The tight correlation of CCH and c-C3H2 in diffuse and translucent clouds

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Table 2

Spectroscopic parameters for the observed species.

Molecule	Freq. [GHz^*	E_low [cm^-1]	Transition	A [s^-1]	I _rel	Ref.

CCH, (N_J,F)	87.284105	0.0015	1_3/2,1−0_1/2,1	2.59 × 10^-7	0.1	CDMS
	87.316898	0.0015	1_3/2,2−0_1/2,1	1.53 × 10^-6	1.0	CDMS
	87.328585	0.0000	1_3/2,1−0_1/2,0	1.27 × 10^-6	0.5	CDMS
	87.401989	0.0015	1_1/2,1−0_1/2,1	1.27 × 10^-6	0.5	CDMS
	87.407165	0.0015	1_1/2,0−0_1/2,1	1.53 × 10^-6	0.2	CDMS
	87.446470	0.0000	1_1/2,1−0_1/2,0	2.61 × 10^-7	0.1	CDMS
c-C₃H₂, (J_{K_a,K_c})	85.338893	1.6332	2_1,2−1_0,1	2.55 × 10^-5		JPL
HCS⁺, (J)	85.347890	1.4235	2−1	1.11 × 10^-5		CDMS

Notes.

^(*)

CCH frequencies derived from Padovani et al. (2009); JPL refers to the JPL spectral line catalog (Pickett et al. 1998); CDMS refers to the Cologne Data Base for Molecular Spectroscopy (Müller et al. 2001, 2005).

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