Electron collisional excitation of the fine structure levels of singly ionized atomic oxygen

Details Electron collisional excitation of the fine structure levels of singly ionized atomic oxygen Electron collisional excitation of the fine structure levels of singly ionized atomic oxygen

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dmp..lp42b&link_type=abstract

American Physical Society, DAMOP Meeting, 27-30 May 1998 Santa Fe, New Mexico, abstract #LP.42

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Historically forbidden transitions between all the ground configuration terms 1s^22s^22p^3 of OII (^4S^o_3/2, ^2D^o_5/2,3/2, ^2P^o_3/2,1/2) have been of great importance as a means of identifying and classifying their content in planetary nebulae. It is widely acknowledged that collisional excitation data on OII ions may be used as a diagnostic tool in laboratory and astrophysical plasmas, and for the theoretical modeling of supernova remnants (SNR) and OB type hot stars. Electron collisional excitation cross sections and rates are calculated, utilizing the ab initio R-matrix method within the Breit-Pauli approximation. We include twenty-one fine-structure target levels of the singly ionized atomic oxygen ion (OII) which are represented by multi-configuration interaction. Our work yields a wealth of information on forbidden and allowed collision strengths and rates between all these levels. A comparison of our effective collision strengths with the early five-state work of Pradhan for the fine structure collision strengths between all the forbidden transitions of the ground configurations terms 1s^22s^22p^3 (^4S^o_3/2,^2D^o_5/2,3/2,^2P^o_3/2,1/2), indicates improved results. Our results will have wide ranging applications for temperature diagnostics in laboratory and astrophysical plasmas and a comprehensive set of results will be presented at the meeting.

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