Support for different molecules from HITRAN

[EkulRF]

🔖 Feature description

Support for additional molecules found in the Hitran database (particularly acetone, please).

(There may be a good reason they're not there already, please ignore if that's the case!!!)

👉 Why you want this feature!!

I've found Radis very helpful in my work but an expanded list of supported common organic compounds would really help me.

[erwanp]

Hello @EkulRF , thanks for reaching out.

RADIS is up-to-date with HITRAN; i.e. all molecules there should be accessible.
Are you sure Acetone is supported by HITRAN ? I can't find it in the Line-by-line list https://hitran.org/lbl/

Maybe you are refering to Absorption cross-sections (https://hitran.org/xsc/)

In this case unfortunately we currently do not fetch absorption cross-sections... but it's a rather easy implementation.

[EkulRF]

Hi @erwanp, thanks so much for this!

Ah yes, this explains why certain chemicals aren't here, thanks for clearing that up!

I am primarily interested in absorption cross-sections, so if Radis could do this then that would be great! If this is something I can help with wrt implementation, let me know. Otherwise, if there's a work around you could suggest, I'd be super grateful.

[erwanp]

Done in #630 ; you might want to have a look at the changes. Feedback welcome. https://github.com/radis/radis/pull/630/files

Note that this won't auto-download data at this time (you still have to login on the HITRAN website ) , but you can parse and generate Spectrum objects (and therfeore merge; rescale; etc.) directly from Hitran cross sections

[erwanp]

(hello @EkulRF , re-opening until the PR is actually merged in the develop branch. it will be closed automatically)