Anomalous Nitrogen Isotope Ratio in Comets

Details Anomalous Nitrogen Isotope Ratio in Comets Anomalous Nitrogen Isotope Ratio in Comets

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003sci...301.1522a&link_type=abstract

Science, Volume 301, Issue 5639, pp. 1522-1525 (2003).

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52

Scientific paper

High-resolution spectra of the CN B2 Σ+-X2 Σ+ (0,0) band at 390 nanometers yield isotopic ratios for comets C/1995 O1 (Hale-Bopp) and C/2000 WM1 (LINEAR) as follows: 165 +/- 40 and 115 +/- 20 for 12C/13C, 140 +/- 35 and 140 +/- 30 for 14N/15N. Our N isotopic measurements are lower than the terrestrial 14N/15N = 272 and the ratio for Hale-Bopp from measurements of HCN, the presumed parent species of CN. This isotopic anomaly suggests the existence of other parent(s) of CN, with an even lower N isotopic ratio. Organic compounds like those found in interplanetary dust particles are good candidates.

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