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tip is oscillated at a resonance
frequency, in tapping mode, and
intermittently contacts the surface. When
IR wavelength matches the material
absorption bands, rapid, pulsed,
thermal expansion occurs.
High speed, pulsed, tuneable
IR laser light is focused onto
the sample at the AFM
The laser pulse rate is tuned
to match the characteristics
of the AFM cantilever.
This photothermal expansion, due to sample
absorption, causes an increase in amplitude at
an alternate oscillation mode of the cantilever.
A local infrared spectrum of the sample is generated
by monitoring the cantilever amplitude as the laser
wavelength is swept across the full range.