Discovery of HC4NC in TMC-1: A study of the isomers of HC3N, HC5N, and HC7N

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Table A.3.

New rotational and distortion constants for some isotopologues of HNCCC and HCCNC and for HC₄NC.

Molecule	B₀^(a)	D₀	J_max	σ^(b)
	(MHz)	(kHz)		(kHz)
DNCCC	4400.5944(4)	0.63(9)	5	1.7
H¹³CCNC	4813.1187(6)	0.54(4)	5	2.5
HC¹³CNC	4949.4462(3)	0.64(4)	4	1.0
HCCN¹³C	4804.8737(5)	0.56(3)	5	13.8
HCCCCNC ^(c)	1401.18216(6)	0.0328(4)	16	7.0

Notes.

^(a)

Values between parentheses represent the uncertainty in units of the last digit.

^(b)

Standard deviation of the fit.

^(c)

The fitted value for eQq is 0.97(3) MHz.

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