Hyperfine structure constants for singly-ionized manganese (Mn II) using Fourier Transform Spectroscopy.

Area of Science:

• Atomic Physics
• Spectroscopy
• Quantum Mechanics

Background:

• Building upon the foundational work of Holt et al. (1999) on manganese ion (Mn II) hyperfine structure (HFS).
• Addressing the need for more precise hyperfine magnetic dipole constants (A) in atomic databases.
• Previous measurements by Holt et al. (1999) and Blackwell-Whitehead et al. (2005b) provide a basis for comparison.

Purpose of the Study:

• To expand the understanding of hyperfine structure (HFS) in Mn II.
• To verify existing hyperfine magnetic dipole constants (A) for 20 Mn II energy levels.
• To derive new A constants for 47 previously unstudied Mn II energy levels.

Main Methods:

• Analysis of archival Fourier transform (FT) spectra obtained from Imperial College London and the National Institute of Standards and Technology.
• Utilizing the XGREMLIN software package for the detailed analysis of FT spectra.
• Measurement and calculation of hyperfine magnetic dipole constants (A) from observed HFS patterns.

Main Results:

• Successful verification of hyperfine magnetic dipole constants (A) for 20 previously studied Mn II levels.
• Derivation of A constants for 47 previously unstudied Mn II levels, significantly expanding the available data.
• Achieved a ground level A constant with an uncertainty six times lower than previously reported by Blackwell-Whitehead et al. (2005b).

Conclusions:

• The study successfully expands the knowledge of Mn II hyperfine structure.
• The derived hyperfine magnetic dipole constants (A) offer improved accuracy, particularly for the ground level.
• These findings contribute valuable, high-precision atomic data for astrophysical and fundamental physics applications.