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Applied Spectroscopy front cover: kHz-resolution experimental spectroscopy

December 7, 2022

Although the field of gas phase rotational spectroscopy is mature and millions of rotational spectral lines have been measured in hundreds of molecules with sub-MHz accuracy, it remains a challenge to measure these rotational spectra in excited vibrational modes with the same accuracy. Based on the recently demonstrated quantum cascade laser (QCL) pumped molecular laser (QPML) we demonstrate how an infrared QCL may be used to enhance absorption strength or induce lasing of terahertz rotational transitions in highly excited vibrational modes in order to measure their frequencies more...

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