| Autor: |
M.S.A. El-Kader, S.I. Moustafa |
| Rok vydání: |
2005 |
| Předmět: |
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| Zdroj: |
Chemical Physics. 318:199-206 |
| ISSN: |
0301-0104 |
| DOI: |
10.1016/j.chemphys.2005.06.009 |
| Popis: |
The anisotropic rototranslational scattering spectra of nitrogen gas at high frequency up to 700 cm −1 for several temperatures and from low densities are analyzed in terms of new site–site (M3SV) intermolecular potential and interaction-induced pair polarizability models, using quantum spectral shapes computations. Our theoretical calculations take into account multipole contributions from the mean value and anisotropy of the dipole–dipole polarizability tensor α , two independent components of the dipole–octopole polarizability tensor E and dipole–dipole–quadrupole hyperpolarizability tensor B . The high-frequency wings are discussed in terms of the collision-induced rotational Rayleigh effect and estimates for the dipole–octopole polarizability | E 4 | are obtained and checked with recent ab initio theoretical value. Good comparison is found in the frequency range 0–400 cm −1 between the theoretical and experimental spectra. When an exponential contribution [exp(− ν / ν 0 )] with ν 0 = 425 cm −1 is considered to model very short-range light scattering mechanisms at room temperature, good agreement is found over the whole frequency range. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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