National Institute of Standards and Technology

Computational Chemistry Comparison and Benchmark DataBase
Release 22	May 2022
NIST Standard Reference Database 101

I	Introduction
II	Experimental data
III	Calculated data
IV	Data comparisons
V	Cost comparisons
VI	Input and output files
VII	Tutorials and Units
VIII	Links to other sites
IX	Feedback
X	Older CCCBDB versions
XII	Geometries
XIII	Vibrations
XIV	Reaction data
XV	Entropy data
XVI	Bibliographic data
XVII	Ion data
XVIII	Bad calculations
XIX	Index of properties
XX	H-bond dimers
XXI	Oddities

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IV.D.3.a. (XVIII.A.3.)

Species with point groups that differ from experiment at CCSD(T)/aug-cc-pVTZ

		Point group
Species	Name	Experimental	Calculated
C2H4+	Ethylene cation	D2h	D2
HCN-	Hydrogen cyanide anion	Cs	C∞v
NH3NH3	Ammonia Dimer	C2h	Cs
NH3NH3	Ammonia Dimer	C2h	Cs
CH3CHO	Acetaldehyde	Cs	C1
CH3CHO+	acetaldehyde cation	Cs	C1
Br3-	tribromide anion	D∞h	C2v
HCONHCH3	N-methylformamide	Cs	C1
CH2ClCH2OH2+	2-chloroethanol, protonated	C1	Cs