Microwave Spectroscopy :
This technique is actually an extension to IR spectroscopy. Microwave region lies at the far
infra-red region of the electromagnetic spectrum and its absorption by molecules give rise to
change in the rotational energies of the molecules.
In IR spectroscopy, the molecules are subjected to changes in vibrational energies; the energy required for making changes at rotational levels is lesser than that for vibrational levels. Though the principles are same to
that of IR, the instrumentation is slightly different and it requires samples in gaseous state for
the analysis.
Its applications are limited to smaller and simpler molecules since larger
molecules will have interactions between the rotational energy levels within the molecule
through various bonds they have. Besides qualitative analysis, this technique can be applied for conformational analysis of simpler compounds (study of stereo chemistry of the compounds).
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