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Microwave (Rotational) Spectroscopy

Microwave (Rotational) Spectroscopy Prof. Tarek A. Fayed Microwave Spectroscopy It is concerned with transitions between rotational energy levels in the molecules, the molecule gives a rotational spectrum only If it has a permanent dipole moment: A B+ B+ A Rotating molecule H-Cl, and C=O give rotational spectrum ( Microwave active). H-H and Cl-Cl don't give rotational spectrum ( Microwave inactive). Which of the following molecules would show rotational spectrum: Br2 , HBr and CS2? Why? Rotational Spectroscopy is only really practical in the gas phase where the rotational motion is quantized.

From microwave spectroscopy, bond lengths can be determined with a correspondingly high precision, as illustrated in this example. From the rotational microwave spectrum 35of 1H Cl, we find that B = 10.59342 cm-1. Given that 35the masses of 1H and Cl are 1.0078250 and 34.9688527 amu, respectively, determine the bond

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