The higher order Cn dispersion coefficients for the alkali atoms
J. Mitroy, M. W. J. Bromley
Abstract
The van der Waals coefficients, from C11 through to C16 resulting from 2nd, 3rd and 4th order perturbation theory are estimated for the alkali (Li, Na, K and Rb) atoms. The dispersion coefficients are also computed for all possible combinations of the alkali atoms and hydrogen. The parameters are determined from sum-rules after diagonalizing the fixed core Hamiltonian in a large basis. Comparisons of the radial dependence of the Cn/rn potentials give guidance as to the radial regions in which the various higher-order terms can be neglected. It is seen that including terms up to C10/r10 results in a dispersion interaction that is accurate to better than 1 percent whenever the inter-nuclear spacing is larger than 20 a0. This level of accuracy is mainly achieved due to the fortuitous cancellation between the repulsive (C11, C13, C15) and attractive (C12, C14, C16) dispersion forces.
Create a lesson
Related papers
Effective Conservation and Bistability of Atomic Alignment under Strong Spin~Exchange
Anton K. Vershovskii
Small-Angle Differential Cross Sections for Symmetrical Resonant Charge Exchange in Molecular Hydrogen
Jibak Mukherjee, Kamal Kumar, Harpreet Singh et al.
Observation of multiphoton entanglement in resonance fluoresce
Xiao-Long Zhou, Jian Wang, Ze-Min Shen et al.
Improved systematic uncertainty evaluation of the 171Yb optical lattice clock NMIJ-Yb1 with uncertainty of 2.6×10-17
Takumi Kobayashi, Akiko Nishiyama, Ikuhiko Saito et al.
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Three-Particle Feynman Diagram Contribution to Core-Valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Three-Particle Feynman Diagram Contribution to Valence-Valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė