Absorption bands of liquid and vapor water

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SUMMARY

The discussion centers on the absorption bands of liquid and vapor water, specifically in the infrared spectrum. It is established that water vapor exists at a higher energy state than liquid water, leading to differences in absorption characteristics. The presence of more hydrogen bonds in liquid water compared to vapor is noted as a significant factor, suggesting that liquid water should exhibit stronger absorption in the infrared band due to its molecular structure.

PREREQUISITES
  • Understanding of infrared spectroscopy
  • Knowledge of molecular bonding, specifically hydrogen bonds
  • Familiarity with the physical states of water
  • Basic principles of energy states in molecular chemistry
NEXT STEPS
  • Research the specific infrared absorption bands of liquid water
  • Study the molecular structure of water and its impact on absorption characteristics
  • Explore the differences in energy states between liquid and vapor phases of substances
  • Investigate the role of hydrogen bonding in molecular absorption spectra
USEFUL FOR

Researchers in physical chemistry, environmental scientists studying atmospheric water vapor, and anyone involved in spectroscopy or molecular analysis of water.

zapnthund50
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Water vapor exists at a higher energy state than liquid water...but does that make a difference in the absorption bands? In other words, are the absorption bands of vapor and liquid water identical?

Thanks!
 
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Which absorption bands?
 
Bystander said:
Which absorption bands?
The infrared band is what I'm curious about. Also, my question was worded wrong...since liquid water has, on average, far more hydrogen bonds per molecule than water vapor, shouldn't there be an absorption difference? I would expect liquid water to absorb more strongly than vapor.
 

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