Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature

Terahertz time-domain spectroscopy has been used to measure the absorption of water vapor in 0.2–2.4 T Hz range from low to high humidity at room temperature. The observed absorption lines are due to the water molecular rotations in the ground vibrational state. We find that the absorption strength of para transitions increases as humidity increases, while the absorption strength of ortho transitions increases and then decreases in intensity with increasing humidity. We explain this difference based on the nuclear spin statistics based ratio of ortho to para water monomer populations at room temperature. The preferential adsorption on the solid surfaces of para water leads to an ortho dominated vapor cloud whose monomer rotational absorption intensity decreases due to the effects of dimerization, molecular collisions, clustering, and interactions with liquid droplets at high concentrations.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature. Journal of Applied Physics 100, 9 (2006)] and may be found at https://doi.org/10.1063/1.2357412.

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Work Title Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature
Access
Open Access
Creators
  1. Xuying Xin
  2. H. Altan
  3. D. Matten
  4. R. R. Alfano
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Journal of Applied Physics
Publication Date November 8, 2006
Publisher Identifier (DOI)
  1. https://doi.org/10.1063/1.2357412
Deposited January 22, 2024

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Version 1
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  • Created
  • Added Xuying_JAP_2006-2.pdf
  • Added Creator Xuying Xin
  • Added Creator Robert R. Alfano
  • Published
  • Updated Subtitle Show Changes
    Subtitle
    • J. Appl. Phys. 100, 094905 (2006); https://doi.org/10.1063/1.2357412
  • Renamed Creator R. R. Alfano Show Changes
    • Robert R. Alfano
    • R. R. Alfano
  • Added Creator H. Altan
  • Added Creator D. Matten
  • Updated