An interesting observation
H
2
+
+ O
2+
Note that
=
0.32
0.02
~
1/3
H
2
+
+ O
+
while
Ne
3+
=
0.390
0.006
Ne
2+
Ar
3+
=
0.326
0.003
Ar
2+
CO
3+
=
0.35
0.02
CO
2+
BR seems to be a
constant fraction of H
2
O
q+
Heber
et al
. Phys. Rev. A
52
, 4578 (1995)
Ben-Itzhak
et al
. Phys. Rev. A
47
, 2827 (1993)