= Formaldehyde vibrational data in the NIST Chemistry WebBook
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{tag=Work by National Institute of Standards and Technology}
https://webbook.nist.gov/cgi/cbook.cgi?ID=C50000&Mask=800
The gas-phase fundamental entries include C=O stretch $1746$, symmetric C–H stretch $2783$, antisymmetric C–H stretch $2843$, and wag $1167\ \mathrm{cm^{-1}}$, with the $C_{2v}$ labels used in the exam. The listed fundamentals provide an independent assignment check, rather than a solution source.
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