Studying the Optical Properties of the NPD Mirrors

Details Studying the Optical Properties of the NPD Mirrors Studying the Optical Properties of the NPD Mirrors

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..marl28006m&link_type=abstract

American Physical Society, Annual APS March Meeting, March 18 - 22, 2002 Indiana Convention Center; Indianapolis, Indiana Meetin

Physics

Scientific paper

In photographs taken from recent space missions, evidence has been found that water was once present on Mars surface. To explain the absence of the water today, several hypotheses have been developed. One of these hypotheses speculates that because Mars lacks a magnetic field, its atmosphere has been depleted by its interaction with the solar wind. In 2003, the European Space Agency plans to send a spacecraft to Mars in order to test this hypothesis. One of the several instruments on the ESA spacecraft, the Energetic Neutral Particle Analyzer contains a time-of-flight neutral particle detector (NPD). This NPD will measure the momentum of neutral particles in the solar wind that might bombard Mars atmospheric particles. The XUV research group at BYU developed a design and the start surfaces were fabricated and delivered in the summer of 2001. Yet the optical properties of these surfaces were not entirely understood because of the time constraints put on the project. Using XUV reflectometry, ellipsometry, x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) we analyzed the effects of hydration, optical constants, and roughness of the NPD mirrors.

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