High School Absorption bands of liquid and vapor water

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Water vapor exists at a higher energy state than liquid water, raising questions about the differences in their absorption bands. The discussion focuses on infrared absorption bands, with an emphasis on how the hydrogen bonding in liquid water might lead to stronger absorption compared to vapor. It is suggested that the greater number of hydrogen bonds in liquid water could result in distinct absorption characteristics. Participants express curiosity about the specific absorption bands and their implications. Overall, the relationship between the state of water and its absorption properties remains a key point of inquiry.
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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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I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...

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