Spectrometers, from far to near infrared
Infrared absorption spectrometry
Article REF: P2850 V1
Spectrometers, from far to near infrared
Infrared absorption spectrometry

Authors : Bernard HUMBERT, Jean-Yves MEVELLEC, Jérôme GRAUSEM, Manuel DOSSOT, Cédric CARTERET

Publication date: December 10, 2012, Review date: August 23, 2023 | Lire en français

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2. Spectrometers, from far to near infrared

In 1900, Planck modelled the radiation emitted by a heated body as coming from the oscillations of the electrons making up the body. These small oscillating charges acted like small antennae, emitting radiation at frequencies greater than radio waves (IR, visible and UV) due to the confinement of electrons around atoms. The possible energy values of these small oscillators are discrete and proportional to an integer multiple of the radiation frequency:

E=mhν

with :

h
 : 
(J · s) a constant of proportionality known as Planck's constant,
...
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