Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model

Details Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.5401b&link_type=abstract

American Astronomical Society, DPS meeting #31, #54.01

Statistics

Computation

Scientific paper

We have computed collision-induced rotovibrational (RV CIA) absorption spectra in the near-infrared (NIR) spectral range of hydrogen-hydrogen complex. The absorption by H_2-H_2 pairs in NIR is due to the second vibrational overtone and peaks at the wavelength region between 0.77 and 0.86 mu m. Both single (H_2(Delta v=3)--H_2(Delta v=0) and double (H_2(Delta v=2)--H_2(Delta v=1) vibrational transitions are included in the calculations. We have fitted the experimental data of the second overtone of H_2--H_2 by a series of simple analytical three parameter functions. The parameters were adjusted to represent closely within few percent (and experimental errors) the existing measurement at 77 K [1]. Thereafter, their temperature dependence was forced to follow closely the theoretical, quantum mechanical computations by Fu et al. [2]. The model obtained in this way does represent the experimental data at 300 K also within few percent. This approach allows to obtain reliable RV CIA spectra of hydrogen pairs in (3-0) band at any temperature within a broad temperature range. The new model [3] assumes that both hydrogen molecules are initially in their ground vibrational states, therefore is suitable for low temperatures only, e.g. 50 to 500 K. It is especially valuable for studying the Uranus and Neptune atmospheres. The model can be used to calculate spectra for any ortho-to-para hydrogen ratio. Fortran program is available at www.astro.ku.dk/ ~ aborysow/programs/ and can be used freely provided reference to the original paper describing the method [3] is given. The authors acknowledge support from NASA, Division for Planetary Atmospheres, Grant NAG5-4534. [3mm] 1. C. Brodbeck, J.-P. Bouanich, Nguyen-Van-Thanh, Y. Fu and A. Borysow, J. Chem. Phys., 110, 4750, (1999) 2. Y. Fu, C. Zheng and A. Borysow, JQSRT, (1999), in press 3. A. Borysow, J. Borysow and Y. Fu, Icarus, (1999), submitted

Affiliated with

Also associated with

No associations

Rating

Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collision-Induced Absorption Spectra of H_2-H_2 Pairs in the Second Overtone (3-0) Hydrogen Band at Temperatures 50 to 500 K: New Semi-empirical Model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1557461