The Cassini Hydrogen Deuterium Absorption Cell: A Remote Sensing Instrument for Atomic D/H Measurements at Titan

Details The Cassini Hydrogen Deuterium Absorption Cell: A Remote Sensing Instrument for Atomic D/H Measurements at Titan The Cassini Hydrogen Deuterium Absorption Cell: A Remote Sensing Instrument for Atomic D/H Measurements at Titan

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2016m&link_type=abstract

American Astronomical Society, DPS meeting #28, #20.16; Bulletin of the American Astronomical Society, Vol. 28, p.1132

Astronomy and Astrophysics

Astronomy

Scientific paper

One of the remote sensing instruments aboard the NASA Cassini orbiter to Saturn is a German-built Hydrogen Deuterium Absorption Cell (HDAC). The use of the HDAC on a deep space probe represents a new application of this remote sensing device, and it will obtain the first measurements of atomic D/H on Titan. The HDAC measures the relative abundance of atomic hydrogen and deuterium by selectively absorbing H and D Lyman-alpha emission lines. This absorption is done by varying the HDAC cell optical depths at line center from tau = 0 - 13, which define a set of high resolution filters with 0.002 - 0.003 nm FWHMs. The Cassini spacecraft motion produces Doppler shifts which scan these filters 0 - 0.002 nm around Lyman-alpha line center. A description of the Cassini HDAC and the principles of absorption cell spectroscopy are presented, along with a discussion of the techniques which will be used to measure D/H at Titan. Results of observation models show that the Cassini HDAC is capable of measuring the ratio of deuterium Lyman-alpha signal to hydrogen Lyman-alpha signal on Titan to 10%. * now at Lunar and Planetary Laboratory, U. Arizona

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