We do have intensities! But only for HF and only if your Psi4 is less than a month old. So practically speaking, @jmisiewicz was spot on.
One of these days, the the Avogadro2 fellow and I really will get coordinated and hook up psi’s vib output to a visualizer. In the meantime, all we can do is provide a nice data structure. https://github.com/psi4/psi4/blob/master/psi4/driver/qcdb/vib.py#L337-L367 is what’s in frequency analysis in the below snippet
e, wfn = psi4.frequencies('mp2/cc-pvdz', return_wfn=True)
vibdata = wfn.frequency_analysis