Discovery of two metallic cyanoacetylides in IRC +10216: HMgCCCN and NaCCCN

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Table 3.

Spectroscopic parameters of NaCCCN.

Parameter	Lab + IRC +10216 ^(a)	Laboratory ^(b)
B/MHz	1321.094464(27) ^(c)	1321.094334(28)
D/Hz	104.83(56)	101.1(7)
eQq(Na)/MHz	−7.0497 ^(d)	−7.0497(7)
eQq(N)/MHz	−3.8761 ^(d)	−3.8761(5)
rms ^(e) / kHz	15.9	0.9
N^(f)	129	122

Notes.

^(a)

Merged molecular parameters from a fit to the laboratory and IRC +10216 frequencies.

^(b)

Molecular parameters derived by Cabezas et al. (2019).

^(c)

Numbers in parentheses are 1σ uncertainties in units of the last digit.

^(d)

Fixed to the value determined from the laboratory data.

^(e)

Standard deviation of the fit.

^(f)

Number of transitions included in the fit.

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