Nuclear spin temperatures of water, ammonia and methane in comet C/2001 Q4 (NEAT)

Details Nuclear spin temperatures of water, ammonia and methane in comet C/2001 Q4 (NEAT) Nuclear spin temperatures of water, ammonia and methane in comet C/2001 Q4 (NEAT)

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.1611k&link_type=abstract

American Astronomical Society, DPS meeting #37, #16.11; Bulletin of the American Astronomical Society, Vol. 37, p.647

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Scientific paper

The real meaning of cold nuclear spin temperatures found in cometary molecules is still puzzling. Usually the nuclear spin temperature has been considered to be the physical temperature where the molecules formed (or condensed) on cold grains in thermal equilibrium. If so, the nuclear spin temperatures of different molecular species should be the same. Here we report the nuclear spin temperatures of water, ammonia and methane in comet C/2001 Q4 (NEAT) and discuss the existence of such thermal equilibrium process. Those nuclear spin temperatures are consistent with one another, indicating ˜ 30 K. Our results support the hypothesis that the nuclear spin temperature was determined in thermal equilibrium, namely, the nuclear spin temperature can be used to infer the physical temperature.

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