A molecular beam study of the (0,0)A2Π←X2Σ+ band of CaF isotopologues

Abstract

This study presents an experimental determination of spectroscopic parameters for the less-abundant isotopologues ⁴²CaF and ⁴⁴CaF, alongside ⁴⁰CaF, by high resolution laser-induced fluorescence spectroscopy in a skimmed free jet expansion. We recorded spectra near the natural linewidth limit and derived spectroscopic constants for both $X^2{\Sigma }^{+}$ and $A^2\Pi$ states, including the fine and ¹⁹F magnetic hyperfine parameters. We also estimated the r(⁴⁴Ca/⁴⁰Ca) isotope amount ratio, demonstrating the potential use of optical spectroscopy for isotope analysis.