Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology | |
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You are here: Calculated > Vibrations > Bad Calculations > Bad vib. Calc. vs exp. OR Resources > Bad Calculations > Vibrations > Bad vib. Calc. vs exp. |
Calculated frequencies that differ from experiment by more than 400 cm-1 or have a ratio with experiment outside of 0.7 to 1.2 are listed
Calculated vibrational frequencies ("theory" in table) are calculated at
CCSD=FULL/6-31+G**
Calculated values were scaled by 1.
Species | Name | mode | int rot | Symmetry | Experiment | Theory | difference | ratio |
---|---|---|---|---|---|---|---|---|
C2H2 | Acetylene | 4 | Πg | 612 | 496 | -116 | 1.234 | |
H2O | Water | 1 | A1 | 3657 | 2456 | -1201 | 1.489 | |
H2O | Water | 3 | B2 | 3756 | 2596 | -1160 | 1.447 |