Empirical pair polarizability anisotropy and interatomic potential for monatomic gas mixture of Kr and Xe

Abstract

Quantum mechanical lineshapes of collision-induced light scattering (CILS) at room temperature are computed for gaseous binary mixtures of krypton with xenon using theoretical induced pair polarizability anisotropy as input. Comparison with measured anisotropic spectrum of light scattering shows good agreement, in spite of the uncertainty in its spectral moments. Empirical model of the pair polarizability anisotropy which reproduce the experimental spectrum and the first few spectral moments more closely than the fundamental theory are also given. Good agreement between computed and experinental lineshapes of scattering is obtained when potential models which are constructed from the thermophysical and total scattering cross sections are used.

Keywords:

• pair polarizability anisotropy
• interatomic potential
• krypton–xenon

Acknowledgments

I am very grateful to Dr Robert J. Le Roy for making available his published Fortran code ‘Eigenvalue program LEVEL 8.0’ for calculating eigenvalues, eigenfunctions and various matrix elements of a one-dimensional potential.