Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

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Table 3.

Deuteration enhancement in TMC-1 for selected molecules compared to our gas-phase chemical model.

		Model ^(a)	Model ^(a)	Model ^(a)
Molecule	TMC-1	N/O = 0.5	N/O = 1	N/O = 1.5
H₂CCN/HDCCN	20 ^(b)	17.6	16.2	15.2
HC₃N/DC₃N ^(c)	62	78.8	75.3	73.0
HNCCC/DNCCC ^(c)	43	34.8	35.9	37.2
HCCNC/DCCNC ^(c)	30	71.7	68.3	65.9
HCNCC/DCNCC ^(d)		21.2	20.9	20.6
HC₅N/DC₅N ^(c)	82	27.8	28.3	29.4
CH₃CCH/CH₃CCD	49	204.6	210.	213.3
CH₃CCH/CH₂DCCH	10 ^(e)	68.2	70.1	71.1
CH₃CN/CH₂DCN	11 ^(e)	10.2	9.9	9.7
c-C₃H₂/c-C₃HD	27 ^(b)	45.5	45.1	45.1
H₂C₄/HDC₄	83 ^(b)	114.4	113.6	114.4
C₄H/C₄D	118	104.3	107.1	109.5

Notes.

^(a)

See text for the assumed physical conditions. [O/H] = 8 × 10⁻⁶, D/H = 1.5 × 10⁻⁵, and C/O = 0.75.

^(b)

The elemental H/D abundance ratio is affected by the presence of two identical nuclei of H.

^(c)

These H/D abundance ratios are from Cernicharo et al. (2020c).

^(d)

This isomer of HC₃N has not yet been detected in space.

^(e)

The elemental H/D abundance ratio is affected by the presence of three identical nuclei of H.

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