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Bond Length differences between FULL (all electrons correlated) and FROZEN core

Such as MP2=Frozen and MP2=Full
17 10 27 16 27

For NH+ atoms 1 and 2

For NH+ (imidogen cation)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
6-31+G**
Moller Plesset perturbation MP3=FULL -0.0001
6-31+G**

nhq1.gif