I'm looking for some raw data for the transmission through the air in my lab, specifically in the MIR region.
I've found a lot of data online that gives transmission vs wavelength, but the units for transmission are rarely given, and it's unclear to me if they mean transmission through the whole atmosphere (which would include air of varying absorption coefficients due to the thinner air at increased altitude).
Absorption cross section data would also be fine. But then I'd need atomic number density, which would be another challenge to find. Bonus points for data like this for individual gases that make up the atmosphere as well (especially H2O and CO2)! Thanks for any answers or advice!
Have you had a look at the spectroscopic databases of HITRAN, ExoMol, or GEISA? These databases provide absorption cross-sections for different trace gas species as a function of wavelength (or wavenumber). For HITRAN you have to calculate the cross-sections from the line intensities assuming a profile shape (e.g. a Voigt shape). If you are not familiar with calculating the absorption cross-sections from line intensities, I suggest you to use the data base of ExoMol, where the cross-sections have been already calculated (e.g. CO2 and H2O).
Thank you so so much! ExoMol is exactly what I was hoping for!
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