III.G.10.b.

Bond Length differences between CCSD(T) (frozen core) and CCSD(T)=FULL (all electrons correlated)

Choose the bonds for H2CO- (formaldehyde anion)

Species	Name	Level
H₂CO^-	formaldehyde anion	HF/6-31G*

Select two atoms.
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atom number	atom type	atom number
1	O	1
2	C	2
3	H	3
4	H	4