Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dmp.k1032s&link_type=abstract
American Physical Society, 38th Annual Meeting of the Division of Atomic, Molecular, and Optical Physics, June 5-9, 2007, abstra
Physics
Scientific paper
Laboratory measurements to benchmark space observations of x rays from comets approaching the sun were made using the highly- charged ion-beam facility at JPL and the UConn 1 m grazing- incidence CCD spectrometer. Beam-gas spectra are obtained from ions found in the solar wind on CO and other cometary gases. We compare our latest measurements of line emission in the range 2- 70 nm ( 17-600 eV) for N^5,6+, near the fast solar wind velocity ( 700 km/s), with previous measurements involving the isoelectronic ions O^6,7+. The highest n states excited on the projectiles by single electron charge transfer agree approximately with the Coulomb over-the-barrier model (e.g. for N^6+ on CO, primary excitation is mainly to n=4 and some to n=5 levels). The final l-dependences are also under study.
Chutjian Ara
Gohn Wesley
Kessel Quentin
Miller Kenneth
Smith Steven J.
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