Discovery of a new molecular ion, HC7NH+, in TMC-1

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Table 2.

Theoretical spectroscopic parameters for the different molecular candidates for the observed lines in TMC-1 (all in MHz).

	HC₇NH⁺			HC₇N		NC₆NH⁺	HC₇O⁺		C₇O
Parameter	TMC-1 ^(a)	Calc. ^(b)	Scaled ^(c)	Exp. ^(d)	Calc. ^(b)	Calc. ^(b)	Calc. ^(b)	Scaled ^(e)	Exp. ^(f)	Calc. ^(b)
B_e		552.61			562.93	547.99	551.80			571.95
Vib-rot. corr.		0.97			0.60	0.72	0.69			0.80
B₀	553.939070 (140) ^(g)	553.58	554.05	564.0011225 (44)	563.53	548.71	552.49	552.67	572.94105 (5)	572.75
D × 10⁻⁶	3.7602 (619)	3.15	3.64	4.04108 (54)	3.50	3.22	3.12	4.46	4.75 (15)	3.32

μ (D)		6.4				12.4	1.7

Notes.

^(a)

Parameters derived using the TMC-1 from Table 1.

^(b)

This work; see text.

^(c)

This work; scaled by the ratio Exp/Calc. of the corresponding parameter for HC₇N species.

^(d)

Bizzocchi & Degli (2004).

^(e)

This work; scaled by the ratio Exp/Calc. of the corresponding parameter for C₇O species.

^(f)

Ogata et al. (1995).

^(g)

Values in parentheses denote 1σ errors, applied to the last digit.

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