Q.
What is microwave spectroscopy?
Ans.
The spectroscopy in the microwave region (100pm 11cm) is concerned with the
study of rotating molecules. Since it is concerned with the pure rotational
motion of molecules it is also known as rotational spectroscopy.
Q. Which
types of molecules give rotational spectra?
Ans.
All molecules having a permanent dipole moment are said to be microwave active;
Thus interaction can occur for such molecules, energy can be absorbed or
emitted, and the rotation gives rise to a spectrum e.g. CHCI3, HCl, etc
Q.
Which molecules are microwave inactive?
Ans.
Those molecules which do not possess any resultant dipole moment are called
microwave inactive. No interaction is possible for such molecules, e.g. H2, CI2 etc.
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