A Hund's Case (a) Analysis of the

Area of Science:

• Molecular spectroscopy
• Quantum chemistry
• Chemical physics

Background:

• Cobalt monofluoride (CoF) is a diatomic molecule with complex electronic structure.
• Previous studies have provided limited data on CoF's electronic transitions.

Purpose of the Study:

• To characterize a newly observed electronic subband in the CoF spectrum.
• To perform a detailed rotational analysis and electronic state identification.
• To compare CoF's spectroscopic properties with related molecules like CoH and Co(+).

Main Methods:

• Observation of electronic spectra near 513 nm.
• Rotational analysis of spectral subbands.
• Application of Hund's case (a) analysis for electronic transition characterization.
• Comparison of spectroscopic constants and electronic states with analogous species.

Main Results:

• Identification of a weak (3)Phi(3)-X(3)Phi(4) subband with DeltaSigma=-1 and DeltaOmega=-1.
• Determination of spectroscopic constants for the [18.8](3)Phi(i)-X(3)Phi(i) transition.
• Identification of two excited (3)Phi electronic state vibrational progressions.
• Assignment of K(3)Phi(i)-X(3)Phi(i) and L(3)Phi(i)-X(3)Phi(i) transitions based on spectral data and comparisons.

Conclusions:

• The study provides critical data for understanding the electronic states of CoF.
• The identified transitions and constants offer insights into molecular structure and bonding.
• Comparative analysis with CoH and Co(+) enhances understanding of trends in transition metal monohalides.