Rotational Spectra: Why Absorption & Not Emission Lines?

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    Rotational Spectra
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SUMMARY

The discussion centers on the predominance of absorption lines in pure rotational spectra compared to emission lines. Participants agree that absorption lines are favored due to their easier handling and the greater amount of information that can be derived from them. While both absorption and emission spectra exist, the focus remains on absorption due to its clearer intensity profiles. The conversation also touches on personal experimentation with far-infrared lasers, hinting at the existence of emission lines in specific contexts.

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koustav
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why pure rotational spectrum is almost always seen as absorption lines,and not as emission lines?
 
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koustav said:
why pure rotational spectrum is almost always seen as absorption lines,and not as emission lines?
there exists both spectra absorption and emission but

people focus on absorption as its easier to handle and more info can

be derived...the intensities are good ...see for details

Reference:< http://www.pci.tu-bs.de/aggericke/PC4e_osv/Spectroscopy050119/node18.html>
 
koustav said:
why pure rotational spectrum is almost always seen as absorption lines,and not as emission lines
That's probably because people are most likely to look into the absorption lines.
However, at one point I was playing with a far-infrared laser. I didn't make much progress but I believe, these were emission lines of rotational spectra
 

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