Table 1: Line parameters of CH2CHCN, CH2CN, CH3CCH, and H2CS in IRC +10216.
  Observed Calculated   Line  
Transition Symmetry Frequency Frequency $v_{\rm exp}$a Strength $E_{\rm up}$ $\int T_{\rm A}^*$dv $\eta_{\rm b}$b
  (MHz) (MHz) (km s-1)   (K) (K km s-1)  
CH2CHCN
90,9-80,8   84 946.7(3) 84 946.000 15.5(10) 9.00 20.4 0.11(2) 0.82
91,9-81,8   83 207.5(8) 83 207.505 14.8(10) 8.89 22.1 0.14(2) 0.82
92,7-82,6   85 715.4(5) 85 715.424 14.5d 8.56 29.2 0.09(3)c 0.82
93,7-83,6   85 427.9(10) 85 426.920 14.5d 8.00 40.0 0.09(3)c 0.82
93,6-83,5   85 435.6(10) 85 434.526 14.5d 8.00 40.0 0.07(2)c 0.82
100,10-90,9   94 276.3(10) 94 276.634 14.5d 9.99 25.0 0.15(3) 0.81
101,10-91,9   92 426.1(15) 92 426.248 14.5d 9.90 26.6 0.11(3) 0.81
102,9-92,8   94 760.9(7) 94 760.781 14.5d 9.60 33.7 0.07(2) 0.81
102,8-92,7   95 325.1(8) 95 325.474 14.5d 9.60 33.8 0.14(3) 0.81
103,8-93,7   94 926.2(15) 94 928.606 14.5d 9.10 44.5 0.09(3) 0.81
103,7-93,6   94 942.0(10) 94 941.630 14.5d 9.10 44.5 0.08(2) 0.81
104,7-94,6   94 913.4(10) 94 913.115 14.5d 8.40 59.7 0.11(3)c 0.81
104,6-94,5     94 913.226   8.40 59.7 c 0.81
111,11-101,10   101 637.1(8) 101 637.231 14.5d 10.9 31.5 0.07(3) 0.80
112,10-102,9   104 211.5(10) 104 212.646 14.5d 10.6 38.7 0.08(3) 0.79
CH2CN
40,4-30,3 J=9/2-7/2 O 80 480.5(10) 80 480.384 14.5d 4.44 9.7 0.23(6)c 0.82
40,4-30,3 J=7/2-5/2 O 80 489.6(10) 80 490.261 14.5d 3.43 9.7 0.25(6)c 0.82
50,5-40,4 J=11/2-9/2 O 100 600.2(15) 100 598.383 14.5d 5.46 14.5 0.40(7)c 0.80
50,5-40,4 J=9/2-7/2 O 100 609.6(15) 100 608.832 14.5d 4.44 14.5 0.33(6)c 0.80
52,4-42,3 J=11/2-9/2 O 100 633.2(15) 100 632.957 14.5d 4.58 67.2 0.10(3)c 0.80
52,3-42,2 J=9/2-7/2 O 100 542.5(10) 100 543.214 14.5d 3.73 67.2 0.12(3) 0.80
41,3-31,2 J=7/2-5/2 P 81 207.6(10) 81 206.601 14.5d 3.22 8.9 0.09(3)c 0.82
41,3-31,2 J=9/2-7/2 P 81 232.4(5) 81 232.654 14.8(5) 4.17 8.9 0.09(2) 0.82
51,5-41,4 J=11/2-9/2 P 99 689.5(8) 99 689.833 14.5d 5.23 13.4 0.14(4) 0.80
51,4-41,3 J=11/2-9/2 P 101 531.6(10) 101 532.055 14.5d 5.23 13.7 0.22(6) 0.80
71,7-61,6 J=13/2-11/2 P 139 547.1(15) 139 545.477 14.5d 6.33 25.9 0.14(4) 0.75
71,7-61,6 J=15/2-13/2 P 139 553.4(10) 139 552.138 14.5d 7.30 25.9 0.12(4) 0.75
CH3CCH
JK =50-40   85 456.4(10) 85 457.299 14.5d 5.00 11.5 0.12(4)c 0.82
JK=51-41     85 455.665   4.80 20.3 c 0.82
JK=60-50   102 547.5(6) 102 547.983 14.8(6) 6.00 17.2 0.22(5)c 0.80
JK=61-51     102 546.023   5.83 24.4 c 0.80
H2CS
31,3-21,2 O 101 478.1(10) 101 477.750 14.5d 2.67 8.1 0.18(4)c 0.80
31,2-21,1 O 104 617.5(10) 104 616.969 14.5d 2.67 8.4 0.23(3) 0.79
41,3-31,2 O 139 483.8(5) 139 483.422 14.1(6) 3.75 15.1 0.36(5) 0.75
30,3-20,2 P 103 040.3(5) 103 040.396 14.6(7) 3.00 9.9 0.13(2) 0.80
Note. The numbers in parentheses are errors in units of the last digits; the 1$\sigma $ error in $\int T_{\rm A}^*$dv is derived from least-squares fits and does not include the calibration uncertainty of 10%. a $v_{\rm exp}$ stands for expansion velocity and is computed as half the full linewidth at zero level. b $\eta_{\rm b}$ is $B_{\rm eff}$/ $F_{\rm eff}$, i.e. the ratio of $T_{\rm A}^*$to $T_{\rm mb}$. A superscript ``c'' denotes a partly blended line while ``d'' indicates that the linewidth parameter  $v_{\rm exp}$ has been fixed to 14.5 km s-1. The calculated frequencies of CH2CN correspond to the strongest hyperfine component, as measured by Ozeki et al. (2004). CH2CN and H2CS lines have ortho (O) or para (P) symmetry; $E_{\rm up}$ is the energy of the upper level of the transition above the O or P ground state.

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