Table 2.

Correlation of asymptotic atom states jar HCl^a

Atom states b		Molecular correlation	Energy (eV)
Cl, 2P°	H, 2S
H, 2S	Cl, 2P°	∑+, Π	0
	4s(3P)2P	∑−, Π	9.20
H+	+ Cl−	∑+	9.98
			10.20
		∑+ (2), ∑−, Π(2), Δ
	4s(1D)2D	∑+, Π, Δ	10.43
	4p(3P)2D°	∑−, Π, Δ	10.49
	4p(3P)2S°	∑−	10.57
	4p(1P)2P°		10.59
	4p(1D)2P°		11.69
	4p(1D)2F°	∑+, Π, Δ, Φ	11.79
	5p(3P)2D°		11.83
	4d(3P)2F	∑−, Π, Δ, Φ	12.00
			12.09

^aAsymptotic excited atom states are combined with either ground state hydrogen or chlorine atoms except for the H⁺ + Cl⁻ ion-pair state. The excited orbital is noted and the parent ion state is given in parentheses. Relative energies are given for the lowest multiplet level. Note that the dissociation energy of HCl is D₀(HCl) = 4.33 eV.

^bCorrelation states are not repeated for similar pairs of atom states. A number of levels are deleted as the density of levels increases but the positions of the Cl 4d and H(n = 3) states are given.