Rotational lines of13C14N have been identified in high-resolution (λ/△λ ∼ 60,000) echelle spectra of the CN B2Σ+ - X2Σ+ (0-0) band in three comets. The12C/13C abundance ratios determined using a full fluorescence excitation model for comets Levy (
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Wyckoff et al. (2000) studied this question.
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