The magnesium paradigm in IRC +10216: Discovery of MgC4H+, MgC3N+, MgC6H+, and MgC5N+

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Table B.2.

Rotational constants for potential candidates of B1449 and B1447.

Molecule	B	D	GS	Notes
	(MHz)	(Hz)
HC₅N	1331.3327	30.1	¹Σ	^A,^B,^C,3
HC₄NC	1401.1822	32.8	¹Σ	^B,^C,⁴
HCCCNCC	1448.3	33.7	¹Σ	2
HCCNCCC	1458.1	33.2	¹Σ	2
HNC₅	1358.3		¹Σ	4
C₅N⁻	1388.8673	35.7	¹Σ	⁵
^AlCCCN	1340.7575	67.3	¹Σ	^C,6
^AlCCNC	1395.8		¹Σ	⁶
^AlCNCC	1419.7		¹Σ	⁶
^AlNCCC	1480.9		¹Σ	⁶
NaCCCN	1321.0943	101.1	¹Σ	^C,7
NaCCNC	1399.8		¹Σ	⁷
NaCNCC	1444.2		¹Σ	⁷
NaNCCC	1489.1		¹Σ	⁷
MgCCCN	1380.9975	76.70	²Σ	^A,^C,⁸
MgCCNC	1469.1/1475		²Σ	⁷,⁹
MgNCCC	1536.1/1561		²Σ	⁷,⁹
MgCNCC	1479.2		²Σ	⁷
CCMgCN	1391.7		²Σ	⁷
CCMgNC	1505.4		²Σ	⁷
MgCCCN⁻	1275.0		¹Σ	⁹
MgNCCC⁻	1414.0		¹Σ	⁹
MgCCNC⁻	1351.0		¹Σ	⁹
MgC₄H	1381.512	73.70	²Σ	^A,^C,⁸
HMgC₄	1406		²Σ	⁹
MgC₄H⁻	1281/1288	144.5	¹Σ	¹,⁹
HMgC	1420		¹Σ	⁹
MgC₄	1427		³Π	2
MgC	1463/1487		²Σ	¹⁰
SiCCCN	1414.740	58.31	²Π	^C,¹¹
SiC₃N⁺	1455.3	45.0	¹Σ	2
SiCCCC	1533.772	58.36	¹Σ	^C,¹²
SiC₄H	1415.703	56.0	²Π	^C,¹³
SiC₄H⁺	1461.6	42.0	¹Σ	2
C₄S	1519.206	48.05	³Σ	^C,¹⁴
HC₄S	1434.3255	47.00	²Π	^C,¹⁵

Notes.

Detected in IRC +10216.

Detected in TMC-1.

Rotational constants from laboratory and/or astronomical data.

Bâldea (2020)

Ab initio calculations from this work (see Appendix B for details).

Giesen et al. (2020) and references therein

⁴

Cernicharo et al. (2020a) and references therein

⁵

Cernicharo et al. (2020b).

⁶

Cabezas et al. (2014).

⁷

Cabezas et al. (2019).

⁸

Cernicharo et al. (2019b).

⁹

^Aoki (2012).

¹⁰

Redondo et al. (2003b).

¹¹

Umeki et al. (2014).

¹²

Ohishi et al. (1989), Gordon et al. (2000).

¹³

McCarthy et al. (2001).

¹⁴

Hirahara et al. (1993), Gordon et al. (2001).

¹⁵

Hirahara et al. (1994).

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