Coupled-cluster calculation of the static polarisabilities and hyperpolarisabilities of magnesium
Abstract
The dipole and the quadrupole polarisabilities, the dipole-dipole-quadrupole and second dipole hyperpolarisabilities of the magnesium atom are calculated with an extensive basis set by using the coupled-cluster model within the finite-field approximation. At the highest level, the single-reference coupled-cluster double-excitation model corrected to include contributions of single and triple excitations in the so-called CCD+ST(CCD) scheme, the results are 70.89, 810.0, -8.02×10 3 and 1.00×10 5 a.u., respectively, in good agreement with previous single-reference low-order perturbation theory results.
- Publication:
-
Physics Letters A
- Pub Date:
- May 1993
- DOI:
- 10.1016/0375-9601(93)90324-S
- Bibcode:
- 1993PhLA..176..105C