Publication Abstracts

Podobedov et al. 2008

Podobedov, V.B., D.F. Plusquellic, K.E. Siegrist, G.T. Fraser, Q. Ma, and R.H. Tipping, 2008: New measurements of the water vapor continuum in the region from 0.3 to 2.7 THz. J. Quant. Spectrosc. Radiat. Transfer, 109, 458-467, doi:10.1016/j.jqsrt.2007.07.005.

We present a spectroscopic study of the water vapor continuum absorption in the far-IR region from 10 to 90 /cm (0.3-2.7 THz). The experimental technique combines a temperature-stabilized multipass absorption cell, a polarizing (Martin-Puplett) interferometric spectrometer, and a liquid-He-cooled bolometer detector. The contributions to the absorbance resulting from the structureless H2O-H2O and H2O-N2 continua have been measured in the temperature range from 293 to 333 K with spectral resolution of 0.04-0.12 /cm. The resonant water vapor spectrum was modeled using the HITRAN04 database and a Van Vleck-Weisskopf lineshape function with a 100 /cm far-wing cut-off. Within experimental uncertainty, both the H2O-H2O and H2O-N2 continua demonstrate nearly quadratic dependencies of absorbance on frequency with, however, some deviation near the 2.5 THz window. The absorption coefficients of 3.83 and 0.185 (dB/km)/(kPa THz)2 were measured for self- and foreign-gas continuum, respectively. The corresponding temperature exponents were found to be 8.8 and 5.7. The theoretically predicted foreign continuum is presented and a reasonable agreement with experiment is obtained.

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BibTeX Citation

  author={Podobedov, V. B. and Plusquellic, D. F. and Siegrist, K. E. and Fraser, G. T. and Ma, Q. and Tipping, R. H.},
  title={New measurements of the water vapor continuum in the region from 0.3 to 2.7 THz},
  journal={J. Quant. Spectrosc. Radiat. Transfer},

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RIS Citation

ID  - po09100s
AU  - Podobedov, V. B.
AU  - Plusquellic, D. F.
AU  - Siegrist, K. E.
AU  - Fraser, G. T.
AU  - Ma, Q.
AU  - Tipping, R. H.
PY  - 2008
TI  - New measurements of the water vapor continuum in the region from 0.3 to 2.7 THz
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 109
SP  - 458
EP  - 467
DO  - 10.1016/j.jqsrt.2007.07.005
ER  -

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