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

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Table A.1.

Observed line parameters of HNCCC and HCCNC in TMC-1.

Molecule	J_u − J_l	ν_obs^(a)		Δv^(b)	^(c)	σ ^(d)
		(MHz)	(mK)	(kms⁻¹)	(mK kms⁻¹)	(mK)
HNCCC	4–3	37346.541(10)	118.7	0.70(1)	88.8(10)	0.6
HNCCC	5–4	46683.061(10)	121.2	0.57(1)	73.5(10)	1.5
DNCCC	4–3	35204.594(10)	2.4	0.76(9)	1.95(06)	0.5
DNCCC	5–4	44005.628(10)	3.2	0.46(9)	1.64(07)	1.1

HCCNC	4–3	39742.549(10)	249.2	0.62(1)	164.7(10)	0.8
HCCNC	5–4	49678.075(10)	224.6	0.58(1)	138.4(10)	1.9
DCCNC	4–3	36786.182(10)	6.1 ^(e)	0.58(9)	3.74(90)	0.7
DCCNC	5–4	45982.625(10)	9.9	0.60(8)	6.38(30)	1.1
H¹³CCNC	4–3	38504.813(10)	2.8	0.68(9)	2.03(30)	0.6
H¹³CCNC	5–4	48130.916(10)	4.5	0.45(9)	2.50(80)	1.7
HC¹³CNC	4–3	39595.406(10)	4.7	0.80(9)	3.97(30)	0.7
HC¹³CNC	5–4	49494.139(07)	≤4.5 ^(f)			1.5
HCCN¹³C	4–3	38438.864(10)	2.7	0.68(9)	1.92(40)	0.6
HCCN¹³C	5–4	48048.449(10)	5.4	0.45(9)	2.58(70)	1.8
HCC¹⁵NC	4–3	39557.751(50)	≤2.2 ^(f)			0.7

Notes.

^(a)

Observed frequencies for a v_LSR of 5.83 km s⁻¹. For all entries, values between parentheses represent the uncertainty in units of the last digit.

^(b)

Linewidth at half intensity derived by fitting a Gaussian line profile to the observed transitions (in kms⁻¹).

^(c)

Integrated line intensity in mK km s⁻¹.

^(d)

The sensitivity of the data (root mean square error) has been derived from a baseline to the each line in a velocity window −6.2 to 17.8 km s⁻¹ (in mK).

^(e)

Blended with a negative feature produced by the frequency switching observing mode.

^(f)

3σ upper limit. Observed frequency has been replaced by the predicted frequency.

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