Cannot calculate radiance of N2

[TranHuuNhatHuy]

I'm using RADIS app for calculating random large spectra. I just noticed that I could not calculate N2 molecule under any conditions. Here is a condition to reproduce:

• Database: HITRAN.
• Mode: Radiance.
• Wavenumber range (cm-1): 500 to 1000, or anything you wanna try. I choose this range to cover all full-range.
• Tgas: 300 K (default)
• Pressure: 1.01325 bar (default)
• Path length: 1 cm (default)
• Molecule: N2
• Mole fraction: 0.1 (default)

Strangely, I know that RADIS app takes its back-end from main RADIS, but in this case no error logs pop up, and the calculation time is quite fast - around 1 second (the blue spinning circle indicates that the app is calculating, am I right?).

[suzil]

Server logs to help debugging this:

File already exist: /home/suzil/.radisdb/hitran/downloads__can_be_deleted/N2/N2_2.data. Deleting it.`

Data is fetched from http://hitran.org

BEGIN DOWNLOAD: N2_2
  65536 bytes written to /home/suzil/.radisdb/hitran/downloads__can_be_deleted/N2/N2_2.data
Header written to /home/suzil/.radisdb/hitran/downloads__can_be_deleted/N2/N2_2.header
END DOWNLOAD
                     Lines parsed: 161
PROCESSED
INFO:     127.0.0.1:60496 - "POST /calculate-spectrum HTTP/1.0" 200 OK

When encountering an error, we stringify the error and return it back to the client: https://github.com/suzil/radis-app/blob/main/server/main.py#L65 But in this case the error is an empty string.

@arunavabasu-03 It may be worth trying to reproduce this by directly calling radis.calc_spectrum in a script (outside of the app environment) with the same version of RADIS that the app is using. Then we can ask the RADIS team to help debug it.

[arunavabasucom]

yeah @suzil, we can do that !! :)