Velocity scales for Mars Mössbauer data

Details Velocity scales for Mars Mössbauer data Velocity scales for Mars Mössbauer data

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hyint.170...67a&link_type=abstract

Hyperfine Interactions, Volume 170, Issue 1-3, pp. 67-74

Computer Science

9

Scientific paper

Raw Mössbauer data acquired from surface rocks and soils by two Mars Exploration Rovers (MERs) are being made available on-line to the general science community for independent analysis and interpretation. The data are released as counts per channel, so a velocity scale must be defined. The Windows-based computer program MERView does this in two steps. In the first, a scale proportional to the true velocity is derived by adjusting the magnitudes of the drive error signal and a phase shift. This report focuses on the second step, in which mm/s units are assigned to the proportional scale by comparing laboratory-measured α-iron peak positions with those of spectra of the internal MER calibration targets. We contrast MERView-derived velocity scales for different MER measurement conditions with the velocity scales provided on-line by the MER team, and conclude that independent velocity calibration is generally desirable.

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