Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dmp.j1028d&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
Scientific paper
Relatively few investigations have been devoted to the study of X-ray emissions caused by collisions of highly charged ions (HCI) with insulator surfaces. Practical space applications include X-ray emissions from comets that interact with the solar wind; and recent discovery of olivine on Mars by the Spirit Rover. We will present target X-ray emission spectra that arise from positive charge build-up on insulating surfaces caused by the projectile HCIs. The HCI were Ne^q+, O^q+, N^q+, and C^q+ ions, at energies of (2-7)q keV. The targets were olivine, augite, and quartz. An electron flood gun was used to irradiate surface simultaneously with the HCIs. The effect of the flood gun was to reduce the positive charge-up of the insulator surface caused by the HCI beam; which also had the effect of reducing or stopping the X-ray emission. X-rays were only observed when the surface charge was present, indicating that X rays are produced by secondary electrons accelerated into the insulator. The primary function of the HCI beam is to cause surface charging. This work was carried out at JPL/Caltech through agreement with NASA
Chutjian Ara
Djuric Nada
Lozano Juan
Smith Steven J.
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