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The instrument is based on an AFM, in which a standard tip is vertically vibrating at the resonance frequency of the cantilever.

The AFM tip will be illuminated with a DFG mid-infrared continuum laser with ~ 350 cm-1 spectral bandwidth and tunable central frequency (1200 -1600 cm-1), inducing a wide range mid-IR source

(1000-1800 cm-1).

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