C2H in prestellar cores | Astronomy & Astrophysics (A&A)

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Table 5:

Observed hyperfine structure components of the $N'\rightarrow N=2\rightarrow 1$ transition in ${\rm C_{2}H}$ : rest frequencies^a, residuals $\rm o-c$ between observed and calculated frequencies^b, and relative intensities f.
Comp.	Transition	$\nu$	$\rm o-c$	f
no.	$J',F'\rightarrow J,F$	[MHz]	[kHz]
1	$5/2,2\rightarrow3/2,2$	174634.861 (16)	6	0.017
2	$5/2,3\rightarrow3/2,2$	174663.199 (12)	0	0.350
3	$5/2,2\rightarrow3/2,1$	174667.629 (14)	-12	0.232
4	$3/2,2\rightarrow1/2,1$	174721.744 (14)	-8	0.197
5	$3/2,1\rightarrow1/2,0$	174728.071 (12)	12	0.083
6	$3/2,1\rightarrow1/2,1$	174733.210 (14)	-15	0.052
7	$3/2,2\rightarrow3/2,2$	174806.843 (14)	-7	0.045

^a Numbers in parentheses are one standard deviation in units of the least significant figures.
^b Calculated from present set of spectroscopic parameters in Table 6.

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