Molecules in Space (as of 10/2002)

2-7 atoms 8-13 atoms

Note: Deuterium isotopomers are given seperately only if their method of detection is intrinsically different from that of pure hydrogen isotopomers.

All molecules have been detected (also) by rotational spectroscopy in the radiofrequency to far-infrared regions unless indicated otherwise.
* indicates molecules that can be detected by their rotation-vibration spectrum,
** those detected by electronic spectroscopy only.
Transition metal molecules detected in atmospheres of stars by electronic spectroscopy are currently not included. Tentative detections are indicated by “?”. These include molecules for which (partial) overlap of lines cannot be ruled at the moment.

We welcome comments on this list !

2 atoms	3 atoms	4 atoms	5 atoms	6 atoms	7 atoms
H₂	C₃*	c-C₃H	C₅*	C₅H	C₆H
AlF	C₂H	l-C₃H	C₄H	l-H₂C₄	CH₂CHCN
AlCl	C₂O	C₃N	C₄Si	C₂H₄*	CH₃C₂H
C₂**	C₂S	C₃O	l-C₃H₂	CH₃CN	HC₅N
CH	CH₂	C₃S	c-C₃H₂	CH₃NC	HCOCH₃
CH<sup>+</sup>	HCN	C₂H₂*	CH₂CN	CH₃OH	NH₂CH₃
CN	HCO	CH2D⁺?	CH₄*	CH₃SH	c-C₂H₄O
CO	HCO⁺	HCCN	HC₃N	HC₃NH⁺	H<sub>2</sub>CCHOH
CO⁺	HCS⁺	HCNH⁺	HC₂NC	HC₂CHO
CP	HOC⁺	HNCO	HCOOH	NH₂CHO
CSi	H₂O	HNCS	H₂CHN	C₅N
HCl	H₂S	HOCO⁺	H₂C₂O	l-HC₄H*
KCl	HNC	H₂CO	H₂NCN
NH**	HNO	H₂CN	HNC₃
NO	MgCN	H₂CS	SiH₄*
NS	MgNC	H₃O⁺	H₂COH⁺
NaCl	N₂H⁺	NH₃
OH	N₂O	c-SiC₃
PN	NaCN	CH₃*
SO	OCS
SO⁺	SO₂
SiN	c-SiC2
SiO	CO₂*
SiS	NH₂
CS	H₃⁺
HF	H₂D⁺
SH*	SiCN
HD	AlNC
FeO
O<sub>2</sub>?
8 atoms	9 atoms	10 atoms	11 atoms	12 atoms	13 atoms
CH₃C₃N	CH₃C₄H	CH₃C₅N ?	HC₉N	C₆H₆*	HC₁₁N
HCOOCH₃	CH₃CH₂CN	(CH₃)₂CO
CH<sub>3</sub>COOH	(CH₃)₂O	(CH₂OH)₂?
C₇H	CH₃CH₂OH
H₂C₆	HC₇N
CH₂OHCHO?	C₈H
l-HC₆H*

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