Long range interactions of the Mg+ and Ca+ ions
Faculty of Technology, Charles Darwin University, Darwin, NT, 0909, Australia
Corresponding author: a firstname.lastname@example.org
Revised: 5 October 2007
Published online: 23 November 2007
The polarizabilities of the low lying states of the Mg+ and Ca+ ions are evaluated by diagonalizing the semi-empirical Hamiltonians in a large dimension single electron basis. The quadrupole moment of the metastable 3d state Ca+ is also calculated and is within 1% of a recent experimental value while being 5% smaller than some large ab-initio calculations. In addition, the long range dispersion coefficients for these ions interacting with a number of atoms are given. Oscillator strengths are also given and generally agree with the most sophisticated ab-initio calculations. The polarizabilities and dispersion coefficients can be used to estimate the frequency shifts of the Ca+ 4s ↦ 3d clock transition due to background electric fields and also collisions with a buffer gas.
PACS: 34.20.Cf – Interatomic potentials and forces / 31.50.-x – Potential energy surfaces / 32.10.Dk – Electric and magnetic moments, polarizabilities
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007