12: Rotational Spectroscopy of CO and PH3

Experimental data for the rotational spectrum of carbon monoxide (CO) at two temperatures is available here:

The low-pressure, high resolution spectrum of phosphine, \( \mathrm{PH_3} \), in the region \( 0 -- 200\;\mathrm{cm^{-1}} \) is provided in the text file PH3-spec.txt. The line list for phosphine in this region is PH3-lines.txt.

The pure rotational spectrum of phosphine

A Jupyter Notebook with an interactive plot of the rotational energy level populations of a diatomic molecule is available: interactive-rotational-populations.zip. You can also run this Notebook in MyBinder here.