Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Calculated Frequencies for C₄H₄O₂ (2-Oxetanone, 4-methylene-) ¹A C₁

mPW1PW91/6-31G(2df,p) ¹A C1

Unscaled Zero Point Vibrational Energy (zpe) 16102 cm^-1
Scaled (by 0.9547) Zero Point Vibrational Energy (zpe) 15373 cm^-1

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.

List of Irreducible Representations for C₁