Sympathetic cooling of molecular ions with ultracold atoms

EPJ Techniques and Instrumentation

Table 3 Partial list of the electronic affinities of candidate molecular ions

Molecule	EA [eV]	Molecule	EA [eV]	Molecule	EA [eV]	Molecule	EA [eV]	Molecule	EA [eV]
Rb\(_{2}^{+}\)	3.5	Li\(_{2}^{+}\)	5.1	YH\(_{2}^{+}\)	6.2	TiS ⁺	7.1	NaI ⁺	7.64
Cs\(_{2}^{+}\)	3.6	SrF ⁺	5.3	HoF ⁺	6.2	GeCl ⁺	7.2	RbBr ⁺	7.7
K\(_{2}^{+}\)	4.1	SrCl ⁺	5.5	Ti\(_{2}^{+}\)	6.3	CsI ⁺	7.25	Pd\(_{2}^{+}\)	7.7
KNa ⁺	4.4	SrBr ⁺	5.5	US ⁺	6.3	SiF ⁺	7.26	C ₆H₇N⁺	7.7
KLi ⁺	4.6	SrI ⁺	5.5	ErF ⁺	6.3	GeBr ⁺	7.3	(Aniline)
BaI ⁺	4.7	CaBr ⁺	5.6	TiO ⁺	6.4	SnF ⁺	7.4	LiD ⁺	7.7
BaBr ⁺	4.8	UO ⁺	5.7	V\(_{2}^{+}\)	6.4	SnBr ⁺	7.4	CsBr ⁺	7.72
SrF ⁺	4.9	CaF ⁺	5.8	CaO ⁺	6.5	Mn\(_{2}^{+}\)	7.4	PbBr ⁺	7.8
CeO ⁺	4.9	CaH ⁺	5.9	SnCl ⁺	6.6	Si\(_{2}^{+}\)	7.4	BSi ⁺	7.8
BaF ⁺	4.9	CaCl ⁺	6	TiO ⁺	6.8	MgCl ⁺	7.5	MgF ⁺	7.8
PrO ⁺	4.9	DyF ⁺	6	BaO ⁺	6.9	PbF ⁺	7.5	N(CH\(_{3})_{3}^{+}\)	7.82
Na\(_{2}^{+}\)	4.9	TaO ⁺	6	UN ⁺	7	PbCl ⁺	7.5	(Trimethylamine)
LaO ⁺	4.9	TiH ⁺	6	InS ⁺	7	N(CH₂CH\(_{3})_{3}^{+}\)	7.5	LiH ⁺	7.85
BaCl ⁺	5.0	SrO ⁺	6.1	ZrH\(_{2}^{+}\)	7	(Triethylamine)		Cu\(_{2}^{+}\)	7.89
LiNa ⁺	5.0	ZrO ⁺	6.1	InSe ⁺	7.1	HfO ⁺	7.5	PtSi ⁺	7.9
VO ⁺	5.0	CaI ⁺	6.1	TiS ⁺	7.1	GeF ⁺	7.5	Ge₂ ⁺	7.9
NdO ⁺	5.0	UC ⁺	6.2	RbI ⁺	7.1	InTe ⁺	7.6	ZrN ⁺	7.9

Charge exchange is forbidden in collisions with a neutral atom if the molecule EA is smaller than the IP of the neutral atom. We emphasize that this is only a partial list of molecules and that the number of molecular ions that can be cooled by this technique is likely much larger. Data taken from [80–82]