Guelin and Thaddeus 1979

Guelin, M., and P. Thaddeus, 1979: Detection of HC¹⁸O⁺ in Sagittarius B2. Astrophys. J., 227, L139-L141, doi:10.1086/182885.

Line emission at 85.1 GHz attributed to the J = 1→0 rotational transition of the formyl ion HC¹⁸O⁺ has been detected in Sgr B2 (OH). The double isotopic ratio (¹⁶O/¹⁸O)/(¹²C/¹³C) in the formyl ion in Sgr B2 is estimated to be in the range 5-10, hence within a factor 2 of the terrestrial value of 5.5. This determination implies that the ¹³C/¹²C ratio near the galactic center does not differ greatly from that in local molecular clouds.

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Guelin, M., and Thaddeus, P.: Detection of HC¹⁸O⁺ in Sagittarius B2, Astrophys. J., 227, L139-L141, doi:10.1086/182885, 1979.

Guelin, M., and P. Thaddeus (1979), Detection of HC¹⁸O⁺ in Sagittarius B2, Astrophys. J., 227, L139-L141, doi:10.1086/182885.

Guelin, M., and P. Thaddeus, 1979: Detection of HC¹⁸O⁺ in Sagittarius B2. Astrophys. J., 227, L139-L141, doi:10.1086/182885.

Guelin, M., & Thaddeus, P. 1979, Astrophys. J., 227, L139, doi:10.1086/182885.

Guelin M, Thaddeus P. Detection of HC¹⁸O⁺ in Sagittarius B2, Astrophys J 1979;227:L139-L141. doi:10.1086/182885.

M. Guelin, P. Thaddeus, Astrophys. J. 227, L139-L141, doi:10.1086/182885 (1979).