It is advisable to get the reflection spectra but satisfactory value for individual wavelengths. If you have information about relevant absorption I will be happy to hear you here.
Values in relative terms are also welcomed.
Maybe the attached paper can help you. My Institute was Partner in this European Project.
The attached paper may be help you
Hi Denys, you can try find in local library book of Kriksunov or Gossorg (in russian) with lot of IR irradiation spectra (or just measure it ).
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