H₂−, He − and CO₂−line broadening coefficients and pressure shifts for the HITRAN database

To increase the potential of the HITRAN database in astronomy, experimental and theoretical line broadening coefficients and line shifts of molecules of planetary interest broadened by H₂,He,and CO₂ have been assembled from available peer-reviewed sources. Since H₂ and He are major constituents in the atmospheres of gas giants, and CO₂ predominates in atmospheres of some rocky planets with volcanic activity, these spectroscopic data are important for studying planetary atmospheres. The collected data were used to create semi-empirical models for complete data sets from the microwave to the UV part of the spectrum of the studied molecules. The presented work will help identify the need for further investigations of broadening and shifting of spectral lines.