H2O and CO2 molecules tend to attenuate the infrared radiation significantly in that region. This gap is due to very strong atmospheric attenuation in that region. The MWIR region is followed by a gap that isn’t covered from 5µm to 8µm. The extended MWIR band spans from 1µm to 5µm. Adjacent to the SWIR spectral band is the midwave infrared (MWIR) band.
You may find a different segmentation of the infrared spectrum in general physics literature for that reason.
The segmentation in the above spectrum is based on the spectral sensitivity of the infrared camera sensors used for thermal infrared imaging. As the wavelengths become longer, we enter the near infrared (NIR) and shortwave infrared (SWIR) region 0.9µm to 1.7µm. That is the spectrum that we can perceive as humans with our eyes. The above illustration, from left to right, shows the visible spectrum (400nm to 700nm).
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