Statistics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22f01w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH22F-01
Statistics
2144 Interstellar Gas, 2151 Neutral Particles, 2194 Instruments And Techniques
Scientific paper
We have tested three different conversion surfaces (CVD diamond, barium zirconate and magnesium oxide) for an interstellar neutral gas instrument in a prototype sensor. A neutral oxygen beam in the energy range 30 - 300 eV was used. This energy range is typical for the interstellar gas flow as seen from a spacecraft in the inner heliosphere. The prototype sensor performs energy and time-of-flight analysis of the negative ions generated on the conversion surface and thus provides unambiguous mass determination. This combination allows the distinction between intrinsic background, sputtered ions and truly converted primary neutrals. For all three surfaces a substantial conversion efficieny was observed that extended to the lowest energies under investigation. The overall detection efficiencies are sufficient to collect typical interstellar O distributions with meaningful statistics within reasonable integration times (one to a few days).
Bochsler Peter
Fuselier Stephen A.
Ghielmetti A.
Moebius Eberhard
Quinn John J.
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