https://www.ru.nl/en/research/research-news/the-infrared-absorption-spectrum-of-phenylacetylene-and-its-deuterated-isotopologue
Researchers at FELIX and collaborators at NASA have measured the far- and mid-infrared spectrum of phenylacetylene, a molecule recently detected in space, and...
infrared absorption spectrumphenylacetylenedeuteratedisotopologue
https://www.nist.gov/publications/absorption-spectrum-noble-gases-arc-spectrum-limit
Rydberg spectral lines of an atom are sometimes superimposed on the continuous spectrum of a different configuration.
on theabsorption spectrumnoble gasesarc