Astronomical identification of CN-, the smallest observed molecular anion

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Table 1:

Observed line parameters of CN^-.
	$\nu_{\rm0}$ ^a	$\nu_{\rm obs}$	$v_{\rm exp}$ ^b	$\int$ $T_{\rm A}^*$ ${\rm d}$ v
Transition	(MHz)	(MHz)	(km s^-1)	(K km s^-1)
J = 1-0	112 264.8	112 264.8^c	14.5^c	$\sim$ 0.07(3)^d
J = 2-1	224 525.1	224 525.4(5)	14.5^c	0.23(7)^e
J = 3-2	336 776.4	336 777.0(12)	15.0(10)	0.13(2)

Notes. Number in parentheses are 1 $\sigma$ uncertainties in units of the last digits. ^(a) Frequencies derived from the rotational constants reported by Amano (2008). ^(b) $v_{\rm exp}$ is the half width at zero level. ^(c) Fixed value. ^(d) Highly uncertain estimate. Line severely blended with a strong C₆H line. ^(e) Line blended with a SiC₂ $\nu _3=2$ line.

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