Physics – Plasma Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt........17w&link_type=abstract
Proquest Dissertations And Theses 2007. Section 0506, Part 0606 59 pages; [M.S. dissertation].United States -- Nevada: Universi
Physics
Plasma Physics
Scientific paper
The measurement of charge transfer rate coefficients between multiply charged ions and neutral atoms and molecules is important in the areas of plasma physics and astro-physics. Such a measurement is also essential in verifying various theoretical electron capture processes. N 2+ is of particular interest since it is abundant in astrophysical nebulas and interstellar molecular clouds. The charge transfer rate coefficient for the charge exchange reaction between N 2+ [2 s 2 2 p ( 2 P 0 )] and N 2 is measured using ion trap techniques. N 2+ ions are produced by electron impact ionization of N 2 and stored inside a cylindrical rf trap. The charge transfer rate coefficient is determined by measuring the decay rate of stored N 2+ ions in the ion trap. The measured charge transfer rate coefficient between N 2+ and N 2 is 1.95 ± 0.27 × 10^-9 cm 3 s -1 at T equiv = 9.1 × 10^3 K. The estimated uncertainty of ± 14% is mainly due to the statistical fluctuations of the ion signal and the N 2 particle density measurements. The charge transfer rate coefficient is within one standard deviation of previously published results.
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