Electronic transitions of gaseous molecules will show both vibrational and rotational fine structure.
2.
The infrared spectrum of hydrogen chloride gas shows rotational fine structure superimposed on the vibrational spectrum.
3.
Vibrational bands have rotational fine structure.
4.
The bands at shorter wavelength are overtones and combination bands, all of which show rotational fine structure.
5.
The distorted configurations sampled impart their geometrical parameters on, for example, the rotational fine structure in a spectrum.
6.
Each electronic transition may show vibrational coarse structure, and for molecules in the gas phase, rotational fine structure.
7.
The symmetric and asymmetric stretching vibrations are close to each other, so the rotational fine structures of these bands overlap.
8.
There is no rotational fine structure, but the absorption band are broader than might be expected, because of hydrogen bonding.
9.
The band around 6.3 ?m ( 1590 cm " 1 ) is due to the HOH bending vibration; the considerable breadth of this band is due to the presence of extensive rotational fine structure.
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