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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

4443 81 192.98 81 193.4(10)a 14.5b 0.09(3)
4544 83 038.05 83 037.8(4) 13.7(8) 0.05(1)
4645 84 883.09 84 883.5(10) 16.3(20) 0.08(2)

MgCCH

917/2815/2 89 361.27 89 361.0(15) 14.5b 0.03(1)
919/2817/2 89 377.76 89 378.0(15) 14.5b 0.03(1)
1019/2917/2 99 289.52 99 288.5(10) 14.5b 0.04(1)
1021/2919/2 99 306.01 99 305.6(10) 14.5b 0.07(2)

J′ − J′′ NCCP

1514 81 131.69 81 131.9(10) 14.5b 0.03(1)
1615 86 540.07 86 539.5(10) 14.5b 0.05(1)
1817 97 356.60 97 355.7(10) 12.4(15) 0.06(2)

SiH3CNc

9080 89 509.90 89 509.5(10) 16.7(15) 0.05(1)
9181 89 508.76
10090 99 454.36 99 452.5(15)a 14.7(15) 0.08(2)
10191 99 453.08
110100 109 398.46 109 397.0(15)a 14.5b 0.09(3)
111101 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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