HR: 09:40h
AN: P41A-05 INVITED     [Abstracts]
TI: Atomic Physics of X-Ray Emissions
AU: * Dalgarno, A
EM: adalgarno@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 United States
AB: Atomic Physics is an essential element in the interpretation of observations of X-rays,in the identification of the mechanisms that produce X-rays and in the prediction of the spectra. The spectra serve as powerful diagnostics of the origin of the X-rays and the nature of the astrophysical environments in which the sources are embedded. Atomic processes that lead to the emission of X-rays will be discussed with particular attention to charge transfer in collisions of highly-stripped ions with neutral material. Following electron capture radiative cascade occurs involving many transitions in which X-rays and extreme ultraviolet radiation are emitted. The charge transfer cross sections depend on velocity, on the charge state of the ions and on the target, and the transition rates depend on the atomic system formed by elcetron capture. These data can be used to separate out the different contributions to the soft X-ray background.
DE: 7554 X rays, gamma rays, and neutrinos
SC: Planetary Sciences [P]
MN: 2005 Joint Assembly