Odd Configurations in Singly-Ionized Copper.

Area of Science:

• Atomic Physics
• Quantum Chemistry

Background:

• Accurate theoretical models are crucial for understanding atomic spectra.
• Copper ion (Cu II) spectral data is essential for various astrophysical and plasma physics applications.

Purpose of the Study:

• To compare experimental energy levels of various Cu II configurations with theoretical calculations.
• To investigate the electrostatic interactions between different electronic configurations of Cu II.

Main Methods:

• Configuration interaction calculations were performed for Cu II.
• Experimental energy levels were compared with calculated values for configurations including 3d⁹4p, 3d⁹5p, 3d⁹6p, 3d⁸4s4p, 3d⁹4f, and 3d⁹5f.
• Explicit consideration of electrostatic interactions between specific configurations.

Main Results:

• Good agreement was observed between experimental and calculated energy levels for several Cu II configurations.
• Electrostatic interactions between the 3d⁸4s4p configuration and the 3d⁹np (n=4,5,6) configurations were explicitly calculated.
• The 3d⁹4f and 3d⁹5f configurations of Cu II were found to exhibit weak interactions with other configurations.

Conclusions:

• The theoretical model provides a reliable description of the energy levels for the studied Cu II configurations.
• The weak interaction of 3d⁹4f and 3d⁹5f configurations suggests they can be treated with less complexity in certain theoretical models.
• This work contributes to a more comprehensive understanding of Cu II atomic structure and spectral properties.