Deuterium fractionation and the degree of ionisation in massive clumps within infrared dark clouds

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Volume 534 (October 2011)

A&A, 534 (2011) A134

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Table 3

Other candidate species/transitions observed.

Species/	ν	E_u/k_B
transition^a	[MHz]	[K]

ortho-c-C₃H₂(J_{K_a,K_c} = 3_3,0 − 2_2,1) v = 0	216 278.7560 (JPL)	19.5
C₂D(N_J,F = 3_7/2,9/2 − 2_5/2,7/2)^b	216 372.8300 (CDMS)	20.8
CH₂CHC¹⁵N(J_{K_a,K_c} = 25_2,24 − 25_0,25)^c	216 428.6683 (JPL)	151.8
U	216 452.5110	...
CNCHO(J_{K_a,K_c} = 23_0,23 − 22_0,22)^d	219 531.6000 (CDMS)	127.2
C¹⁸O(J = 2−1)^d	219 560.3600 (JPL)	15.8
CH₃NH₂-E(J_{K_a,K_c} = 7_2,5 − 7_1,5)^e	231 060.6041 (JPL)	75.6
OCS(J = 19 − 18)	231 060.9830 (JPL)	110.9
CH₃COCH₃-EA(J_{K_a,K_c} = 15_9,7 − 14_8,6) v = 0	231 080.9647 (JPL)	95.9
¹³CS(J = 5−4)	231 220.9960 (JPL)	33.3
SiO(J = 6−5)	260 518.0200 (JPL)	43.8

Notes.

^(a)

For asymmetric top molecules, K_a and K_c refer to the projection of the angular momentum along the a and c principal axes. The CH₂CHC¹⁵N and CNCHO transitions are of type a (ΔK_a = 0, ± 2,... and ΔK_c = ± 1, ± 3,...), the o-c-C₃H₂ and CH₃COCH₃-EA transitions are b-type (ΔK_a = ΔK_c = ± 1, ± 3,...), and the CH₃NH₂-E transition exbits c-type selection rules (ΔK_a = ± 1, ± 3,... and ΔK_c = 0, ± 2,...) (Gordy & Cook 1984).

^(b)

This is the strongest hf component and it is blended with the J,F = 7/2,5/2 − 5/2,3/2 and J,F = 7/2,7/2 − 5/2,5/2 hf components.

^(c)

Blended with the C₂D(3−2) hf group.

^(d)

Seen in the image band. The candidate lines of CNCHO, CH₃NH₂-E, OCS, and CH₃COCH₃-EA are possibly blended with C¹⁸O(2−1) coming from the image band.

^(e)

The corresponding vibrational level is E₁, l = −1. This line is blended with OCS(19 − 18).

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