New molecules in IRC +10216: confirmation of C5S and tentative identification of MgCCH, NCCP, and SiH3CN

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Table 1

Line parameters observed in IRC +10216.

Transition	ν _calc	ν _obs	V _exp
	(MHz)	(MHz)	(km s^-1)	(K km s^-1)

J′ − J′′	C₅S

44−43	81 192.98	81 193.4(10)^a	14.5^b	0.09(3)
45−44	83 038.05	83 037.8(4)	13.7(8)	0.05(1)
46−45	84 883.09	84 883.5(10)	16.3(20)	0.08(2)

	MgCCH

9_17/2−8_15/2	89 361.27	89 361.0(15)	14.5^b	0.03(1)
9_19/2−8_17/2	89 377.76	89 378.0(15)	14.5^b	0.03(1)
10_19/2−9_17/2	99 289.52	99 288.5(10)	14.5^b	0.04(1)
10_21/2−9_19/2	99 306.01	99 305.6(10)	14.5^b	0.07(2)

J′ − J′′	NCCP

15−14	81 131.69	81 131.9(10)	14.5^b	0.03(1)
16−15	86 540.07	86 539.5(10)	14.5^b	0.05(1)
18−17	97 356.60	97 355.7(10)	12.4(15)	0.06(2)

	SiH₃CN^c

9₀−8₀	89 509.90	89 509.5(10)	16.7(15)	0.05(1)
9₁−8₁	89 508.76
10₀−9₀	99 454.36	99 452.5(15)^a	14.7(15)	0.08(2)
10₁−9₁	99 453.08
11₀−10₀	109 398.46	109 397.0(15)^a	14.5^b	0.09(3)
11₁−10₁	109 397.06

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

^(a)

Line blended.

^(b)

Line width has been fixed.

^(c)

The strongest K components of SiH₃CN (K = 0,1) are fit to one single line.

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