IV
.
D
.3.a. (
XVIII
.
A
.3.)
Species with point groups that differ from experiment at CCSD(T)/cc-pV(T+d)Z
Point group
Species
Name
Experimental
Calculated
SiH
3
+
silyl cation
D
3h
C
3v
MgOH
magnesium hydroxide
C
∞v
C
s
HCNO
fulminic acid
C
∞v
C
s
ONNO
NO dimer
C
2h
C
2v
C
3
O
2
Carbon suboxide
D
∞h
C
2v
