Absolute Cross Section for Electron Impact Excitation of Metastable C2+

Details Absolute Cross Section for Electron Impact Excitation of Metastable C2+ Absolute Cross Section for Electron Impact Excitation of Metastable C2+

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dmp.p1103d&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

Carbon, Ions, Electron-Impact Excitation

Scientific paper

Progress toward measurements of the absolute cross section for electron impact excitation (EIE) of C^2+ (2s2p ^3P^o - 2p^2 ^3P) for energies below threshold to 15 eV above is reported. These measurements will be used to determine the EIE rate coefficients required for astrophysical applications. Ions are produced in a 5 GHz Electron Cyclotron Resonance (ECR) ion source. A modulated beams technique with inclined electron and ion beams is being used. The radiation from the excited ions at λ 117.5 nm is detected using an absolutely calibrated optical system that subtends slightly over π steradians. The population of the C^2+ metastable state in the incident ion beam is determined experimentally. This work is supported by NASA Supporting Research and Technology grants NAG5-9516 and NAG5-12863 in Solar and Heliospheric Physics and by the Smithsonian Astrophysical Observatory.

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