Notes. The scaling factors from the AMES PAH database (${\mathrm{S}\mathrm{F}}_3^{\mathrm{A}\mathrm{M}\mathrm{E}\mathrm{S}}$) are compared to those from this work: 6-31+G(d)/B3LYP $\left({\mathrm{S}\mathrm{F}}_3^{\text{B3LYP}}\right)$ and 6-31+G(d)/B3LYP+GD3 (${\mathrm{S}\mathrm{F}}_3^{\mathrm{D}3}$). The maximum relative errors (Max.r.e) of the scaled frequencies are also included for both ${\mathrm{S}\mathrm{F}}_3^{\text{B3LYP}}$ and ${\mathrm{S}\mathrm{F}}_3^{\mathrm{D}3}$. The specific frequency (or wavelength) range of harmonic frequencies for each scaling factor in this work $({\mathrm{S}\mathrm{F}}_3^{\mathrm{B}3\mathrm{L}\mathrm{Y}\mathrm{P}},{\mathrm{S}\mathrm{F}}_3^{\mathrm{D}3})$ is according to the standard range set proposed by Zapata Trujillo & McKemmish (2022a,b). The wavelength ranges are highlighted for indene (In) as an example: ^(a)> 10 μm, ^(b)5–10 μm, ^(c)<5 μm. Max.r.e was computed using wavelength units.