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**I don't understand "per cm"**

Chemists seem to use the "per cm" [tex] (cm^{-1}) [/tex] scale for spectroscopy. I'm use to dealing with THz.

Can someone please point me to a resource or explain where per cm is used and how to convert between different common units??

I know you just take the wavelength, put in cm form and inverse - but I don't think its as simple as that for bandwidths...