Physics – Atomic Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.4102c&link_type=abstract
American Astronomical Society, AAS Meeting #212, #41.02; Bulletin of the American Astronomical Society, Vol. 40, p.241
Physics
Atomic Physics
Scientific paper
A variety of atomic physics processes are encountered in single-collision, high electron temperature plasmas. These include collisional excitation of highly-charged ions (HCIs) in ground and metastable states; direct and indirect electron ionization; radiative and dielectronic electron-HCI recombination; single and multiple charge-exchanges between a neutral target and an HCI; and X-ray emission from HCIs. In addition, the presence of a strong local electric or magnetic field can induce level mixing, and hence modify the underlying collision physics and cross sections. Plasmas include fusion devices, solar and stellar objects, and planetary upper atmospheres and comets as they interact with HCIs present in solar and stellar winds. Recent JPL laboratory results will be given in the measurement of absolute collisional excitation cross sections in ground-state HCIs, absolute single and multiple charge exchange cross sections, X-ray emission spectra, and (for the case of coronal equilibrium calculations) lifetimes of metastable states in HCIs. Spectroscopic and imaging data from the NASA and ESA space telescopes have been astounding. Present and future missions include Chandra, Hinode, Newton, SOHO, SDO, STEREO, and TRACE. The utility of laboratory data combined with results of accurate theoretical calculations will be illustrated by measurements of the Fe13+ coronal green-line excitation cross section, and resolution of the so-called "Iron Conundrum” when comparing ion densities in Seyfert Galaxies and our Sun.
Collaborations with Clark Atlanta Univ. (S. Tayal), Harvard Ctr. for Astrophysics (J. Raymond), Pomona College (R. Mawhorter), Sheffield Hallam Univ. (K. Berrington). and the Univ. Connecticut (Q. Kessel, W. Smith) are gratefully acknowledged. This work was carried out at JPL/Caltech, and was supported through agreement between Caltech and NASA.
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