The ALMA-PILS survey: complex nitriles towards IRAS 16293–2422

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Table 2.

Isotopic ratios in IRAS 16293A and B using methyl cyanide and its isotopologues.

Isotopic ratio	Source A	Source B
¹²C/¹³C^a	80 ± 19	67 ± 17
¹²C/¹³C^a	67 ± 14	80 ± 20
¹⁴N/¹⁵N	235 ± 33	250 ± 70
D/H(D1,D0)^b	1.5 ± 0.3%	1.2 ± 0.3%
D/H(D2,D0)^b	3.0 ± 0.3%	4.0 ± 0.5%

Notes.

^(a)

The ¹²C/¹³C ratio is derived from the ¹³CH₃CN/CH₃CN and CHCN/CH₃CN ratios, respectively.

^(b)

The D/H ratio was derived from the CH₂DCN/CH₃CN and CHD₂CN/CH₃CN ratios, respectively, taking into account the statistical correction. With D1 referring to the singly deuterated form, D2 referring to the doubly deuterated form, and D0 referring to the main species.

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