Emerging Nanotechnologies for Manufacturing, 2nd Edition

81References

the radiation temporal coherence. In the FTIR technique, this relates to the measure-

ment of the frequencies of vibration of the molecular bonds. The resonant frequencies

are determined by the shape of the molecular potential energy surfaces, the masses of

the atoms and associated vibronic coupling. Procedurally, a split beam of infrared light

is typically sent though the sample dissolved in a liquid medium and at the same time

through a sample of the solvent. Both beams are alternatively recorded in the detector.

Differences between the signals are used to measure the frequencies of bond vibrations

in the sample to be analysed. ...