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Source of Nitrogen Isotope anomaly in HCN in the Atmosphere of Titan

Liang, Mao-Chang; Heays, Alan; Lewis, Brenton; Gibson, Stephen; Yung, Yuk L


The 14N/ 15N ratio for N 2 in the atmosphere of Titan was recently measured to be a factor of 2 higher than the corresponding ratio for HCN. Using a one-dimensional photochemical model with transport, we incorporate new isotopic photoabsorption and photodissociation cross sections of N 2, computed quantum-mechanically, and show that the difference in the ratio of 14N/ 15N between N 2 and HCN can be explained primarily by the photolytic fractionation of 14N 14N and 14N 15N. The [HC 14N]/[HC 15N]...[Show more]

CollectionsANU Research Publications
Date published: 2007
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1086/520881


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