuscon, AZ. MEETING ID: DAMOP04, ab
Physics
Scientific paper
Emission spectra arising from He-like ions are a powerful probe of plasma conditions. They are especially valuable diagnostics of transient astrophysical and laboratory sources such as X-ray flares in accretion disks around black holes, magnetic Z-pinch devices, and inertial confinement fusion plasmas. New collisional and radiative data for a number of He-like ions have been calculated in the close coupling formulation using the Briet-Pauli R-Matrix (BPRM) method. Physical effects such as radiation damping of resonances in electron impact excitation have been studied in detail. These calculations include total unified recombination rates, subsuming both the radiative and the dielectronic recombination processes, and transition probabilities which are used to calculate recombination-cascade contributions to line intensities. We model transient systems by solving the ionization balance and collisional-radiative equations in a time dependent manner. The spectra show cases where the non-dipole lines are stronger than those for allowed transitions, such as the 'spectral inversion' of forbidden and resonance lines characteristic of recombination dominated plasmas. Results for N, O, Ne, and Fe will be presented.
Delahaye Franck
Nahar Sultana N.
Oelgoetz Justin
Pradhan Anil Kumar
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