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• W2038366954 abstract "We present spatially resolved measurements of the rotational temperature and ortho-para ratio for H2O in the inner coma of the Oort Cloud comet C/2004 Q2 (Machholz). Our results are based on direct simultaneous detections of ortho-H2O and para-H2O via hot-band fluorescence near 2.9 μm. We find a well-defined decline in rotational temperature with increasing nucleocentric distance (up to ~1000 km). The ortho-para ratio remains constant (within stochastic uncertainty) with increasing nucleocentric distance and is close to the statistical equilibrium value of 3.0 (2.86 ± 0.06 [0.17], including, respectively, stochastic [systematic] uncertainty), resulting in spin temperature Tspin ≥ 34 K. We compare the present results with those reported for other comets and discuss the difficulties in interpreting spin temperatures deduced from measured ortho-para ratios. Improved understanding of the special conditions that enable nuclear spin conversion would test the extent to which derived spin temperatures reflect the formative history or the processing record of cometary ices." @default.
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• W2038366954 date "2007-04-24" @default.
• W2038366954 modified "2023-10-17" @default.
• W2038366954 title "A Search for Variation in the H ₂ O Ortho-Para Ratio and Rotational Temperature in the Inner Coma of Comet C/2004 Q2 (Machholz)" @default.
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• W2038366954 doi "https://doi.org/10.1086/518419" @default.
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