Pure rotational transitions of H2O molecules in the 8-14 micron atmospheric window

Details Pure rotational transitions of H2O molecules in the 8-14 micron atmospheric window Pure rotational transitions of H2O molecules in the 8-14 micron atmospheric window

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985infph..25..491h&link_type=abstract

(European Physical Society, International Conference on Infrared Physics, 3rd, Zurich, Switzerland, July 23-27, 1984) Infrared P

Physics

6

Atmospheric Attenuation, Atmospheric Windows, Electron Transitions, Infrared Windows, Molecular Rotation, Water Vapor, Carbon Dioxide Lasers, Line Spectra, Temperature Dependence

Scientific paper

The paper reports on the temperature dependence of the water-vapor line absorption near four different CO2-laser wavelengths at temperatures between 280 and 305 K. The measurements on mixtures of water vapor with N2 have been performed by photoacoustic techniques. The line absorptions at 10P(40), 10R(20), 9P(38), and 9R(36) are found to possess a positive temperature coefficient. On the basis of experimental and numerical studies these absorption lines are identified as weak pure rotational transitions of H2O molecules in the vibrational ground state which are superimposed on the continuum absorption. The energies of the lower rotational states are derived from regression fits of the measurements on the temperature dependence. Line strengths have been calculated on the basis of a Hamiltonian which includes centrifugal distortion up to the sixth order.

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