L1 /
5
CH1012
IR SPECTROSCOPY II
· A covalent bond continually vibrates.
•The
frequency of a vibration must match the
frequency
of irradiation
for absorption
to occur.
frequency
of irradiation
for absorption
to occur.
• A dipole
moment must
be created by
the vibration
moment must
be created by
the vibration
•The absorption
corresponds to
a change in Evib
in the molecule.
corresponds to
a change in Evib
in the molecule.
IR Spect. = “Functional
group detector”
