Energy and fine structure of 1s2np (n≤9) states for lithium-like systems from Z=11 to 20

• 来源期刊: 中国物理(英文版)
• 关键词: lithium-like system full-core plus correlation excitation energy fine structure
• 年，卷（期）: 2004,（5）
• 页码范围: 662-669
• 页数: 8页
• 语种: 英文

摘要

A new variation method is extended to study the atomic systems with higher nuclear charges and in more highly excited states. The non-relativistic energies of 1s2np (n ≤ 9) states for the lithium-like systems from Z=11 to 20 are calculated using a full-core-plus-correlation method with multi-configuration interaction wavefunctions. Relativistic and mass-polarization effects on the energy are calculated as the first-order perturbation corrections. The fine structures are determined from the expectation values of spin-orbit and spin-other-orbit interaction operators in the Pauli-Breit approximation. The quantum-electrodynamics correction is also included. Our results are compared with experimental data in the literature.