Table 1 Nuclear spin configurations and symmetry restrictions for the rotational projection quantum numbers Ka and Kc of the D2H+ ion

From: Electron recombination of rotationally cold D2H+ ions

Configuration

Ortho (12)

Para (6)

D symmetry

A1

B2

Nuclear spin

ID = 0(1)

ID = 1(3)

 

ID = 2(5)

 

H symmetry

A1

A1

Nuclear spin

IH = 1/2(2)

IH = 1/2(2)

Rot. quantum numbers

Ka + Kc even

Ka + Kc odd

  1. The nuclear spin ID of the deuteron pair and the nuclear spin of the proton IH are considered separately, since hyperfine interactions are expected to be negligible here. The numbers in parentheses give the multiplicities.
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