Why does glass not permit long wavelength infrared to pass through?

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Discussion Overview

The discussion centers on the question of why glass does not allow long wavelength infrared radiation to pass through, exploring the underlying physical principles and properties of materials involved. The scope includes theoretical considerations, material properties, and references to solid state physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the need for classical explanations versus quantum theory in understanding the behavior of glass with long wavelength infrared.
  • Another participant emphasizes the importance of the material properties, suggesting that knowledge of solid state physics is necessary to explain the phenomenon.
  • It is noted that certain types of glass, specifically fused silica, can transmit long wavelength infrared, indicating variability in material properties.
  • A request for information about the properties of fused silica is made, indicating interest in understanding its specific characteristics.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of classical versus quantum explanations, and while there is acknowledgment that certain glasses can transmit infrared, the discussion remains unresolved regarding the broader principles at play.

Contextual Notes

Limitations include a lack of detailed exploration into the specific mechanisms by which different types of glass interact with infrared radiation, as well as the dependence on definitions of "glass" and "long wavelength infrared."

quantum123
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Why does glass not permit long wavelength infrared to pass through?
 
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Certain glass (fused silica) can!

You might want to start by reading the FAQ in the General Physics forum. The entry on photon speed through a solid might be relevant.

Zz.
 
So there is no classical explanations but you need to invoke quantum theory?
 
No, you need to invoke the property of the material! And that will require knowledge of solid state physics.

Zz.
 
ZapperZ said:
Certain glass (fused silica) can!

You might want to start by reading the FAQ in the General Physics forum. The entry on photon speed through a solid might be relevant.

Zz.
can give me an idea about the properties of fused silica
 

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