Table 1: Statistical properties of the ortho and para forms of D₂ (Herzberg 1950). The ortho nuclear spin states are associated with even values of the rotational quantum number, J, and the para states with odd J. Only the lowest rotational level of each modification was included in the model. For D₂⁺ and D₂H⁺, the statistical properties of the lowest ortho and para levels are the same as in the case of D₂; but the lowest para level lies 42.0 K and 50.2 K, respectively, above the lowest ortho level, which is the ground level (Polyansky & Tennyson 1999; Ramanlal & Tennyson 2004).
Modification $I_{\rm tot}$ $\sum (2I_{\rm tot}+1)$ J (2J+1) $(2J+1)\sum (2I_{\rm tot}+1)$ E_J (K)

ortho 0, 2 6 0 1 6 0

para 1 3 1 3 9 86.0

**Table 1:** Statistical properties of the ortho and para forms of D₂ (Herzberg 1950). The ortho nuclear spin states are associated with even values of the rotational quantum number, J, and the para states with odd J. Only the lowest rotational level of each modification was included in the model. For D₂⁺ and D₂H⁺, the statistical properties of the lowest ortho and para levels are the same as in the case of D₂; but the lowest para level lies 42.0 K and 50.2 K, respectively, above the lowest ortho level, which is the ground level (Polyansky & Tennyson 1999; Ramanlal & Tennyson 2004).
Modification	$I_{\rm tot}$	$\sum (2I_{\rm tot}+1)$	J	(2J+1)	$(2J+1)\sum (2I_{\rm tot}+1)$	E_J (K)
ortho	0, 2	6	0	1	6	0
para	1	3	1	3	9	86.0

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