Topics in astrophysical X-ray and gamma ray spectroscopy

Details Topics in astrophysical X-ray and gamma ray spectroscopy Topics in astrophysical X-ray and gamma ray spectroscopy

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........8b&link_type=abstract

Ph.D. Thesis - Maryland Univ. National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.

Astronomy and Astrophysics

Astrophysics

2

Astrophysics, Gamma Ray Astronomy, X Ray Spectroscopy, Astronomical Spectroscopy, Cyclotron Radiation, Gamma Rays, Line Spectra, Magnetic Fields, Positron Annihilation, X Rays

Scientific paper

A number of topics relating to astrophysical observations that have already been made or are currently planned of spectral features, mostly emission lines, in the X-ray and gamma ray region of the electromagnetic spectrum are investigated. These topics include: the production of characteristic X-ray and gamma ray lines by nonthermal ions, spectral features induced by processes occurring in strong magnetic fields, and the positron annihilation line at 0.5 MeV. The rate of X-ray production at 6.8 keV by the 2p to 1s transition in fast hydrogen- and helium-like iron ions, following both electron capture to excited levels and collisional excitation is calculated. The cross section for electron-ion Coulomb collisions in strong fields is also calculated.

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