A new radio molecular line survey of planetary nebulae - HNC/HCN as a diagnostic of ultraviolet irradiation

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Table 4

Molecular transitions detected.

Molecule	Transition	ν (GHz)

CO	J = 1 → 0	115.2712018

	J = 2 → 1	230.5380000

¹³CO	J = 1 → 0	110.2013543^*

	J = 2 → 1	220.3986842^*

C¹⁷O	J = 1 → 0	112.3587770^*

	J = 2 → 1	224.7141870^*

HCN	J = 1 → 0	88.6316022^*

HNC	J = 1 → 0	90.6635680

CN	N = 1 → 0	113.1441573

		113.1704915

		113.1912787

		113.4909702

	N = 2 → 1	226.6595584^*

		226.8747813^*

HCO⁺	J = 1 → 0	89.1885247

N₂H⁺	J = 1 → 0	93.1747000^*

CO⁺	J = 2 → 1	235.7896410

		236.0625530

Notes.Values of frequencies of hyperfine transitions obtained from the CDMS database. Line frequencies were measured in the laboratory by Müller et al. (2001), with updated catalog by Müller et al. (2005). Asterisks indicate frequencies representative of hyperfine transition complexes.

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